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204 



395. Helms, W. F. 1973. 1971 boll weevil control program in the High Plains 

 of Texas. Folia Entomol. Mex. 25-26: 74. (In Spanish, abstract only). 



A Reproductive Diapause Control program was conducted again in 1971 in the 

 High Plains and Rolling Plains of Texas. A major modification in the survey 

 phase was assignment of an area of 60-75 fields to a survey team with each 

 field checked once a week throughout the program. Previously, once a field 

 was found infested, no further survey was conducted, as the field was auto- 

 matically included in the program. Criteria for treatment of fields was esta- 

 blished as follows: Prior to September 20, fields below the Caprock were 

 treated when the punctured square count reached ten percent; and above the 

 Caprock, five percent. After September 20, these criteria were increased co 

 two percent and ten percent respectively. Fields with persistent populations 

 above the criteria level were treated at least once a week. Populations in 

 the control zone were very light in 1971. These light populations, plus the 

 establishment of treatment criteria, greatly reduced the aggregate acreage 

 treated. 379,544 acres were treated in 1971, as compared to 1,146,010 acres 

 in 1970. 



396. Henson, R. D.; Bull, D. L.; Ridgway, R. L. ; and Ivie, G. W. 1976. 

 Identification of the oxidative decomposition products of the boll 

 weevil pheromone, grandlure, and the determination of the fate of 

 grandlure in soil and water. J. Agric. Food Chem. 24: 228-231. 



The oxidation products of grandlure were isolated by column and thin-layer 

 chromatography. The compounds were identified by a combination of gas 

 chromatography, mass spectrometry, ir, and proton magnetic resonance analysis. 

 Two acids, two esters, and one aldehyde v/ere identified as oxidation pro- 

 ducts of the grandlure aldehydes; the grandlure alcohols were stable. Soil 

 and water persistence studies at 32 and 21''C showed that 98% of all compo- 

 nents were lost from soil with 24 h at 32*'C and that no grandlure remained 



