177 



rences between incidence of thrips, Frankliniella spp., ca pilose and 

 smoother cottons were not detectable. 



( 



3A1. ; Hipp, B. W. ; Dupnik, T. I>. ; and Fuchs, T. W. 1976. Cotton 

 density, variety and chemical eleme- •- status related to insect 

 numbers and damage. Southwest. Entomol. 1: 136-140. 

 During 1971 and 1972, an experiment was conducted comparing plant densities 

 of 29,000 and 84,000/acre for each of 4 varieties Insect numbers, damage, 

 and element status were compared. Plant density did not affect fruiting, 

 arthropod numbers, insect damage or concentration of elements. Several 

 differences were found in element concentrations due to variety. Results 

 suggested that element levels in the plant might contribute to insect levels 

 among varieties. 



342. ; Huffman, F. R. ; Wolfenbarger, D. A.; and Davis, J. W. 1977. 

 Insecticidal activity of Alpha- cyano-3-phenoxybenzyl pyrethrolds 

 against the boll weevil and tobacco budworm. Southwest. Entomol. 2: 

 42-45. 

 A substituted phenyl acetate. Shell Development SD-43775 (cyano (3-phenoxy- 

 phenyl) methyl 4-chloro -alpha- (1-methylethyl) benzeneacetate) and a pyre- 

 throid, SD-41706 (cyano (3-phenoxyphenyl)methyl 2, 2, 3, 3,-tetramethylcyclo- 

 propane carboxylate) were tested in the laboratory and field against the 

 tobacco budworm, Heliothis virescens (F.), and the boll weevil, Anthonomus 

 grand is Boheman. SD-43775 was effective against the tobacco budworm at 

 0.1 lb/acre in the field and SD-41706 at 0.2 lb. Resistance of the tobacco 

 budworm to SD-43775 was shown by a 21X difference in LD^-^'s between a labora- 

 tory-susceptible and a field collected strain. SD-43775 was found effective 

 against the boll weevil at 0.1 lb/acre. 



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