NAHONAL AGRICULTU v_. „.«flARY 



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CATALOGING THtF 



274 



about frora the beginning of the 20th century. The easy probleins have been 

 largely solved and the difficult ones are being worked on. Perfection will 

 never be reached nor is there any reasonable hope that control of most pest 

 insects can be achieved without a considerable use of insecticides. Ve would 

 be derelict in our duties not to continue to develop new insecticides and 

 acaricides and to recomnend the use of effective pesticides which present 

 verv limited hazard to the environment and to man. 



519. , and Phillips, J. R. 1970. The impact of resistance to insecticides 

 on cotton insect problems in Arkansas. Arkansas Acad. Sci. Proc. XXIV: 

 66-67. 



In 25 years of heavy insecticide usage on cotton in Arkansas, resistance has be- • 

 come a problem with several pest insects and mites to the 3 principal groups of 

 insecticides and miticides: the chlornated hydrocarbons, the organophosphorus 

 compounds, and the carbamates. Development of control measures, chemical or 

 otherwise, is not proceeding at a sufficiently rapid pace to stay ahead of the 

 problem posed by insect resistance to insecticides. 



520. , and Vaddle, B. A. 1966. Insect resistance of frego-type cctton. 

 Arkansas Farm- Res. X\'(Jan. /Feb. ) : 1. 



Significant reductions in surviving worms and in damaged squares were associated 

 with the Frego plantings. Length of recovered worms was essentially the same for 

 both cottons, indicating that the Frego plants were nutritionally adequate. Boll- 

 worms did not shift their site of greatest activity to areas away from bracts on 

 the Frego plants. In fact, most of the worms recovered in both varieties were 

 associated with the fruits (squares, bolls, and blooms). Resistance to boll 

 weevil was verified in the Frego planting. Two weevil releases were made in the 

 Frego and check plantings. Each consisted of 50 male and 50 feraalv'' weevils, 

 which were dispersed at random over 10 rows 100 feet l.^ng. The low infestations 



