325 



captured from 1971 through 1975 were 8959, 3399, 2058, 1213, and 715, respec- 

 tively. Averages captured per trap per month ranged from 0-164.3. 



629. Minyard, J. P.; Hardee, D. D.; Gueldner, R. C. ; Thompson, A. C; Wiygul, 

 G.; and Hedin, P. A. 1969. Constituents of the cotton bud compounds 

 attractive to the boll weevil. J. Agric. Food Chem. 17: 1093-1097. 



Essential oil from buds of the cotton plant ( Gossypium hirsutum L. CV Deltapine 

 Smoothleaf) was fractionated by several procedures. Mixtures and single com- 

 pounds thus obtained were bioassayed for plant attractancy to the boll weevil, 

 Anthonomus grand is Boheman. Compounds present in cotton and active as compo- 

 nents of the plant attractant complex are (-)-a-pinene, (-)-limonene, (-)-3- 

 caryophyllene, (+)-3-bisabolol (a sesquiterpene alcohol reported only in cotton 

 thus, far), caryophyllene oxide, and two as yet unidentified sesquiterpenoids. 

 The boll weevil-cotton plant attractant complex thus appears to be a mixture of 

 many compounds. An aqueous mixture of 10. 3, 100, 100, and 30 p.p.b., respec- 

 tively, of commercial (+)-u-penene and (+)-limonene, cotton bud oil (-)-B- 

 caryophyllene and (+)-8-bisabolol, and synthetic caryophyllene oxide from cotton 

 (-)-3-caryophyllene, is 124% as attractant in laborafory assays as the best 

 available attractant mixture from cotton buds.. This synthetic mixture remains 

 highly attractive to boll v;eevils at concentrati,ons 30-fold higher and 10-fold 

 lowei^^, 



630. Mistric, W. J., Jr. 1968. Comparative effect of the boll weevil on the 

 productivity of Coker 100 W and Deltapine 15 cotton in North Carolina. 

 J. Econ. Entomol. 61: 284-285. 



Fruiting and yield characteristics of semideterminate Coker 100 W and nondeter- 

 minate Deltapine 15 cotton were compared under conditions of (1) heavy boll 

 weevil, Anthonomus grand is Bohemai , infestation and (2) virtually on infesta- 

 tion. Varietal differences in the trends in fruiting and yield were similar 



