411 



Anthonomus grand is Boheman, were made during the 1976 growing season. Marked, 

 native boll weevils were released at regular intervals near traps located in 

 cotton and in rangeland. The response of weevils to traps located in range- 

 land was relatively consistent throughout the test period with a mean seasonal 

 recapture rate of 11.2 percent. The recovery rate of weevils released in 

 cotton during the pre-square and early squaring period as 10.4 percent but 

 trap efficiency averaged less than 3 percent during the mid and late season 

 periods. 



805. ; White, J. R. ; Carroll, S. C; and Pruitt, G. R. 1980. Pheromone 

 trap index system for predicting need for over 'intered boll weevil 

 control. J. Econ. Entomol. 73: 806-810. 

 Studies were conducted during 1977-79 to determine if grandlure baited traps 

 could be used to predict the need to treat for overwintered Anthonomus grandis 

 grandis Boheman. A positive relationship was established between the mean 

 number of overwintered weevils captured per trap per field just prior to the 

 appearance of squares suitable for oviposition and the percent oviposition 

 damaged squares during the early 1/3-grown square period. A trap index thres- 

 hold was developed and applied to actusi. field situations. The accuracy of the 

 ^tiap-index, system in determining the need for overwintered boll weevil control 

 was compared to conventional field sampling. The trap index method was more 

 accurate than field scouting in providing a warning of overwintered weevil 

 infestation before squares of a suitable size for oviposition were present. 

 They system was equally effective in indicating when overwintered weevil 

 control was unnecessary. 



