262 



498. Leggett, J. E. 1979. Boll weevil: some new concepts in trap design and 

 evaluation of trap efficiency. Environ. Entomol. 8: 70-72. 



Traps that captured boll weevils, Anthonomus grand is |'.rnndis Boheman, alive were 

 more effective than traps requiring an adhesive. A thixotropic adhesive was con- 

 venient to work with but did not weather satisfactorily. A trap that turns with 

 a slight breeze did not capture more weevils than stationary traps. A latin 

 square in time experimental design was effective in removing variation of mean 

 weevil capture due to effects of season and trap location when trap designs were 

 compared around a cotton field. A commercial trap based on the design of the 

 Leggett trap was effective in capturing weevils. Pigmented adhesive sprayed on 

 a cotton plant was ineffective in capturing boll weevils that responded to grand- 

 lure. 



499. . 1980. Boll weevil: competitive and non-competitive evaluation of 

 factors affecting pheromone trap efficiency. Environ. Entomol. 9: 416-419. 



The effect of trap heights above soil surface was determined when traps of diffe- 

 rent heights were competing to attract released boll weevils, A.nthonomus grandis 

 Boheman, and where the heights were separate and not competing for capture of the 

 same weevils. Other factors compared. din the same way were trap color, trap design, 

 gra ndlure concentration, and ratio of the 4 grandlure components. These tests 

 were conducted to determine the degree of bias that may result when trap factors 

 compete for a natural field population of boll weevils. The importance of trap 

 height, color, design and grandlure concentration was less in noncompetitive 

 tests; however, 30:40:30 and 50:33:17 ratios of grandlure co^..ounds I:I1:III&IV 

 were equally effective in both comparisons. 



500. ; Cleveland, T. C; and Scott, W. P. 1972. Comparison of several 

 insecticide combinations for control of Heliot his spp. J. Econ, Entomol. 

 65: 1182-1183. 



