324 



traps. A similar formulation containing 40 mg grandlure was effective for 8 

 weeks when it vas exposed in Leggett traps. Unbaited Leggett traps caught some 

 weevils; unbaited plastic traps did not. ^ • . 



626. ; Cross, W. H.; and Johnson, W. L. 1978. Boll weevil: detection and 

 monitoring of small populations with in-field traps. J. Econ. Entomcl. 

 71: 29-30. 



In-field traps were superior to other techniques for detecting very low popula- 

 tions of Anthonomus grandis Boheman in cotton fields. Five, 10, 15, 20, and 

 25 in-field traps/ha were compared in an isolated cotton field in Arkansas. 

 Only one punctured square and no live weevils were found in hand examinations 

 during the experiment. No weevils or punctured squares were found with an insect 

 collecting machine. A total of 25 overwintered weevils and 71 field generation 

 weevils was captured with in-field traps from May 26-Sept. 7. Twenty-five 

 traps/ha captured the majority of weevils caught during the test. 



627. ; Lane, H. C; and McCoy, J. R. 1980. Narrow row cotton in Mississippi: 

 effect on insects and yield. J. Ga. Entomol. Soc. 15: 109-114. 



Infestations of cotton pests were more severe on cotton planted early in the 

 season in narrowly spaced rows thaniin cotton planted at normal density, but 

 were not more severe when the cotton was planted in mid- or late-season. 

 However, in some J;ests yields from cotton planted densely were slightly 

 greater than, and in other tests similar to, yields from cotton planted at 

 nonnal density. 



628. , and McCoy, J. R. 1978. Boll weevils: seasonal response over five 

 years to pheromone baited traps. J. Econ. Entomol. 71: 730-731. 



In a 5-yr study in the hill area of Mississippi, boll weevils, Anthonomus grandis 

 grandis Boheman, were captured every month of each year, except March 1974. The 

 largest numbers were captured in Oct. and the smallest numbers in Mar. Totals 



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