292 



558. , and Wolfenbarger, D. A. 1969. Methyl parathion, toxaphene, and DDT 

 used alone and in coc^blnations for control of several cotton insects. 

 J. Econ. Entomol. 62: 1249-1250. 



The 3-way mixture of toxaphene + DDT + methyl parathion gave the best control of 

 tobacco budworm, pink bollworm, and the highest increase in yield. Toxaphene + 

 methyl parathion, toxaphene + DDT and DDT + methyl parathion were about equally 

 effective. However^ none of the treatments gave adequate control. Toxaphene, 

 DDT, and methyl parathion used alone were ineffective, none of the treatments 

 reduced significantly the percent squares infested by the boll weevil. 



559. , and D. A. Wolfenbarger, D. A. 1970. Insecticides for control of 

 four cotton insects in 1968. J. Econ. Entomol. 63: 1324-1325. 



In Test 1, EPN gave the best control of the tobacco budworm and bollworm. EPN 

 + methyl parathion, methyl parathion, and toxaphene + DDT + methyl parathion 

 were less effective and malathion + methyl parathion was ineffective. However, 

 none gave adequate control of these 2 insects and the boll weevil. The mixture 

 of toxaphene + DDT + methyl parathion gave the best reduction of light popula- 

 tions of pink bollworms. In Test 2, General Chemical GC-6506 (dimethyl p- 

 (methylthio) phenyl phosphate), DuPont 1642 (methyl N-(carbomoyloxy) thioacetimi- 

 date) , carbofuran, VCS-506 (0-(4-bromo-2-5-dichlorophenyl) 0-methyl phenylphos- 

 phonothioate) and Union Carbide UC-34096 (4-[ [ (dimethylamino) methylene] amino ]- 

 intolyl methylcarbamate hydrochloride) , and methyl parathion did not give ade- 

 quate control of the bollworm and tobacco budworm but all of the materials 

 reduced the infestations of boll weevils below that of the check. In Test 3, 

 all insecticides gave a significant increase in yield over check though methyl 

 parathion EPN was significantly better than all other insecticides and methyl 

 parathion produced better yields than methyl parathion + parathion, monocrotophos 

 alone, or monocrtophos + methyl parathion. 



