285 



Azinphosmethyl applied as an ultra-low-volurae spray at 0.2 and 0.25 lb per acre 

 was ais effective as a water-emulsion spray of methyl parathion (0.5 lb per acre) 

 in a reproduction-diapause control experiment conducted in Carroll County, 

 Mississippi, against the boll weevil, A nthonomus grandis Boheman. A lower rate 

 of azinphosmethyl, 0.125 lb per acre, was less effective. Populations of boll 

 weevils sampled in woods trash adjoining treated and untreated fields were re- 

 duced 9A% the fall of 1965 and 98% the spring of 1966. 



542. ; Wood, R. H.; and Mitchell, E. B. 1977. Boll weevil: suppression 



with TH-6040 appliea in cottonseed oil as a foliar spray. J. Econ. Entomol. 

 70: 442-444. 

 In the laboratory, Thompson-Hayward TH-6040 (N-4-chlorophenyl)-N-(2,6-diflu- 

 orobenzoyl)urea) formulated in cottonseed oil and applied to cotton plants 

 was effective in preventing hatch of eggs laid by female Anthonomus grandis 

 Boheman ior 4-7 days after the females were exposed. In the field, TH-6040 

 (0.25 Al/acre) in cottonseed oil applied every 4 to 5 days from initiation 

 of squaring in mid-June until late Aug. either caused all eggs to fail to 

 hatch or caused emerging larvae to die in the Ist instar. As a result, no 

 1st field-generation boll weevils could be detected by in-field trapping 

 until Aug. 20. Even then, the populaticfr was very low and could be attri- _ 

 *-*-feutea partially to rainfall that washed off 2 successive treatjjients of TH- 

 6040 in late July. 



543. Lopez, J. D., Jr. 1980. Comparison of two types of boll weevil pheromone 

 traps to monitor seasonal response. J. Econ. Entomol. 73: 324-326. 



The relative efficiency of Leggett and Story<^ pheromone traps in capturing 

 Anthonomus grandis grandis Boheman was compared in a noncompetitive situation 

 in central Texas. The pattern of seasonal response of the boll weevil to the 

 traps was similar to that reported in other areas. Throughout the growing 





