flf,ttrtgiiti^iim^t Kl^ mi . if i i «n i f i i i » «» u^nijf jiV .'; tjif i mi.*-«JH.j !i' Hj » i, i >m mj., j i nijii j« i , i i i nyiiL i , i» n iii . » ,^ii mjih, i ju n. jm, in 



113 



2 isomeric mixtures 75:25 and 60:40 trans ; c is was the most active against the 

 boll weevil. This insect appeared equally sensitive to all isomers of the 

 dichloro and dibromo pyrethroids. In field trials, FMC-45498 at 0.022 kg/ha 

 was effective against the tobacco budworm; at 0.11 kg/ha, it was effective 

 against boll weevils. 



210. De£in, G., and Lincoln, C. 1976. Various small plot tests on control 

 of cotton insects. Arkansas Farm Res. 25 (January/February) :1. 



This article and an earlier article present results of small plot tests on 

 cotton insect control. Some new chemical groupings show great promise in 

 sprays for bollworm-budworo control. Addition of the ovicide chlordlmeform 

 [Galecron or Fundal] improved performance of certain insecticides for worm 

 control, but not of others. There are promising new ovicides for egg kill of 

 bollworm-budworm. Microgranules, and possible conventional granules, gave 

 good bollworm-budworm control and promise certain fringe benefits. Alterna- 

 tives to the use of organic phosphate insecticides for boll weevil control 

 are in sight. 



211. DeMichele, D. W. ; Curry, G. L.; Sharpe, P. J. H.; and Barfield, C. S. 

 1976. Cotton bud drying: a theoretical model. Environ. Entomol. 5: 

 1011-1016. 



This paper presents a theoretical analysis of the rate of water loss from 

 abscised flower buds of cotton, Gossypium hirsutum L., under any given set of 

 environmental conditions. The bud drying model provides a link between larval 

 boll weevil, Anthonomus grandis Boheman, mortality, and crop environment. De- 

 rived from assumptions relating to diffusive water loss, the model shows ex- 

 cellent agreement with experimental resalf.s for buds ranging in initial weight 

 from 0.2-0.7 grams. Tlie bud drying model provides a means of calculating the 

 drying time of abscised cotton buds for any given microclimate. 



