271 



for 5 weeks, remain at a plateau for 3 weeks, and then drop. 



515. : ; Boyer, W. P.; and Miner, F. D. 1975. The evolution of insect pest 

 management in cotton and soybeans: past experience, present status, 

 and future outlook in Arkansas. Environ. Entomol. 4: 1-7. 

 Soybeans and cotton occupy vast acreages of the alluvial soils of eastern Arkansas. 

 In this greatly simplified agro-ecosystem, soybeans are usually grown without sus- 

 taining economic damage from insects. Serious outbreaks do occur, however, and 

 on the average 15% of the acreage is treated annually. Much of the cotton in 

 northeastern Arkansas is not treated. Outbreaks of bollworm and boll weevil 

 regularly require insecticide usage in central and southern Arkansas. Insect 

 pest surveys and individual field scouting are used as the basis for determining 

 the need for insecticides on both crops. This insect pest management system has 

 been 50 years in the making in Arkansas. Current research in various areas, 

 including innovative practices, should lead to improvement in the system. In- 

 depth studies of all aspects of the several agro-ecosystems are essential for 

 long-term progress in i ^ct pest management. Given professional dedication 

 by entomologists, wi_n support from the agricultural community, industry, 

 federal and state governments, and the public, progress should accelerate 

 rapidly. •.*. 



^f-^ — ^-— -' 



516. ; Dean, G.; Waddle, B. A.; Yearian, W. C; Phillips, Jt R.; and 



Roberts, L. 1971. Resistance of fcego-type cotton to boll weevil and 



bollworm. J. Econ. Entomol. 64: 137.6-1327. 

 Frego-type cotton refers to a mutant form with rolled bracts in contrast to the 

 flat and more-or-less enclosing braces of normal plants. Research at the 

 Arkansas Agricultural Experiment Station on the rolled bract mutation as a 

 source of insect resistance has been carried on since 1958. Hunter et al. (1965) 

 reported it to be the most' promising source of resistance to boll weevil, 



