378 



temic insecticides resulted in earlier fruiting of plants in 3 of the 6 

 tests, but yields increased as a result in only 1 test. 



739. ; Furr, R. E.; and Stadelbacher, E. A. 1971. Materials for control of 

 boll weevils, bollworms, and tobacco budworms on cotton at Stoneville, 

 Mississippi. J. Econ. Entomol. 64: 475-478. 

 When experimental insecticides were evaluated for control of boll weevils, 

 Anthonomus grandis Boheman; bollworms, Heliothis zea (Boddie) ; and tobacco 

 budworms, H^. virescens (F.), on cotton in field-plot tests at Stoneville, 

 Miss, in 1969, CIBA C-9491 (0-(2, 5-dichloro-4-iodophenyl) 0, 0-dimethyl 

 phosphorothioate) and Velsicol VCS-506 (0-(4-bromo-2, 5-dichlorophenyl) 0-raethyl 

 phenylphosphonothioate) applied as conventional emulsifiable concentrate sprays 

 gave control of Heliothis spp., primarily tobacco budworms, comparable to the 

 standard treatment. Several other materials including formulations of Bacillus 

 thuringiensis Berliner wer less effective. Ultra low volume (1/2 gal or less/ 

 acre) sprays of EPN (0-cthyl 0-£-nitrophenyl phenylphosphonothioate), EPN + 

 methyl parathlon, malathion + methyl parathion, methyl parathion, and toxa- 

 phene + DDT + methyl parathion gave very good control of Heliothis . Control 

 of the Heliothis resulted in increases in yield of as much as a bale of seed 

 cotton/acre. ~ 



740. Phillips, J. R. 1976. Diapause as it relates to the boll weevil, Anthonomus 

 grandis Boheman. In Boll Weevil Suppression, Management, and Elimination 

 Technology. Proceedings of a Conference, February 13-15, 1974, Memphis, 

 Tennessee. U.S. Agric. Ren. Serv. [Rep.] ARS-S-71, pp. 10-11. 

 These data support the assumption that the weevil in its northward movement has 

 adapted to photoperiod as an indicator of season but has also retained the 

 capacity to "read" its host, no doubt a characteristic that evolved around the 

 occurrence of dry- and wet-season conditions that exist south of the border. 



