COMPATIBILITY OF NEWER INSECTICIDES AND FUNGICIDES AND THEIR EFFECT ON MAJOR INSECT PESTS AND DISEASES OF RICE
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Date
2016
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Acharya N.G. Ranga Agricultural University, Guntur
Abstract
The present studies were carried out in the laboratory of Krishi Vigyan Kendra, Nellore and field studies at Agricultural Research Station, Nellore during rabi, 2012-13, 2013-14 and 2014-15 with an objective to evaluate physical compatibility, phytotoxic incompatibility and bio-efficacy of pesticides combinations against pests and diseases of rice.
The physical compatibility of five insecticides viz., flubendiamide, rynaxypyr, cartap hydrochloride, buprofezin and profenophos and three fungicides viz., tricyclazole, hexaconazole and propiconazole along with pH were evaluated with jar compatibility test. Out of the 15 combinations of insecticides and fungicides tested, neither foaming nor sedimentation occurred indicating that all the 15 combinations were physically compatible. The pH of pesticide combinations slightly varied with some combinations, showing slightly alkaline reaction, some showing slightly acidic reaction, while remaining neutral in reaction.
The phytotoxic incompatibility due to combination of insecticides and fungicides on rice showed no phytotoxic symptoms such as injury to leaf tip, yellowing, wilting, necrosis, vein clearing, epinasty and hyponasty of leaves.
Name of the author K. PULLAM RAJU
Title of the thesis
“Compatibility of newer insecticides and fungicides and their effect on major insect pests and diseases of rice” Degree to which it is submitted Doctor of Philosophy in Agriculture Faculty Agriculture Department Entomology Chairperson Dr. P. RAJASEKHAR University Acharya N.G. Ranga Agricultural University Year of submission 2015
The bio-efficacy of insecticide and fungicide combinations against leaf folder, Cnaphalocrocis medinalis and stem borer, Scirpophaga incertulas revealed that the insecticides flubendiamide and rynaxypyr were highly effective against these pests and their combinations with fungicides in no way undermined the efficacy when mixed indicating their compatibility.
The per cent disease index (PDI) of leaf and neck blast was effectively reduced by tricyclazole, while sheath blight and stem rot were effectively controlled by hexaconazole and propiconazole. Even the combination with insecticides does not reduce the effectiveness indicating compatible reaction.
The detrimental effects of insecticides, fungicides and their combinations were tested by observing most occurring predators like spiders and coccinellid beetles, which revealed that straight and combination treatments had no effect on natural enemies population.
The most effective treatments of insecticide and fungicide namely, flubendiamide, rynaxypyr, flubendiamide + tricyclazole, flubendiamide + hexaconazole, flubendiamide + propiconazole, rynaxypyr + tricyclazole, rynaxypyr + hexaconazole and rynaxypyr + propiconazole along with herbicide, cyhalofop-Butyl were tested for physical compatibility, phytotoxic incompatibility and bio-efficacy under field conditions, which revealed that they were highly compatible with no phytotoxic effects.
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D5337
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