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308 



to the new baits. Addition of fumaric acid gave no clear improvement in either 

 the percentage of the weevils that started to feed or in an increase in total 

 amount eaten per feeding individual. The 100% oil bait had the greatest inges- 

 tion response and was equaled statistically by other high oil baits. The great- 

 est difference between formulations was seen v/ith initiation of feeding. The 

 percentage of weevils that started to feed was positively correlated to increased 

 concentrations of invert sugar. Therefore, the best field formulations must be a 

 balance between the percentage of the population that can be induced to feed on 

 the bait and the total amount eaten by an individual weevil when the pathogen or 

 chemical must be eaten in order to kill the Insect. The desired goal is that 

 of getting enough of the population to eat a killing dose of the bait in order 

 to produce an acceptable reduction of the population. 



599. . 1976. Response of the boll weevil to TH 6040 administered by 



feeding. J. Econ. Entoraol. 69: 317-318. 

 When the IGR, Thompson-Hayward 6040 (N-(4-chlorophenyl) -N'-(2, 6-difluoro- 

 benzoyl) urea), was fed to adult 9 Anthonomus grandis Boheman for 24 h, the 

 concentration of the chemical required to inhibit the hatch (embryonic EDcq) 

 of 50% of the eggs resulting at ca. 72 h after ingestion was 431 ppa. It was 

 2797^ppm at ca. 216 h. The EIcq's (intervals required for inhibition to 

 decrease to 50%) were 32 h for an initial dose of 201 ppm, 62 h for 576 ppm, 

 and 218 h for 4034 ppm. The ED5Q of TH 6040 for an oral dose of 0.11 \ig was 

 84 hours. 



600. . 1977. Dose-responses of the boll weevil to topical formulations of 



TH-6040. J. Ga. Entomol. Soc. 12: 369-370. 

 The growth-regulating chemical, Thompson-Hayward TH-6040 (N-(4-chlorophenyl) — 

 (2, 6-difluorobenzoyl)urea; Dimilin®, which interferes with egg hatch in adult 

 boll weevils, Anthonomus grandis Boheman, was tested to determine the effective 



