238 



460. Jones, S. E., and Parencia, C. R. 1968. Research - Behind the scenes with 



USDA. Cotton (Sept.): 18, 22-23, 25. 

 The complexity and significance of the cotton insect situation has been review- 

 ed and the research program briefly discussed, l^ith modest increases in appro- 

 priations, it has been possible to initiate much needed basic research. 

 Discoveries recently made and others yet to come may be expected to provide 

 new less expensive methods for controlling cotton insects and thus lowering 

 production costs. 



461. Keever, D. W. , Bradley, J. R. Jr. and Ganyard, M. C. 1977. Effects of 

 diflubenzuron (Dimilin) on selected beneficial arthropods in cotton 

 fields. Environ. Entomol. 6: 732-736. 

 Populations of the arthropod predators, Geocor is punctipes (Say), Nab is spp., 

 Hippodamia convergens Guerin, Coleomegilla maculata (DeGeer) , Orius insidiosus 

 (Say), Chrysopa spp., and Araneida, were monitored in cotton fields treated 

 with diflubenzuron, in cotton fields treated with conventional insecticides, 

 and in cotton fields to which no insecticides were applied. G. punctipes and 

 H. convergens were taken from both diflubenzuron-treated and untreated fields 

 to the laboratory to study oviposition and egg hatch. With the exception of 

 G_. punctipes , reduction of predator populations in diflubenzuron-treated fields 

 vs. untreated fields was not significant. This was in marked contrast to the 

 highly adverse effects of conventional insecticides upon the predator popula- 

 tions. For 6 days after collection, egg hatch in laboratory-held H. convergens 

 was significantly lower in females collected from diflubenzuron-treated cotton 

 fields than in those from untreated fields. Additional differences in fecundity 

 were not detected in the laboratory studies. 



