INFLUENCE OF CLIMATE AND CROPPING PATTERNS ON THE EFFICACY OF ETHOPROP, METHYL-BROMIDE, AND DD-MENCS FOR CONTROL OF ROOT-KNOT NEMATODES

  • 1 January 1980
    • journal article
    • research article
    • Vol. 12  (1) , 33-39
Abstract
Field plots of Tifton loamy sand were treated with methyl bromide, DD-MENCS, or ethoprop for control of root-knot nematodes, Meloidogyne incognita, in a multiple cropping system of turnips [Brassica rapa], field corn [Zea mays ssp. mays] and southern peas [Vigna unguiculata]. Annual applications of methyl bromide and DD-MENCS in Nov. or Dec. suppressed nematode numbers to very low levels through Sept., but numbers increased in the following Oct., Nov. and/or Dec. No benefit was found from ethoprop applied to DD-MENCS-treated plots before the planting of each crop. Nematode numbers were not significantly suppressed by ethoprop alone. Concentrations of ethoprop in the 0-15-cm soil layer were near 6 .mu.g/g at application but were < 1 .mu.g/g of soil 5 days later on corn and southern peas and 30 days later on turnips. Ethoprop concentrations of 4.6-5.6 .mu.g/g of soil are too low for adequate control of root-knot nematodes on field corn and southern peas in multiple cropping systems. Stepwise regression analyses indicated that 81% and 36% of the variations in concentration of ethoprop in the soil were attributable to the amount of water that the plots received when the maximum soil temperature ranged 10.degree.-19.degree. C and from 31-41.degree. C, respectively, and that 11% was attributable to the maximum soil temperature within the temperature range of 17-33.degree. C.

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