29. Bull, D. L., Lindquist, D. A., and 

 Hacskaylo, J. Absorption and metabolism of 

 dimethoate in the bollworm and boll weevil. 

 Jour. Econ. Ent. 56: 129-134. 1963. 



P 32 labeled dimethoate was absorbed and 

 excreted rapidly by fifth-instar bollworm larvae 

 and adult boll weevils. These insects absorbed 

 54.2 and 74.5 percent of topically applied di- 

 methoate, respectively, after 24 hours. The 

 bollworm larvae excreted 76.2 percent of an 

 injected dose after 24 hours. The in vivo me- 

 tabolism of P 32 labeled dimethoate in adult boll 

 weevils, fifth-instar bollworm larvae, and cot- 

 ton seedlings was characterized qualitatively 

 and quantitatively through the use of paper 

 chromatography, autoradiography, and stand- 

 ard radioassay procedures. Dimethoate and 11 

 metabolites were detected in various insects and 

 plant extracts. In bollworms the principal ini- 

 tial sites for hydrolytic cleavage of the dimeth- 

 oate molecule were the carbonyl-nitrogen 

 bond and the sulfur-carbon bond. The oxygen 

 analog of dimethoate was formed in both plants 

 and insects, but it was broken down rapidly by 

 the insects to nontoxic products. 



30. Bull, D. L., Lindquist, D. A., and 

 House, V. S. Laboratory and greenhouse ex- 

 periments with a new series of systemic insec- 

 ticides. Jour. Econ. Ent. 57 : 112-116. 1964. 



Five American Cyanamid Company experi- 

 mental organophosphorus systemic insecti- 

 cides, compounds 43064, 43356, 47031, 47071, 

 47470, were used on cotton insect pests. Topical 

 treatments of adult boll weevils indicated that 

 all five compounds were more toxic than phor- 

 ate, but dosage-mortality curves were unusu- 

 ally flat. Seed treatments of cotton with 

 compounds 43064, 43356, and 47071 gave 

 excellent control of adult boll weevils in green- 

 house experiments for 10 to 11 weeks. Treat- 

 ment with the phorate standard controlled 

 weevils for only 6 weeks. Field experiments 

 indicated that compound 43064 was no more 

 effective than phorate for control of aphids, 

 thrips, or boll weevils. 



31. Bull, D. L., Lindquist, D. A., and 

 House, V. S. Synergism of organophosphorus 

 systemic insecticides. Jour. Econ. Ent. 58: 

 1157-1159. 1965. 



Bidrin, dimethoate, CL-43064, and phorate 

 were tested in combination with 16 chemicals 

 on their ability to enhance the chemical's con- 

 trol of the boll weevil and other major chewing 

 insect pests. 



Applications were made topically to the in- 

 sects and in four treatments to the plant or 

 seed. Certain synergists increased the activity 

 of the insecticide against the boll weevil when 

 applied topically, but attempts to extend these 

 combined treatments to on-plant control were 

 not successful. 



32. Burgess, E. D. Control of the boll 

 weevil with technical malathion applied by air- 

 craft. Jour. Econ. Ent. 58: 414-415. 1965. 



On basis of favorable results obtained 

 against grasshoppers, undiluted technical mal- 

 athion was applied by aircraft at rates as low 

 as 9 fluid ounces per acre for control of the boll 

 weevil. Eight ounces of methyl parathion and 

 4 ounces of Guthion each applied in 3 gallons 

 of water per acre served as standards. Results 

 showed that all rates of technical malathion 

 used without dilution were apparently at least 

 equal in performance to the standards. 



33. Burks, M. L., and Earle, N. W. Amino- 

 acid composition of upland cotton squares and 

 Arizona wild cotton bolls. Jour. Agr. Food 

 Chem. 13: 40-43. 1965. 



Protein and free amino acids from two sizes 

 of cotton flower buds were analyzed by ion ex- 

 change chromatography to provide information 

 to be used in the development of artificial diets 

 for the boll weevil. Amino acids from several 

 parts of the bud were analyzed ; the most com- 

 plete data were obtained from the anthers, 

 since these constitute the adult weevil's main 

 source of food. Only 9.4 percent of the total 

 amino acids in the anthers occurred in the free 

 form; of these, asparagine, glutamine, and pro- 

 line were present in the greatest amounts. 

 Amino acids in the protein were present in 

 amounts comparable to those in other plant 

 proteins, with relatively large quantities of 

 aspartic and glutamic acids, leucine, alanine, 

 glycine, and lysine. 



34. Burt, E. C. Mechanical destruction of 

 fallen boll weevil infested cotton squares. 

 Assoc. South. Agr. Workers Proc. 61: 51. 

 1964. (Abstract.) 



This is a progress report on the development 

 of a machine for the destruction of boll weevils 

 in infested cotton squares. 



Few major mechanical difficulties were en- 

 countered in field tests with a flail-type tractor- 

 mounted machine. Boll weevil control obtained 

 was comparable with insecticide treatments 

 as long as the migration of the insect was not 

 a factor in the experiments. 



The overall square pick-up of the machine 

 was 84.2 percent, with an efficiency of 92 per- 

 cent in the cotton middle area. The major 

 improvement needed in the design is a more 

 efficient method of moving the fallen squares 

 from underneath the plants. 



35. Butt, B. A., and Keller, J. C. Suscep- 

 tibility of boll weevils to some phosphorodi- 

 thioic acid esters. Jour. Econ. Ent. 54: 813. 

 1961. 



Seventeen esters were tested against boll 

 weevils reared from cotton squares. Five of the 

 esters were more toxic than dieldrin; three 

 were about equal to dieldrin; three were less 



