Lesser mealworm, Alphitobius diaperinus (Panzer) (Coleoptera: Tenebrionidae), adults were collected from six eastern Texas broiler facilities and examined for susceptibility to four formulated insecticides. Data indicate that A. diaperinus adults exposed to filter papers treated with the label rates of the insecticides exhibit some level of recovery. Approximately 20% or less A. diaperinus adults treated with Tempo SC Ultra (8 ml/92.9 m2, 11.8% beta-cyfluthrin) or Talstar WP Insecticide/Miticide (23.3 ml/92.9 m2, 10% bifenthrin) and recorded as moribund at the 4-h observation period recovered by the 24-h observation period. A. diaperinus adults treated with Tempo SC Ultra and Talstar WP also had the greatest percentage of mortality for both observation periods. A. diaperinus adults treated with Dragnet SFR (49.7 ml/92.9 m2, 36.8% permethrin) had the greatest level of recovery at approximately 50-60% overall, which was similar to that recorded for the water-only control. Additionally, five of the six A. diaperinus populations treated with Dragnet SFR resulted in < 10% mortality for both observation periods. Unlike the other insecticides examined, Talstar Professional Insecticide (10 ml/92.9 m2, "Talstar Pro," 7.9% bifenthrin) resulted in approximately 50% more A. diaperinus mortality at the 24-h than the 4-h observation period due primarily to increased mortality recorded for Farm F. A. diaperinus adults from farm D had > or = 87% knockdown 4 h after treatment to all compounds examined, indicating a high degree of sensitivity to these compounds. However, approximately 90% of the A. diaperinus adults from this population treated with Dragnet SFR and recorded as moribund recovered by the 24-h observation. A. diaperinus adults from this population treated with the other insecticides exhibited limited recovery. Susceptible adult A. diaperinus populations are still present in Texas, based on the populations examined. But, identifying these populations is difficult and time-consuming. Consequently, screening populations before treatment might not be feasible. However, newer generation pyrethroids examined in this study seem to be suitable for suppressing A. diaperinus populations in broiler facilities.
Soil adjacent to new brick veneer work is likely to have a higher pH owing to the mixture of cement with the soil. In the Gainesville, FL, area, soil samples taken from such locations had a range of pH values from 9.0 to 10.1; similar soils used in bioassays had a pH of 5.6 before the addition of cement. Addition of 15 mg of Portland cement to 33 g of soil increased the pH to 6, and addition of 291 mg of Portland cement increased the pH to 9. The pH of soil amended with cement was stable for the first 5 months. After 10 months, soil pH values decreased from alkaline to near neutral in all cases. Eastern subterranean termite workers, Reticulitermes flavipes (Kollar), were exposed to the treated soil at pH 6-9 for 24 h, and percentage mortality was recorded at 5 days, 5 months and 10 months. Termite mortality significantly decreased at higher soil pHs for bifenthrin, chlorpyrifos, fipronil and imidacloprid treatments at 5 months and similarly for bifenthrin, permethrin, chlorpyrifos, fipronil and imidacloprid treatments at 10 months. There was an inverse linear relationship between soil pH and mortality. Increased soil pH diminished residual activity of termiticide in the following order: imidacloprid > fipronil > chlorpyrifos = bifenthrin > permethrin > cypermethrin.
The toxicity of imidacloprid to cat fleas on glass was investigated at 20, 26, 30, and 35 degrees C. Imidacloprid was most toxic to adult cat fleas at 35 degrees C and to larvae at 20 degrees C. Piperonyl butoxide (PBO), a synergist, increased the relative potency of imidacloprid (1:5 imidacloprid:PBO) 16-fold at 26 degrees C against adults, but had no effect at 35 degrees C. No synergism occurred in larvae at 20 degrees C, but addition of PBO (1:5 imidacloprid:PBO) doubled toxicity at 26 degrees C. PBO (1:5 imidacloprid:PBO) could possibly be used to synergize imidacloprid premise treatments (20-30 degrees C), but it is not likely to be effective in pet treatments because no synergism occurred in adult fleas at 35 degrees C (average fur temperature of tested cats and dogs).
Commercially available spray-dried protein sources were evaluated as replacement laboratory cat flea, Ctenocephalides felis felis (Bouché), larval diets for slaughterhouse-collected heat-dried blood. Percentage of adult emergence of fleas reared on adult flea feces (87.7%) and spray-dried bovine blood (79%) did not significantly differ, and yeast supplementation did not significantly increase adult emergence for spray-dried diets. However, yeast supplementation of heat-dried blood increased percentage adult emergence from 0 to 41.7%. Spray-dried bovine blood was found to be a satisfactory laboratory diet for cat flea larvae.
Lesser mealworm, Alphitobius diaperinus (Panzer) (Coleoptera: Tenebrionidae), adults were collected from six eastern Texas broiler facilities and examined for susceptibility to four formulated insecticides. Data indicate that A. diaperinus adults exposed to filter papers treated with the label rates of the insecticides exhibit some level of recovery. Approximately 20% or less A. diaperinus adults treated with Tempo SC Ultra (8 ml/92.9 m2, 11.8% beta-cyfluthrin) or Talstar WP Insecticide/Miticide (23.3 ml/92.9 m2, 10% bifenthrin) and recorded as moribund at the 4-h observation period recovered by the 24-h observation period. A. diaperinus adults treated with Tempo SC Ultra and Talstar WP also had the greatest percentage of mortality for both observation periods. A. diaperinus adults treated with Dragnet SFR (49.7 ml/92.9 m2, 36.8% permethrin) had the greatest level of recovery at approximately 50-60% overall, which was similar to that recorded for the water-only control. Additionally, five of the six A. diaperinus populations treated with Dragnet SFR resulted in < 10% mortality for both observation periods. Unlike the other insecticides examined, Talstar Professional Insecticide (10 ml/92.9 m2, "Talstar Pro," 7.9% bifenthrin) resulted in approximately 50% more A. diaperinus mortality at the 24-h than the 4-h observation period due primarily to increased mortality recorded for Farm F. A. diaperinus adults from farm D had > or = 87% knockdown 4 h after treatment to all compounds examined, indicating a high degree of sensitivity to these compounds. However, approximately 90% of the A. diaperinus adults from this population treated with Dragnet SFR and recorded as moribund recovered by the 24-h observation. A. diaperinus adults from this population treated with the other insecticides exhibited limited recovery. Susceptible adult A. diaperinus populations are still present in Texas, based on the populations examined. But, identifying these populations is difficult and time-consuming. Consequently, screening populations before treatment might not be feasible. However, newer generation pyrethroids examined in this study seem to be suitable for suppressing A. diaperinus populations in broiler facilities.
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