Control of Some Insects Which Damage Roots of Sweet Potatoes in the Field1

Publisher Website
Google Scholar
Abstract
Field experiments were conducted for purposes of testing effectiveness of heptachlor, aldrin, chlordane and dieldrin in the control of the following soil insects which affect sweet potato roots in the field white grubs (Phyllophaga spp.), larvae of the banded cucumber beetle (Diabrotica balteata) and fleabeetle larvae (mostly Chaetocnema confinis). Granulated materials and emulsion concentrate sprays were mixed into the top 3 to 4 inches of soil. Insecticide-fertilizer mixtures were placed 4 to 6 inches deep in row centers. Other applications were made with insecticides in plant starter-water. Dosages ranged from 1 to 3 lb. technical material/Acre. All chemicals gave good control approaching 100% undamaged sweet potato roots when infestations were 50% or less in the checks. When injury in the checks neared 100%, differences in effectiveness among methods of applications became pronounced. Granulated and spray formulations continued to give excellent control (generally 90% or better). Insecticide-fertilizer mixtures resulted in non-economic control. Incidence of the sweet potato weevil (Cylas formicarius elegantulus) was also reduced when infestations in checks were light (10-15%). Studies on residual effect of soil treatments with granulated chlordane and aldrin indicated that economic control of soil insects cannot be obtained for more than 2 years after initial application.

This publication has 1 reference indexed in Scilit: