371 



to 1974. The outstanding research findings reported by aut'.iors of Federal and 

 State agencies are summarized here, including some, unpublished observations. 



727. . 1980. Highlights of the Cotton Insect Research and Control Conference. 

 Proc. 1980 Beltwide Cotton Prod.-Mech. Conf., pp. 18-20. 



After several hard winters the boll weevil made a comeback in most infested 

 states. Iniprovements were made in packaging and shipping irradiated boll 

 weevils. One in-field trap per acre detected 2 of 4 boll weevil clumps and 4 

 traps per acre detected 4 of 4 clumps in the F, generation, with both arrange- 

 ments detecting all of the reproducing weevil clumps in the F„ generation. 

 Infestations of bollworms and tobacco budworms were light to moderate. Traps 

 baited with new 7-component synthetic pheromone of the tobacco budworra captured 

 more moths than traps baited with virgin females. A new pyrethroid, AC22705, 

 and thiodicarb showed promise against Heliothis spp. For the second year the 

 cotton leafworm made its appearance in the midsouth and southeast. Infesta- 

 tions of the tarnished plant bug were higher and persisted longer into the 

 season than usual in the midsouth. The estimated Beltwide loss to the 1979 

 cotton crop caused by insects was estimated to be 8.7 percent. 



728. ,-and Cowan, C. B., Jr. 1972. Comparative yields of cotton in treated 

 and untreated plots in insect-control experiments in central Texas, 

 1939-1970. J. Econ. Entomol, 65: 480-481. 



In field experiments conducted for control of cotton insects in Central Texas 

 during the 32-year period 1939-1970, an average of 6 applications of insecti- 

 cides gave an increase in yield of 366 pounds of seed cotton per acre or 

 54.3%. 



