Progress 10/01/20 to 09/30/21
Outputs Target Audience:The target audience for this research includes both undergraduate and graduate students (for classroom lectures and discussions), pest management professionals (PMPs), and other professional urban entomologists, insect physiologists, and insect behaviorists. Changes/Problems:
Nothing Reported
What opportunities for training and professional development has the project provided?Results from this research have been presented to pest management professionals as well as undergraduate and graduate students. How have the results been disseminated to communities of interest?Results have been presented to pest management professionals at the Alabama Pest Control Association winter and summer meetings and at meetings of the Entomological Society of America. What do you plan to do during the next reporting period to accomplish the goals?Continued studies on the toxicity and repellency of conventional insecticides and essential oil products are planned for the next reporting period.
Impacts What was accomplished under these goals?
Effective control of domestic and peridomestic cockroaches requires integrated approaches that emphasize concurrent use of chemicals with alternative control tactics. An integrated pest management (IPM) approach is particularly justified in environments where satisfactory cockroach control cannot be achieved due to multiple factors including the development of insecticide aversion and resistance in some cockroach species, and poor sanitation or structural issues that foster infestations. While a flurry of research efforts have been devoted to studying alternative tactics for cockroach control, only a few of them have been evaluated in the context of IPM programs. This review focuses on examining studies on alternative tactics that are proven efficacious, economical, and logistically feasible for their inclusion in IPM programs for important domestic and peridomestic cockroaches in the USA. Management programs that educate the public on cockroach biology, behavior, and the importance of sanitation; use of traps to monitor infestation levels; apply targeted low impact insecticides such as baits, have demonstrated a greater success for effective and sustainable control of cockroaches when compared to an insecticide-only approach. Incorporation of other alternative control methods into IPM programs will require more applied research that validates their use in real-world scenarios and demonstrates their cost-effectiveness.
Publications
- Type:
Book Chapters
Status:
Published
Year Published:
2021
Citation:
Appel, A. G. 2021. Biology, nutrition, and physiology. pp. 53-74. In Changlu Wang, Chow-Yang Lee, and Michael K. Rust (eds.), Biology and Management of the German Cockroach. CSIRO Publishing, Australia.
- Type:
Book Chapters
Status:
Published
Year Published:
2021
Citation:
Appel, A. G. and M. K. Rust. 2021. German cockroach management using baits. pp. 213-230. In Changlu Wang, Chow-Yang Lee, and Michael K. Rust (eds.), Biology and Management of the German Cockroach. CSIRO Publishing, Australia.
- Type:
Journal Articles
Status:
Published
Year Published:
2021
Citation:
Gondhalekar, A. D., A. G. Appel, G. M. Thomas, and A. Romero. 2021. A Review of Alternative Management Tactics Employed for the Control of Various Cockroach Species (Order: Blattodea) in the USA. Insects. 12(6), 550; https://doi.org/10.3390/insects12060550
- Type:
Journal Articles
Status:
Accepted
Year Published:
2021
Citation:
Appel, A.G., B. N. Dingha, M. J. Eva, and L. E. N. Jackai. 2021. Toxicity, repellency, and laboratory performance of consumer bait products for German cockroach (Blattodea: Ectobiidae) management. Florida Entomologist.
|
Progress 10/01/19 to 09/30/20
Outputs Target Audience:Target audience for this research includes both undergraduate and graduate students (for classroom lectures and discussions), pest management professionals (PMPs), and other professional urban entomologists, insect physiologists, and insect behaviorists Changes/Problems:
Nothing Reported
What opportunities for training and professional development has the project provided?Results from this research have been presented to pest management professionals as well as undergraduate and graduate students. How have the results been disseminated to communities of interest?Results have been presented to pest management professionals at the Alabama Pest Control Association winter and summer meetings and at meetings of the Entomological Society of America. What do you plan to do during the next reporting period to accomplish the goals?Continued studies on the toxicity and repellency of conventional insecticides and essential oil products are planned for the next reporting period.
Impacts What was accomplished under these goals?
The high surface area to volume ratio of terrestrial insects makes them highly susceptible to desiccation mainly through the cuticle. Cuticular permeability (CP) is usually the most important factor limiting water loss in terrestrial insects. Water loss rate, percentage of total body water (%TBW) content, CP, and desiccation tolerance were investigated in workers of four Solenopsis species in the southeastern USA. We hypothesized that tropical/subtropical ants (S. invicta and S.geminata) will have lower CP values and tolerate higher levels of desiccation than temperate ants(S. richteri and S. invicta × S. richteri). The %TBW content was similar among species. Solenopsis invicta had a 1.3-fold and 1.1-fold lower CP value than S. invicta × S. richteri and S. richteri, respectively. Solenopsis geminata had a 1.3-fold lower CP value than S. invicta × S. richteri, and a 1.2-fold lower CP value than S. richteri. The LT50 values (lethal time to kill 50% of the population) ranged from 1.5 h (small S. geminata) to 8.5 h (large S. invicta). Desiccation tolerance ranged between 36 and 50 %TBW lost at death and was not related to a species' location of origin. This study is the first report of water relations of S. invicta × S. richteri. It demonstrates that desiccation stress differentially can affect the survival of different Solenopsis species and implies that environmental stress can affect the distribution of these species in the southeastern USA. Water loss rate, percentage total body water content (%TBW), cuticular permeability (CP), and desiccation tolerance were investigated in adult and immature stages of the invasive kudzu bug, Megacopta cribraria (Fab.) (Hemiptera: Plataspidae), a serious soybean pest and an urban nuisance. Adults and all five nymphal instars were weighed prior to and 2, 4, 6, 8, 10, and 24 h after desiccated at 30 ± 1°C and 0-2% RH. Both % initial mass and %TBW loss increased linearly with time of desiccation. Rates of loss ranged from approximately 1-7%/h. Mortality occurred at 10 h after desiccation. Desiccation tolerance (%TBW lost at death) ranged between 25.6% for first-generation adult females and 75% for first-generation fifth-instar nymphs. First-generation first-instar nymphs had significantly greater %TBW (88.9%) than the other generations and instars, whereas second-generation fifth instars had the lowest %TBW (62.4%). The CP value of first-generation adult females (12.3 ± 1.6 µg cm-1 h-1 mmHg-1) was the greatest across generations. First-generation first instars had the greatest mass loss (111.11 mg/g) among all instars and generations, whereas overwintered second-generation adult females had the lowest mass loss (18.39) across generations. This study demonstrated that desiccation stress differentially affected the survival of adult and nymphal kudzu bugs and may imply that environmental stress can affect the relative abundance of this species in the fields and around homes. The use of essential oil components (EOCs) against the German cockroach, Blattella germanica (L.), has increasingly received attention from researchers. However, the determination of lethal doses/concentrations alone does not provide enough information on the range of biological effects of these EOCs. To improve our understanding of the potential effects of EOCs, we examined the biological parameters of B. germanica exposed to sublethal EOCs formulated in gels. This study employed superabsorbent polymer (SAP) gel to prolong bioavailability of limonene, carvacrol, and β-thujaplicin and evaluated how these EOCs shape biological parameters of B. germanica. Overall, median survival days ranged from 57 to 69.5 d for males and 73 to 99 d for females. The survival day ranking for the EOCs was limonene > β-thujaplicin > carvacrol. Carvacrol and β-thujaplicin gels reduced male longevity by at least 34 and 39%, respectively, while limonene had no effect. The longevity of females was reduced by limonene, but not by carvacrol and β-thujaplicin gels. EOCs significantly suppressed overall adult females' reproductive period, oothecal hatchability, reduced fecundity, and interoothecal period, but not the number of oothecae formed and egg incubation period. The preoviposition period (mean: 2-25 d) ranking was limonene < carvacrol < β-thujaplicin. Based on these results, limonene, carvacrol, and β-thujaplicin in SAP gels show promising potential to reduce adult male survival/longevity, suppress egg hatchability and female fecundity, and delay the interoothecal period. These findings may represent the basis for the practical use of EOCs as a tactic in integrated pest management systems for B. germanica.
Publications
- Type:
Journal Articles
Status:
Published
Year Published:
2020
Citation:
Benk, G., P. J. Thompson, X. P. Hu, and A. G. Appel. 2020. Water loss and desiccation tolerance of the two yearly generations of adult and nymphal Kudzu bugs, Megacopta cribraria (Hemiptera: Plataspidae). Environ. Entomol. 49: 651-659.
- Type:
Journal Articles
Status:
Published
Year Published:
2020
Citation:
Gardner, S. T., V. R. Assis, K. M. Smith, A. G. Appel, and M. T. Mendon�a. 2020. Innate immunity of Florida cane toads: how dispersal has affected physiological responses to LPS. Journal of Comparative Physiology B. 190: 317-327.
- Type:
Journal Articles
Status:
Published
Year Published:
2020
Citation:
Ajayi, O. S., A. G. Appel, L. Chen, and H. Y. Fadamiro. 2020. Comparative cutaneous water loss and desiccation tolerance of four Solenopsis spp. (Hymenoptera: Formicidae) in the southeastern United States: implications for distribution patterns. Insects. 2020, 11, 418; doi:10.3390/insects11070418
- Type:
Journal Articles
Status:
Published
Year Published:
2020
Citation:
Oladipupo, S. O., X. P. Hu, and A. G. Appel. 2020. Topical toxicity profiles of some aliphatic and aromatic essential oil components against insecticide-susceptible and resistant strains of German cockroach (Blattodea: Ectobiidae). J. Econ Entomol. 113: 896-904.
- Type:
Journal Articles
Status:
Published
Year Published:
2020
Citation:
Oladipupo, S. O., X. P. Hu, and A. G. Appel. 2020. Essential oil components in superabsorbent polymer gel modify reproduction of Blattella germanica (L.) (Blattodea: Ectobiidae). J. Econ. Entomol. 113: 2436-2447.
|
Progress 10/18/18 to 09/30/19
Outputs Target Audience:Target audience for this research includes both undergraduate and graduate students (for classroom lectures and discussions), pest management professionals (PMPs), and other professional urban entomologists, insect physiologists, and insect behaviorists. Changes/Problems:
Nothing Reported
What opportunities for training and professional development has the project provided?Results from this research have been presented to pest management professionals as well as undergraduate and graduate students. How have the results been disseminated to communities of interest?Results have been presented to pest management professionals at the Alabama Pest Control Association winter and summer meetings and at meetings of the Entomological Society of America. What do you plan to do during the next reporting period to accomplish the goals?Continued studies on the toxicity and repellency of conventional insecticides and essential oil products are planned for the next reporting period.
Impacts What was accomplished under these goals?
These results provide better understanding of how insecticides work against termites at different temperatures and concentrations that are relevant to homeowners and pest control professionals. Insecticides cause predictable changes in termite behavior before they kill. These behaviors are important to enable the spread of insecticide through a colony and kill it. If insecticides work too quickly, they cannot be transferred. If they work too slowly, they can be diluted and become ineffective. Understanding the biology and development of insects helps to develop accurate methods of predicting insect population growth and ultimately models that will help the timing of insecticide applications for superior control. We estimated the number of developmental stages (instars) of the invasive Asian cockroach and determined that it can have 2-3 generations per year in Alabama. We determined the toxicity of several essential oils against German cockroaches. Essential oils are popular and relatively safe compounds that are also used in perfume, cleaning agents, and as spices. These compounds can be toxic to German cockroaches, the most important insect pest in homes and apartments. Many essential oils are toxic and some are toxic to cockroaches that are resistant to conventional insecticides. Some of these essential oils however are detoxified by the same mechanisms as conventional inesticides. Behavioral symptoms and mortality associated with intoxication with the insecticides fipronil and indoxacarb were determined in field-collected eastern subterranean termites, Reticulitermes flavipes (Kollar), and Formosan subterranean termites, Coptotermes formosanus Shiraki. These termites are major economic pests throughout the southeastern United States and many other locations worldwide. Behaviors and mortality were evaluated at three temperatures (16, 22, and 28°C) and three concentrations of fipronil (0.5, 1, and 5 ppm) and indoxacarb (50, 75, and 100 ppm). LT50 (median lethal time to kill 50% of the termites) values declined with increasing concentrations and temperatures for both fipronil-exposed eastern and Formosan subterranean termites, whereas these values were not always the highest at 16°C for indoxacarb-treated termites. The greatest change (reduction) in LT50 values occurred for both species between 16 and 22°C at the lowest concentration of each insecticide. Intoxication and moribundity were the most frequently observed behaviors for fipronil-exposed termites, whereas intoxication, ataxia, and moribundity were observed for most concentration and temperature combinations for indoxacarb-exposed termites. The inherent toxicity of fipronil was higher than that of indoxacarb. The higher presence and duration of intoxication behaviors may positively affect the performance of indoxacarb against subterranean termite colonies. The Asian cockroach, Blattella asahinai Mizukubo, has expanded its range throughout the southeastern United States since its introduction into Florida. Unlike its closest relative, the German cockroach, Blattella germanica (L.), B. asahinai lives outdoors and can fly. There is little information on the biology and development of B. asahinai, including the number of instars during nymphal development. To estimate the number of instars of B. asahinai nymphs were photographed, sexed, and the lengths and widths of their pronota were measured digitally. The number of instars of B. asahinai was estimated using Gaussian mixture models with the pronotal data. The most probable model and its clusters were selected to assign individuals to an instar. Instars were also determined by counting the number of cercal annuli of nymphs. Both clustering and cercal annuli indicated that B. asahinai most frequently had six instars when reared at 30°C. Growth did not strictly follow the Brooks-Dyar Rule, because nymphs had different numbers of instars and different growth patterns. Although Gaussian mixture models are not efficient for field sampling experiments, digital measurements may provide a way to estimate instars with live specimens in development studies without handling the animals in a way that may alter growth. Toxicity profiles of four aliphatic (α-pinene, cyclononanone, limonene, nerolidol), four aromatic (β-thujaplicin, carvacrol, eugenol, tropolone) essential oil components (EOCs), and permethrin were investigated against three strains of German cockroach, Blattella germanica (L.). The strains include a susceptible strain (S), and two multi-resistant strains - strains D and E. Also, a synergism bioassay, using piperonyl butoxide (PBO) was conducted. The most toxic EOCs were aromatic EOCs carvacrol, eugenol, and tropolone, followed by aliphatic EOC limonene; all had LD50 values of <0.7 mg/μl. Four of the EOCs were equally toxic against all the strains, with carvacrol being the most toxic, followed by eugenol, tropolone, and α-pinene. The other four EOCs were more toxic against strain S than against the two resistant strains. Permethrin was significantly more toxic to strain S (LD50 = 0.056 μg/μl) compared with the resistant strains (D = 2.138 μg/μl, E = 1.730 μg/μl). Toxicity of aliphatic EOCs correlated positively with their molecular weight against strain E only, whereas both molecular weight and vapor pressure of aromatic EOCs correlated significantly with toxicity in all strains. Strain D exhibited the greatest resistance (RR of 6.7) to EOCs, and synergism to the aliphatic EOC cyclononanone. Clear synergism with PBO was observed in permethrin against resistant strains, but not in all of the EOCs, suggesting multiple resistance mechanisms in the resistant cockroaches. These findings give insight on the potential of EOCs to be incorporated as parts of an IPM approach to managing insecticide resistant German cockroaches
Publications
- Type:
Journal Articles
Status:
Published
Year Published:
2019
Citation:
Quarcoo, F. Y., X. P. Hu, and A. G. Appel. 2019. Temperature-mediated variations in behavior and mortality caused by non-repellent insecticides in subterranean termites (Blattodea: Rhinotermitidae). Insects 10 (2), 37; 1-14.
- Type:
Journal Articles
Status:
Published
Year Published:
2019
Citation:
Peterson, M. K., A. G. Appel, and X. P. Hu. 2019. Instar determination of Blattella asahinai (Blattodea: Ectobiidae) from digital measurements of the pronotum using Gaussian mixture modeling and the number of cercal annuli. J. Entomol. Sci. 19: 5; 1-14.
- Type:
Journal Articles
Status:
Published
Year Published:
2019
Citation:
Oladipupo, S. O., X. P. Hu, and A. G. Appel. 2019. Topical toxicity profiles of some aliphatic and aromatic essential oil components against insecticide-susceptible and resistant strains of German cockroach (Blattodea: Ectobiidae). J. Econ Entomol. toz323, https://doi.org/10.1093/jee/toz323.
|
|