217 



Replicated field experiments of certain materials with and without DDT showed 

 that methyl ^Jarathion, methyl parathion + DDT, toxaphene + methyl parathlon, 

 toxaphene + I'DT, and azinphosmethyl + methyl parathion gave .good control of the 

 bollworm, Heliothls zea (Boddie), and the boll weevil, Anthononu8 erand^s Bohe- 

 man, when weather was favorable and insecticide applications were made at short 

 intervals. F.Dwever, when rainfall was excessive and applications could not be 

 applied at short intervals, methyl parathion, EPN (0-ethyl 0-p-:;itrophenyl 

 phenylphosphonothioate), EPN + methyl parathion, and toxaphene + methyl parathion 

 at the rates tested failed to give good control. In 2 experiments in which the 

 differences in yield were atatistically significant, formulations containing 

 toxaph >ne + DDT + methyl parathion and toxaphene + DDT produced the highest 

 yields, indicating that under prevailing weather conditions and bollworm popu- 

 lation pressures in the southeast, use of materials with less residual activity 

 will result in poorer control and lower yield. 



420. ; Taft, H. M. ; and Roach, S. H. 1977. Boll weevils: Leggett traps 

 as a substitute for woods trash examinations as an indicator of poten- 

 tial field populations. J. Econ. Entomol. 70: 445-446. 



During a 3-yr study, the number of emerging overwintered Anthonomu s grandis 

 Boheman captured in Leggett traps vas positively correlated throughout the 

 emergence period with the number of A. grandis found previously in samples 

 of surface wood^ trash. Thus, the traps can detect a potential early field 

 population on individual farms. This information will be useful in both 

 pest management and eradication programs. 



421. ; Taft, H. M. ; Roach, S. H.; and James, W. 1972. Movement and 

 survival of boll weevils in several hibernation environments. J. 

 Econ. Entomol. 65: 82-85. 



Anthonomus grind is Boheman obtained from surface woods trash in the fall were 



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