Hexaflumuron was evaluated for effects on gustatory response and reproduction of boll weevil, Anthonomus grandis grandis Boheman, captured in pheromone-baited traps. Hexaflumuron is an insect-growth regulator that inhibits chitin synthesis and disrupts insect cuticle formation during molting. The intent was to determine the effect of hexaflumuron mixed in ppm active ingredient (weight:volume) with 10% sucrose as a feeding stimulant on gustation and reproduction of boll weevil. Regardless of concentrations, weevils captured in pheromone-baited traps in the fall ingested significantly more hexaflumuron than those captured in the spring. Seasonal mean amount of hexaflumuron ingested by the weevil decreased significantly with greater concentrations (adjusted R2 = 0.82). At 5 and 25 ppm, hexaflumuron significantly depressed gustatory response for falland spring-captured boll weevils, respectively. Hexaflumuron at 5 and 25 ppm significantly depressed oviposition and larval hatch, respectively, for both springand fall-captured weevils. However, reduction in larval hatch was minimal. Data suggest that the use of hexaflumuron as a toxicant for suppression of boll weevil when ingested is limited because of inhibitory gustatory response and minimal reduction in larval hatch. However, this method of application used for hexaflumuron may be important for other insecticides to determine effectiveness on mortality and reproduction of weevils.
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