Progress 10/01/12 to 09/30/17
Outputs
Target Audience:Maine's 510 wild blueberry growers and six grower/processors who produce 100million pounds of wild blueberries on 45,000 acres in Maine. Changes/Problems:
Nothing Reported
What opportunities for training and professional development has the project provided?Northeastern Plant Pest and Soils Conference. Philadelphia, PA. January 3-6, 2017. Applications of UAVs/Drones and LiDAR in Agriculture and Forestry. University of Maine, Presque Isle, ME June 16, 2017. How have the results been disseminated to communities of interest?Wild Blueberry Research and Extension Workers Conference. Fredericton, NB, October 19-21, 2016. Wabanaki Cultural Center and Museum. Calais, ME, November 4, 2016. Wild Blueberry Association of North America Annual Meeting, Ellsworth, ME December, 14, 2016. Northeastern Plant Pest and Soils Conference. Philadelphia, PA January 3-6, 2017. Augusta Agricultural Trade Show, Augusta, ME January 12, 2017. Wild Blueberry ICM Scouting Sessions. Warren, Orland and Machias, May 2,3,4,30,31 and June 1, 27, 28, 29, 2017. Wild Blueberry Spring Grower Meetings. Waldoboro, Ellsworth and Machias, ME March 21, 23, 25, 2017. Calibration Workshop for Boom and Airblast Sprayers. Union, ME April 14, 2017. MaineAg in the Classroom Kids Day 2017, Windsor, ME May 19, 2017. Organic Field Day Presentation, Northfield, ME June 22, 2017. Wild Blueberry Summer Field Day & Meeting, Jonesboro, ME July 19, 2017. Legislative Tour, Machias and Jonesboro, August 24-25, 2017. Big E, Springfield, MA, September 14 -16, 2017. American Marketing Service Tour, Jonesboro, ME September 25, 2017. What do you plan to do during the next reporting period to accomplish the goals?
Nothing Reported
Impacts
What was accomplished under these goals?
Zeus Prime XC (sulfentrazone and carfentrazone, Group 14) and Rely 280 (glufosinate, Group 10) have recently received a blueberry label but we have little information on their efficacy for weed control in wild blueberries (Vaccinium angustifolium Ait.) in Maine. In spring 2017, trials were conducted in commercial wild blueberry fields the towns of Union, Jonesboro and Wesley to encompass a range of weed and soil conditions. Treatments included an untreated check, Zeus alone, and Zeus with Rely in split treatments with hexazinone on one half; and with Rely, hexazinone, terbacil, rimsulfuron and diuron in combinations, which were not split. All sites were evaluated in June and July for wild blueberry cover and phytotoxicity and broadleaf and grass cover. Zeus application resulted in a high initial injury to wild blueberry and therefore had the lowest initial cover among treatments; the addition of Rely and/or hexazinone did not increase the damage compared to Zeus alone. By the time of the second evaluation in July this injury was not as apparent as the blueberry plants had recovered. Zeus phytotoxicity at Wesley was half that of the other sites. Wesley had the heaviest soil and highest organic matter, so it appears that on this site Zeus was tied up and so was less active. Although Wesley had less broadleaf weed control with Zeus alone compared to the other sites in combination with Velpar it was similar and far better than just the Velpar combination treatments alone. Initial overall broadleaf weed cover in Union was low, and the treatments kept it low over time. Jonesboro had more broadleaf weeds initially, and the amount of weed suppression was increase with the addition of Zeus and Rely with Velpar. In Wesley, although percent weed cover in the check was similar to Jonesboro in June and July, and the Zeus treatments responded similarly to the other sites over time, broadleaf weed cover in the Rely tank mix treatment in both June and July resulted in broadleaf weed cover that was higher than the untreated check. It may be that the Zeus rate used in this trial, 12.5 oz/a may be higher than necessary to control weeds on sandier sites. Phytotoxicity to wild blueberry was significantly lower in Wesley, indicating that some of the Zeus was being tied up in the heavier soil, but broadleaf weed control remained comparable to the other sites. This trial also confirms that soil composition can result in marked differences in weed responses when using soil applied herbicides. The heavier soil in Wesley prompted a release of broadleaf weeds in the Rely tank mix and Velpar combination treatments instead of a reduction, so the addition of Zeus is needed on sites with heavier soils in combination with products such as terbacil, hexazinone and diuron as it resulted in much better control than the use of any of these combinations alone. We have improved our understanding of these new active ingredients and are conveying to growers the proper timing and rates to use these new tools effectively control weeds without injuring wild blueberries.
Publications
- Type:
Conference Papers and Presentations
Status:
Published
Year Published:
2017
Citation:
Yarborough, D.E. and J. L. D'Appollonio. 2017. Comparisons of single versus split postemergence mesotrione applications for spreading dogbane control in wild blueberry fields. Proceeding of The Northeastern, Plant, Pest, and SoiIs Conference. Philadelphia, PA; January 3-6, 2017. No. 31.
Yarborough, D.E. and J. L. D'Appollonio. 2017 Preemergence and postemergence applications of sulfentrazone and carfentrazone for weed control in wild blueberry (Vaccinium angustifolium) fields. Proceeding of The Northeastern, Plant, Pest, and SoiIs Conference. Philadelphia, PA; January 3-6, 2017. No.113.
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Progress 10/01/15 to 09/30/16
Outputs
Target Audience:Maine's 510 wild blueberry growers and six grower/processors who produce 100million pounds of wild blueberries on 44,000 acres in Maine. Changes/Problems:
Nothing Reported
What opportunities for training and professional development has the project provided?First Annual Meeting of the Northeastern Plant, Pest, and Soils Conference, Philadelphia, PA. January 3-7, 2016. XI International Vaccinium Symposium. April 10-14, 2016, Orlando, Florida, USA. How have the results been disseminated to communities of interest?Agricultural Trade Show, Augusta, ME, January 14, 2016. 2016 WILD BLUEBERRY SPRING MEETINGS, Ellsworth, Waldoboro, Machias, March 22, 24, 26, 2016. ICM Scouting Sessions, Warren, Jonesboro, Orland on April 26,27,29; May 24,25,26; June 28,29,30, 2016. Wild Blueberry Summer Field Day & Meeting, Jonesboro, ME July 20, 2016. What do you plan to do during the next reporting period to accomplish the goals?Agricultural Trade Show, Augusta, ME, January 2017. 2016 WILD BLUEBERRY SPRING MEETINGS, Ellsworth, Waldoboro, Machias, March 21, 23, 25, 2017. ICM Scouting Sessions, Warren, Jonesboro, Orland on April, May, andJune 2017. Wild Blueberry Summer Field Day & Meeting, Jonesboro, ME July 19, 2017.
Impacts
What was accomplished under these goals?
Zeus Prime XC (carfentrazone+sulfentrazone) is a product which has blueberry on the label but has not been tested in wild blueberries (Vaccinium angustifolium Ait.). Since no Group 14 products are registered for wild blueberry, Zeus can contribute to a weed resistance management program. Zeus was evaluated at different rates and timings on two pruned fields in Jonesboro and Wesley, ME. A Randomized Complete Split Block Design (four replications) was split with hexazinone (Velpar) applied pre-emergence 1 lb/a to half of each block. Treatments included: untreated check; Zeus 7.7 oz/a pre-emergence (Zeus Low); Zeus 12.5 oz/a pre-emergence (Zeus Mid); Zeus 15.2 oz/a pre-emergence (Zeus High); Zeus 7.7 oz/a pre-emergence plus Zeus 7.5 oz/a post-emergence in November (Zeus pre+fall); Zeus 7.7 oz/a pre-emergence plus rimsulfuron (Solida) 4 oz/a pre-emergence (Zeus+Solida pre); Zeus 7.7 oz/ pre-emergence plus Solida 4 oz/a post-emergence (Zeus pre+Solida post); and carfentrazone (Aim) 2 oz/a pre-emergence plus Solida 4 oz/a post-emergence (Aim+Solida). Sites were evaluated in June and August. Treatments were compared to each other with Velpar treatments and no-Velpar treatments analyzed separately. Velpar vs no-Velpar for each main treatment and Zeus alone or with Velpar at four rates were compared on broadleaf and grass cover. Significant relationships of the latter were analyzed by regression. Phytotoxicity to wild blueberry was observed mainly as stunting and was observed with the Solida applications and with Aim. Aim+Solida controlled broadleaf weeds including problem weeds such as red sorrel (Rumex acetosella L.) and bladder campion (Silene vulgaris (Moench) Garcke), but with more injury to wild blueberry. Broadleaf weed control by Zeus released grasses, and the low Zeus rate did not control grasses well. In Wesley grass cover was primarily witchgrass (Panicum capillare L.), a later germinating species. Higher phytotoxicity expressed as stunting of the wild blueberry produced more grasses and the blueberry plants did not fill in as quickly or grow as tall as untreated. Zeus pre+Solida post Velpar vs no-Velpar treatments had comparable phytotoxicity and no-Velpar had more broadleaf weeds in June. Neither treatment had grasses in June but Velpar had more grasses in August. The early season broadleaf weeds delayed filling in of the wild blueberry canopy. For grass cover in Wesley for Zeus Mid and Zeus pre+Solida post, the difference does not appear due to August broadleaf weed cover, as Velpar vs no-Velpar was roughly equal. It is more likely due to Velpar controlling broadleaf weeds early in the season, which resulted in more favorable conditions for germinating grasses. A quadratic relationship found in Jonesboro for the Zeus rate on broadleaf weed cover suggests a diminishing return for the higher rates from injury to the wild blueberry plants or release of other weeds. The regression analyses for increasing rates of Zeus on weed cover are not strong and should not be considered definitive. The overall lack of significant relationships found are attributed to the lack of replication and field variability, so future trials will employ fewer treatments and increased replication.
Publications
- Type:
Conference Papers and Presentations
Status:
Published
Year Published:
2016
Citation:
Yarborough, D.E. and J.L. Cote. 2016. Evaluation of fall and spring applications of herbicides targeting resistant weeds in wild blueberry fields. Proceedings of the First Annual Meeting of the Northeastern Plant, Pest, and Soils Conference. Pg 125.
- Type:
Conference Papers and Presentations
Status:
Published
Year Published:
2016
Citation:
Single vs split applications of post-emergence herbicides for spreading dogbane (Apocynum androsaefolium) control in wild blueberry fields. Proceedings of the First Annual Meeting of the Northeastern Plant, Pest, and Soils Conference. Pg 84
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Progress 10/01/14 to 09/30/15
Outputs
Target Audience:Maine's 510 wild blueberry growers and six grower/processors who produce 90 million pounds of wild blueberries on 45,000 acres in Maine. Changes/Problems:
Nothing Reported
What opportunities for training and professional development has the project provided?Northeastern Weed Science Society Annual Meeting, Williamsburg, VA, January 5-8, 2015. How have the results been disseminated to communities of interest? Augusta Agricultural Trade Show, Augusta, ME January 15, 2015. Wild Blueberry Spring Grower Conference, Bangor, ME March 20, 2015. ICM Scouting Sessions, Warren, Jonesboro, Orland on April 28,29,39; May 26,27,28; June 30, July 1,2, 2015. Organic Field Day Presentation, Penobscot, ME, July 7, 2015. Wild Blueberry Summer Field Day & Meeting, Jonesboro, ME July 15, 2015. Legislative Tour, Machias and Jonesboro, August 21-22, 2015. Maine Board of Pesticides Control at Blueberry Hill Farm, Jonesboro, August 27, 2015. Maine Development Foundation Tour, Cherryfield, ME, October 8, 2015. Wild Blueberry Research and Extension Workers Conference. Bar Harbor, ME, October 22, 2015. Wild Blueberry Association of North America Annual Meeting. Bar Harbor, ME, October 23, 2015. What do you plan to do during the next reporting period to accomplish the goals? 70th Meeting Northeastern Weed Science Society in Philadelphia, PA Agricultural Trade Show, Augusta, ME Spring grower meetings in Waldoboto, Ellsworth and Machias, ME Annual Wild Blueberry Field Day, Jonesboro, ME Integrated Crop Management Field Training Sessions in Warren, Orland and Jonesboro, ME Wild Blueberry Association of North America and Wild Blueberry Research and Extension Workers Annual Meeting, Fredricton, NB
Impacts
What was accomplished under these goals?
Several herbicides, both registered and unregistered, are currently under review for use on wild blueberry. Indaziflam (6.5 oz/a), flumioxazin (12 oz/a), halosulfuron (1 oz/a) and isoxaben (1.33 lb/a) are pre-emergence herbicides, while rimsulfuron (4 oz/a) may be used pre- or post-emergence. We treated an established weed, red sorrel (Rumex acetosella), and a newly emerging weed, horseweed (Conyza canadensis). Red sorrel is resistant to several herbicides, competes with blueberry, and hinders harvest. The treatments were applied to red sorrel on ten 1-m2 plots on 14 May 2015 and five of the plots were treated by the grower with hexazinone (0.4 gal/a). Wild blueberry and red sorrel cover and phytotoxicity, as well as % cover broadleaf weeds and grasses, were evaluated in June and September. The treatments were applied horseweed on ten 1-m2 plots on 11 November 2014 except flumioxazin applied on 11/26; five plots were also treated by the grower with hexazinone (6.6 pt/a) and diuron (1.6 qt/a, 5/12/15), and mesotrione (3 oz/a, 6/16/15). Effects on wild blueberry cover and phytotoxicity, horseweed and broadleaf weed and grass cover were evaluated in June and July. Horseweed phytotoxicity was not rated as the plants were either dead or unaffected. Data were analyzed using Tukey's tests to determine significant differences (α=0.05). There were no significant differences in wild blueberry cover in the red sorrel trial at either evaluation. Phytotoxicity was initially highest with halosulfuron and was significantly higher than all other treatments except rimsulfuron alone, with no differences in phytotoxicity by September. Although there were initially no differences in red sorrel cover; phytotoxicity was highest in the flumioxazin-grower treatment and was significantly higher compared to the check and other herbicides. In September, red sorrel cover was almost eliminated in the grower-treatments. Weed cover was 0-14% cover overall, and there were no differences in broadleaf or grass cover. Wild blueberry cover in the horseweed trial was low because the horseweed occurred in bare spots at this site. There were no significant differences in blueberry cover and no phytotoxicity for the treatments alone in June, but phytotoxicity occurred in the flumioxazin treatment in July. The grower-treatments resulted in minor phytotoxicity in June in the rimsulfuron treatment, which was only significantly higher than flumioxazin treatment. However, there was significant phytotoxicity in the grower-treatments in July from the grower's mesotrione post-emergence treatment. At the June evaluation, horseweed cover was significantly lower in the rimsulfuron treatment compared to the other treatments alone; by July, rimsulfuron remained lowest but was no longer significantly different. There was no horseweed in the grower-treatment plots at either evaluation. Broadleaf weed and grass cover were low in this trial as well with no differences in broadleaf weed cover at either evaluation. Grass cover was highest in June on the halosulfuron treatment and was significantly higher than flumioxazin and all grower-treatments. In July, grass cover in the halosulfuron treatment almost doubled and was significantly higher than the other treatments, plus indaziflam alone. The addition of indaziflam and flumioxazin improved the effectiveness of red sorrel control when combined with hexazinone and should be evaluated further. Also, fall timing applications of indaziflam and flumioxazin in the prune year should be evaluated to prevent crop year growth of red sorrel in the crop year. Horseweed was not resistant to the mixture of labeled herbicides used by the grower, so it is best controlled with registered herbicides as spring pre-emergence applications.
Publications
- Type:
Conference Papers and Presentations
Status:
Published
Year Published:
2015
Citation:
Yarborough, D.E. and J. Cote. 2015. Evaluation of fall and spring combinations of preemergence herbicides to prevent weed resistance in wild blueberry fields. Proceedings of the Northeastern Weed Science Society 69:42.
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Progress 10/01/13 to 09/30/14
Outputs
Target Audience: Maine’s 575 wild blueberry growers and six grower/processors who produce 90 million pounds of wild blueberries on 60,000 acres in Maine. Changes/Problems:
Nothing Reported
What opportunities for training and professional development has the project provided? 68th Annual Meeting WSSA and Northeastern Weed Science Society Baltimore, MD February 6-9, 2014 Blueberry Open House (Rutgers University NJ grower meeting), Hammonton, NJ March 6, 2014 North American Research and Extension Workers Conference, Atlantic City, NJ June 24-26, 2014 17th Wild Blueberry Health Summit, Bar Harbor, ME September 17-19, 2014 Wild Blueberry Association of North America and Wild Blueberry Research and Extension Workers Annual Meeting, Quebec City, Quebec October 22-23, 2014 How have the results been disseminated to communities of interest? Evaluation of pre-emergence herbicide combinations to prevent weed resistance in wild blueberry fields in Maine, the Northeastern Weed Science Society Annual Meeting, Philadelphia, PA, January 7-9, 2014 Wild Blueberry Pest Management Update, Augusta Agricultural Trade Show, Augusta, ME January 9, 2014 Preventing Weed Resistance in Wild Blueberry Fields and Weed Management, NRCS/Extension in-Service Training and Program Update, Bangor, ME January 16, 2014. Systems Project Results for Weeds and Fertilizer, Wild Blueberry Spring Meetings, Waldoboro, Ellsworth, Machias, March 18,20,22, 2014. Wild Blueberry Pesticide License Training, University of Maine, Machias, ME, March 22, 2014. A systems approach to improving the sustainability of wild blueberry production - NIFA project 2009 – 2014. School of Food And Agriculture Seminar, Orono, ME April 14, 2014 Maine’s Wild Blueberry Industry, Gorham Elementary school 4th Grade Class, Gorham, ME May 9, 2014 Wild Blueberry Research on Managing Herbicide Resistance, Wild Blueberry Summer Field Day, Jonesboro, ME July 16, 2014 Maine’s Wild Blueberry Industry, Eagle Hill Institute, Stuben, ME August 30, 2014 Maine’s Wild Blueberry Industry, New England Guild of Book Workers, Cobscook Community Learning Center, Trescott, ME, September 13, 2014 A systems approach to improving the sustainability of wild blueberry Production. Wild Blueberry Association of North America and Wild Blueberry Research and Extension Workers Annual Meeting, Quebec City, Quebec October 22-23, 2014 What do you plan to do during the next reporting period to accomplish the goals? Presentations are planned at: 69thAnnual Meeting Northeastern Weed Science Society in Williamsburg, VA Agricultural Trade Show, Augusta, ME Spring grower meetings in Bangor, ME Annual Wild Blueberry Field Day, Jonesboro, ME Integrated Crop Management Field Training Sessions in Warren, Orland and Jonesboro, ME Wild Blueberry Association of North America and Wild Blueberry Research and Extension Workers Annual Meeting, Bangor, ME
Impacts
What was accomplished under these goals?
In the fall of 2013, a trial was initiated to test the efficacy of several unregistered and/or untested herbicides on wild blueberries in Maine, in conjunction with the industry standards hexazinone and terbacil. Nine sites across the wild blueberry growing region of Maine were sprayed in fall 2013 and/or preemergence in spring 2014 with indaziflam (5 oz/a fall and both in fall+spring; 6.5 oz/a spring), halosulfuron (1 oz/a fall), rimsulfuron (2 oz/a fall) or isoxaben (1.33 lb/a spring). In spring 2014 terbacil (2 lb/a), hexazinone (1 lb/a) or an untreated check was applied at right angles to the test herbicides for a total of 21 treatments. Wild blueberry cover and phytotoxicity, broadleaf weed cover, and grass cover were assessed in June and August 2014 for all treatments as well as the growers’ spray regimes outside the trial areas. Soil samples were also collected at each site and analyzed for percent organic matter, soil pH and soil texture. The main effects of the test herbicides alone, with hexazinone, or with terbacil were compared to the untreated check or to the samples from the growers’ fields; the test herbicide treatments were also compared to the check and the combinations to the industry standards. One site was dropped because it was over-sprayed by the grower, and six additional sites were excluded after data analysis indicated a lack of weeds across all treatments. There were no significant differences for main effects of the test herbicides with or without the industry standards, when compared to the untreated check or grower spray regimens. For eight pairwise comparisons, if the variances had been equal there would have been a significant difference, but the unequal variances negated the difference. There were no significant differences in blueberry cover among indaziflam treatments alone, with terbacil or with hexazinone at either assessment. Halosulfuron and halosulfuron+terbacil blueberry cover was significantly greater in August compared to the check or terbacil alone, respectively; otherwise, there were no other significant differences in blueberry cover or phytotoxicity. Phytotoxicity was minimal in general, and none was noted at the August assessment. The indaziflam, halosulfuron and isoxaben treatments combined with terbacil suppressed broadleaf weeds significantly more than terbacil alone. Indaziflam+terbacil also significantly suppressed broadleaf weeds compared to the check in June, but not in August. Grasses were essentially eliminated by terbacil and the terbacil combinations; otherwise, although grass pressure was very low there were no differences among the check and the herbicides alone, or hexazinone and its combinations. In summary, indaziflam, in combination with terbacil, is effective in controlling both broadleaf weeds and grasses whether applied in the fall or spring. Isoxaben also appears effective on both broadleaf weeds and grasses in combination with terbacil; halosulfuron alone or with terbacil was effective on grasses, but in this trial did not offer long-term suppression of broadleaf weeds. Rimsulfuron exhibited fair control of weeds, but was not significantly more effective than the standards alone. The combinations of fall and spring treatments provided for improved weed control versus what growers are currently using.
Publications
- Type:
Conference Papers and Presentations
Status:
Published
Year Published:
2014
Citation:
Yarborough, D.E. and J. Cote. 2014. Evaluation of pre-emergence herbicide combinations to prevent weed resistance in wild blueberry fields in Maine. Proceedings of the Northeastern Weed Science Society 68:71
- Type:
Journal Articles
Status:
Published
Year Published:
2014
Citation:
Yarborough, D.E. 2014. Improving Northern Bilberry (Vaccinium uliginosum) Production. Acta Horticulturae. 1017:223-230
- Type:
Journal Articles
Status:
Published
Year Published:
2014
Citation:
Drummond, F. and D.E. Yarborough. 2014. Growing Season Effects on Wild Blueberry (Vaccinium angustifolium) in Maine and Implications for Management. Acta Horticulturae. 1017:101-108
- Type:
Conference Papers and Presentations
Status:
Published
Year Published:
2013
Citation:
Farooque A.A., Q.U. Zaman , D. Groulx, T. Nguyen-Quang , D. Yarborough, A.W. Schumann, Y. K. Chang, and T. J. Esau. 2013. Effect of Ground Speed and Header Revolutions on the Picking Efficiency of Wild Blueberry Harvester. 2013 ASABE Annual International Meeting, Kansas City, Missouri, July 21 24, 2013
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Progress 10/01/12 to 09/30/13
Outputs
Target Audience: Target audiences include the 575 wild blueberry growers who have farms in the State of Maine and growers in New Hampshire and Massachusetts. Changes/Problems:
Nothing Reported
What opportunities for training and professional development has the project provided? 67th Annual Meeting WSSA and Northeastern Weed Science Society Baltimore, MD February 4-7, 2013 Blueberry Open House (Rutgers University NJ grower meeting), Hammonton, NJ March 14, 2013 2013 Berry Health Benefits Symposium, Charlotte, NC, June 18-20, 2013 16th Wild Blueberry Health Summit, Bar Harbor, ME August 14-16, 2013 Wild Blueberry Associatio of North America and Wild Blueberry Research and Extension Workers Annual Meeting, Bangor, ME, October 24-25, 2013 How have the results been disseminated to communities of interest? 2013 Presentations were made to wild blueberry growers on systems or ancillary projects at the Augusta Agricultural Trade Show, Augusta, ME January 10, 2013 Washington-Hancock County Farm Bureau Grower Meeting, Blueberry Hill Farm, Jonesboro, ME February 11, 2013 Spring grower meetings in Waldoboro, Ellsworth and Machias on March 19, 21 and 23, 2013 Integrated Crop Management Field Training Sessions in Warren on Tuesday, April 23, May 28, and June 25, Orland on Thursday, April 25 May 30 and June 27 and Jonesboro on Wednesday, April 24, May 29, and June 26, 2013 Wild Blueberry Field Day, Jonesboro, ME July 17, 2013. Progress reports on the systems studies were made to the Wild Blueberry Advisory Committee on February 12 and October 30, 2013. Weed studies presentations were made to weed scientists at 67thAnnual Meeting Northeastern Weed Science Society Baltimore, MD February 4-7, 2013. What do you plan to do during the next reporting period to accomplish the goals? Presentations are planned at the 68thAnnual Meeting Northeastern Weed Science Society in Philadelphia, PA. Agricultural Trade Show, Augusta, ME, Spring grower meetings in Waldoboro, Ellsworth and Machias, ME. Integrated Crop Management Field Training Sessions in Warren, Orland and Jonesboro, ME. Papers will be presented at the North American Research and Extension Workers Meeting in New Jersey June 22-26 and at the Wild Blueberry Association of North America and Wild Blueberry Research and Extension Workers Annual Meeting, Quebec City, Qubec, Canada, October 27-28, 2014.
Impacts
What was accomplished under these goals?
In 2013 we continued to assess three new herbicides for efficacy in weed control and effects on blueberry growth and yield. The effects of 2012 prune year rate and timing of indaziflam (Alion) and halosulfuron (Sandea) application on 2013 yield was investigated. In April 2013, a trial was set up at nine sites which examined the effects of pre-emergence Alion, Sandea and rimsulfuron (Matrix), alone and combined with hexazinone (Velpar) or terbacil (Sinbar), on wild blueberry cover/injury and weed cover; the growers’ spray regimens with and without Sandea were included. A demonstration plot was also set up to compare the effects of the same three herbicides when applied in the fall after pruning. Alion and Matrix, alone or in combination with Velpar or Sinbar, did not reduce wild blueberry cover or result in unacceptable phytotoxicity. Sandea alone or in combination did show initial stunting and delay in growth, but the plants recovered over the growing season. The growers’ spray regimen alone, Sandea alone, and the combination had an effect in suppressing broadleaf weeds over the long-term, as did Velpar, Alion+Velpar, Sandea+Velpar, Alion+Sinbar and Matrix+Sinbar (but was not significant). Grasses were initially controlled by Sandea+Velpar, Sinbar, Alion+Sinbar and Matrix+Sinbar. In addition, although in August only Matrix+Sinbar continued to control grasses, all of the Sinbar combinations continued to maintain grass cover about 5% or below. Applying Alion, Matrix and Sinbar in the fall appeared to slightly improve long-term blueberry cover overall, as well as reduce early Sandea phytotoxicity. Fall application improved broadleaf weed control in general compared to spring application when combined with spring Velpar. Grass control was improved by fall application of Alion with spring Velpar, and to a lesser extent Sandea+Velpar and Sandea+Sinbar grass control improved as well when compared to Sandea applied in spring. Crop year yields for Alion and Sandea rate and timing were examined in conjunction with the prune year blueberry and weed cover data. Alion 5 oz/a was sufficient to suppress weeds when used with Velpar or Sinbar, without adverse effects on blueberry yield, if applied no later than early May. Sandea resulted in unacceptable injury and crop loss when applied near emergence. Sandea at 1 oz/a was effective on grasses when used with Sinbar, but must be applied in early May or before; it did not provide significant benefits for broadleaf weed control with or without Velpar.
Publications
- Type:
Other
Status:
Published
Year Published:
2013
Citation:
Yarborough, D.E. and J. DAppollonio-Cote. 2013. Effect of timing and combinations of preemergence herbicides for weed control in wild blueberry fields. Proceedings of the Northeastern Weed Science Society 67:48.
- Type:
Other
Status:
Published
Year Published:
2013
Citation:
Yarborough, D.E. and J. DAppollonio-Cote . 2013. Pre- and Post-emergence Applications of Herbicides for Control of Festuca filiformis in Wild Blueberry (Vaccinium angustifolium) Fields. Proceedings of the Northeastern Weed Science Society 67:128.
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