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Chemical control of coffee coffea arabica cultivar puerto rico selecto nematodes in seedbeds in puerto rico


Chemical control of coffee coffea arabica cultivar puerto rico selecto nematodes in seedbeds in puerto rico



Journal of Agriculture of the University of Puerto Rico 64(4): 474-481



ISSN/ISBN: 0041-994X

Pre-plant soil treatments with granular formulations and foliar sprays with the nematocides phenamiphos (Nemacur), oxamyl (Vydate) and fensulfothion (Dasanit) reduced populations of Meloidogyne incognita and Pratylenchus coffeae in coffee (C. arabica L.) cv. Puerto Rico Selecto roots. Significant (P = 0.05) increases in growth and development of the treated plants were obtained in the greenhouse. Best results were obtained with 11.20 kg ai[active ingredient]/ha of phenamiphos applied to the soil 15 days prior to planting, combined with foliar sprays of 1.12 kg ai/ha of the same systemic nematocide 15 days after transplanting or 2 foliar sprays with 0.56 kg ai/ha applied at intervals of 30 days; 0.56 kg ai/ha of oxamyl applied to the foliage 30 and 60 days after transplanting; and 4 granular soil applications of 300 mg of fensulfothion at 30-day intervals. Dipping roots in a solution containing 400 ppm of phenamiphos and 600 ppm of oxamyl also reduced nematode populations in roots and soil. Significant difference in root-knot index were found among those treatments and the controls, but plant growth was not affected. The higher dosages (2.24 kg ai/ha) of phenamiphos and fensulfothion when applied to the leaves twice after transplanting were phytotoxic to the coffee seedlings resulting in early defoliation, but not killing the plants.

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