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Evaluation of Chlorpyriphos 20 EC Against Psyllid Diaphorina Citri Kuwayama in Citrus

Evaluation of Chlorpyriphos 20 EC Against Psyllid Diaphorina Citri Kuwayama in Citrus

J. Niranjanadevi,Dr. N. Ganapathy

Journal Title:
Abstract


Experiment conducted to test the bioefficacy of chlorpyriphos 20 EC against psyllid , Diaphorina citri Kuwayama in citrus showed that end of two rounds application of chlorpyriphos 20 EC @ 250, 500, 750, 1000 ml/ha, Dursban 20 EC 500 ml/ha and dimethoate 30 EC 500 ml/ha spray at 14 days interval registered low mean numbers of nymphs 1.83 (86.66% reduction over control ), followed by chlorpyriphos 20 EC 750 ml/ha 1.99 (85.73% reduction), chlorpyriphos 20 EC 500 ml/ha 2.40 (82.92% reduction), Dursban 20 EC 500 ml/ha 2.73 (80.49% reduction). Dimethoate 30 EC 500 ml/ha 3.66 (73.67% reduction) and chlorpyriphos 20 EC 250 ml/ha 3.82 (72.56% reduction) were less effective as against control (13.91). Chlorpyriphos 20 EC 1000 ml/ha recorded the maximum yield of 1.75 kg/tree followed by chlorpyriphos 20 EC 750 ml/ha (1.73 kg/tree).

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