^ . ■ 



493 



975. ; Mitlin, N.; Thompson, A. C; and Lincig, 0. H. 1975. Free amino 



acid levels in the boll weevil (Coleoptera: Curculionldae) : the effect 

 of five different diets. Comp. Biochem. Physiol'. 49B: 663-667. 

 1. The levels of eighteen free amino acids were determined i.: f^ve groups of 

 5-day-old male boll weevils. 2. Each of the groups of boll weevils had fed, 

 from emergence, on one of three artificial diets, on cotton bolls or on cotton 

 squares (buds). 3. Square-fed boll weevils were compared statistically with 

 the other groups of weevils. 4. Glutamic acid was elevated in all three groups 

 fed artificial diets. 5. Proline and tyrosine were elevated in two groups fed 

 artificial diets; alanine, glycine, arginine, histidine, and tryptophan were 

 elevated in at least one of these groups. Alanine was decreased in cne of the 

 groups fed artificial diets. 6. Valine, glycine, isoleucine, leucone, threonine, 

 phenylalanine, aspartic acid and arginine were elevated in boll-fed boll weevils; 

 methionine was aecreased. 



976. Wolfenbarger, D. A. 1977. Boll weevil, bollworm, and tobacco budworn, 



and fruiting structures of the cotton plant: number of plants that must 

 be sampled at different square populations and percentage damaged. J. 

 Econ. Entomol. 70: 791-793. ^^ 

 Pl ants at different stages of growth i.n 0.4 ha of cotton were sampled by the 

 grid, X pattern, and area systems to estimate number of squares, percentage 

 squares damaged by the boll weevil, A nthonomus grand is Boheman, and percentage 

 squares, flowers, and bolls damaged by Heilothis spp. No system was clearly 

 superior to the others, but fewer plants had to be sampled by the grid and X 

 systems to achieve comparable results with those from the area system. To 

 estimate damage done by Heliothis spp. and the boll weevil, totals of 100-1000 

 plantF had to be sampled. Only 4-20 plants were needed when sampling for squares, 

 and -:5-135 for flowers. 



