INFLUENCE OF WATER AND SOIL-TEMPERATURE ON THE CONCENTRATION AND EFFICACY OF PHENAMIPHOS OR CONTROL OF ROOT-KNOT NEMATODES

  • 1 January 1981
    • journal article
    • research article
    • Vol. 13  (2) , 148-153
Abstract
Field plots of Tifton loamy sand were treated with phenamiphos for control of root knot nematodes in a multiple-crop system of turnips [Brassica rapa], field corn [Zea mays ssp. mays] and southern peas [Vigna unguiculata]. Preplant applications of phenamiphos protected roots of turnips and corn from damage by root-knot nematodes. Concentrations of phenamiphos at application in the 0-15 cm soil layer were near 6 .mu.g/g on turnips and near 4 .mu.g/g on corn and southern peas. After 30 days, concentrations were approximately 1 .mu.g phenamiphos/g of soil for all crops. Concentrations of 2.0-3.8 .mu.g phenamiphos/g of soil for 9-day duration appeared adequate for control of root-knot nematodes on field corn and southern peas in this multiple-crop system. Stepwise regression analyses indicated that 31, 62 and 22% of the variations in concentration of phenamiphos in the soil planted to turnips, corn, and southern peas, respectively, were attributable to the amount of water that the plots received. Soil temperature had no effect on concentrations of phenamiphos.