Control of Heterodera schachtii with Foliar Application of Nematicides
AbstractFoliar applications of ethyl 4-(methylthio)-m-tolyl isopropylphosphoramidate (phenamiphos) or S-methyl 1-(dimethylcarbamoyl)-N-[(methylcarbamoyl)oxy] thioformimidate (oxamyl) retarded infection of sugarbeets by the sugarbeet nematode, Heterodera schachtii under greenhouse conditions. Maximum nematode control was obtained when treatments were applied previous to, or at the time of, inoculation of plants with the nematode. Consecutive foliar applications inhibited nematode development, with four applications giving greatest inhibition of maturation. A treatment with either phenamiphos or oxamyl at 2,000 [mu]g/ml (ppm) resulted in the greatest increase in plant growth, and 4,000 [mu]g/ml gave the best nematode control. A treatment of 4,000 [mu]g/ml of either phenamiphos or oxamyl was phytotoxic. However, this was due to container confinement of the chemical since phytotoxicity at this rate has not been observed under field conditions. Key words: Beta vulgaris, multiple treatment.
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