170 



fordil Hemsl. The same substance (or a related substance) was present in more 

 concentrated form in tung oil. The deterrent effect of the substance(s) was 

 greater than that produced by a water €;xtract of calyxes from buds of Rose-of- 

 Sharon, Hibiscus syriacus L. The subrtance is readily soluble in water, resis- 

 tant to moderate heat, and volatilizes slowly. A 2- to 15-fold decrease occurred 

 in the number of feeding punctures made by boll weevils (compared with the con- 

 trols) when cotton squares (buds) were dipped in a filtrate of water homogenized 

 with tung meal that had been expeller-extracted. This deterrent effect was less 

 when a filtrate of a homogenate of water and meal extracted by using hexane as a 

 solvent was used and was greater when pure tung oil was used. In studies of 

 serial dilution, the increase in deterrent effect was directly proportional to 

 the Increase in concentration of the filtrate. Antennectomy of boll weevils did 

 not reduce the deterrent effect. 



326. ; Graves, T. M. ; McKibben, G. H. ; Johnson, W. L.; Gueldner, R. C.; 

 and Olsen, C. M. 1974. A slow-release formulation of grandlure, the 

 synthetic pheromone of the boll weevil. J. Econ. Entomol. 67: 44-46. 



An experimental slow-release formulation of grandlure, the synthesized 

 pheromone of the male of Anthonomus grand is Boheman, proved to be 90-100% 

 as effective in the field as male weevils*when the weevils and the formu- _ 

 *T:atix3n were Leo Led in the field for 7 days or longer. The forn^ilation 

 was superior to foinaulations used previously and was used effectively in 

 traps for survey and research and in the Pilot Boll Weevil Eradication 

 Experiment in S. Mississippi. 



327. ; Lindig, 0. H.; and Davich, T. B. 1971. Suppression of populations 

 of boll weevils over a large area in west Texas with pheromone traps 

 in 1969. J. Econ. Entcmol. 64: 928-933. 



Infestations were not found' in 17 of 34 cotton fields in west Texas in which 



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