LV forroulationB and 3 water-diluted emulsif iable concentrates were applied to 

 15- to 25-acre unreplicated plots with a Piper PA18A aircraft equipped with 

 conven ional boom, LV boom, and Micronair Rotary Atomiser application systems. 

 TliC experiment was designed to compare the effectiveness of the LV materials 

 with that of a standard treatment, Resjlts in 1965 showed that the LV 

 concentrate of the insecticides commonly recommended gave adequate control. 

 These n;aterials performed as well as the standard treatment. The undiluted 

 materials that did not give satisfactory results at the rates used were Azodrin 

 (3-hydroxy-N-methyl- cis- crotonamide dimethyl phosphate), azinphosmethyl , 

 malathion-Abate (0, 0^-dimethyl phosphorodithioate (), ^-diester with 4, 

 4'-thiodiphenol) , raalathion, and diazinon. In 1966, similar tests were 

 conducted using essentially those materials found to be satisfactory in 1965. 

 Results revealed that all the LV materials gave satisfactory control and were as 

 effective as the standard treatment. Strobane (terpine polychlorinates (65% 

 chlorine) )-DDT-methyl parathion and Strobane-methyl parpthion, both applied at 

 1/2 gal of concentrate/acre, appeared to be slightly more effective than the 

 standard water-diluted treatment. 



5. Adams, C. H., and Cross , W. H. 1967. Insecticide resistance in 

 Bracon mellitor , a parasite of the boll weevil. J. Econ. Hntomol. 



60: 1016-1020. 



•~ 



The potential resistance to insecticides of Bracon mellitor Say was determined 

 by treating each of 5 test groups for 5 or more generations with an organic 

 insecticide commonly used for the control of cotton insects. Fourfold increases 

 in tolerance were noted in groups treateo with DDT, carbaryl, and parathion. A 

 group treated with equal parts of DDT and toxaphene had resistance 8 times that 

 of the original generation. Only a group treated with toxaphene alone showed no 

 jsignificant increase in tolerance. The results demonstrated that the pa-^asite 



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