179 



summer of 197A near Temple, Texas.. Treatments providing the greatest degree 

 of control of the tobacco budworm were £-ethyl 0^-[A-(nethylthio) phenyl] S- 

 propyl phosphorodithioate (BAY NTN 9306) at a rate of 1.5 lb Al/acre and 

 carbaryl (SevimolS) + chlordimeform at 1.0 and 0.125 lb Al/acre. Other 

 treatments were comparable to the methyl parathion and monocrotophos stan- 

 dards. Chlorpyrifos gave quick knockdown of thrips and boll weevils but was 

 ineffective against the tobacco budworm. 



346. Harrell, E. A.; Perkins, W. D,; and Sparks, A. N. 1980. Improved equip- 

 ment and techniques for mechanizing the boll weevil larval rearing 

 system. Trans. ASAE 23: 1554-1556, 1563, 1580. 



Equipment and techniques have been improved for mechanizing the boll weevil 

 larval rearing system. The equipment is designed to form rearing trays from 

 plastic film, fill the trays with food, rapidly cool the food, place eggs on 

 the food, cover the eggs with a granular material, heat-seal a cover on the 

 tray, and shear trays as desired. Trays for rearing weevils are processed at 

 a rate that will provide slightly more than 106 weevils/h. A method of rear- 

 ing weevils without using granular materilas produced 85 percent as mar.y weevils 

 as were produced when using the granular materials. Also, an alternate tray 

 cover was tested, with satsfactory results, and costs one-third as much as 

 the cover previ'^usly used. 



347. ; Perkins, W. D.; Sparks, A. N.; and Moore, R. F. 1977. Mechanizing 

 techniques for adult boll weevil, Coleoptera: Curculionidae production. 

 Trans. AS.\E 20: 450-453. 



Equipment developed at the Southern Grain Insects Research Laboratory for 

 mechanized rearing of Heliothis zea (&oddie) has been modified for rearing 

 boll weevils, An thonomus crandis Boheroan. Plastic rearing trays are formed, 

 filled with diet, cooled, egged, sanded, covered, and sheared in a continuous 



