TOXICITY OF METALAXYL AGAINST PYTHIUM APHANIDERMATUM (EDSON) FITZPATRICK AND PHYTOPHTHORA PARACITICA VAR. NICOTIANAE (BREDA DE HAAN) TUCKER IN TOBACCO
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Date
1985
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AAU, Anand
Abstract
Toxicity of different formulations of metalaxyl viz. Apron 35SD, Ridomil 25WP, R+MZ 72WP and M+ZI 280FW was studied against Pythium aphanidermatum and Phytophthora parasitica var. nicotianae (in vitro and in vivo). Residue study of metalaxyl (Apron 35SD) was also carried out. Among the different concentrations of various metalaxyl formulations studied against Pythium aphanidermatum in vitro. Apron 35SD, Ridomil 25WP and R+MZ 72WP each at 100 ppm concentration gave cent per cent inhibition of fungus growth, while in vivo, soil drenching with Apron 35SD, Ridomil 25WP and R+mz 72Wp each at 100 ppm concentration effectively managed the daraping-off disease. In vitro study of various raetalaxyl formulations at different concentrations against Phytophthora parasitica var. nicotianae^ the results revealed that Apron 35SD at all the concentrations viz. 100, 10, 1 and 0.1 ppm, Ridomil 25WP at 100, 10 and 1 ppm, R+mz 72WP at 100 and 10 ppm and M+ZI 280FW at 100 ppm concentration completely checked the fungus growth. Regarding their effectivity in vivo, soil drenching with R+MZ 72 wp at 100 ppm concentration effectively managed the black-shank disease. Results obtained from residue study of metalaxyl (Apron 35SD at 3%) indicated that uptake of metalaxyl by tobacco seedlings was maximum (9040 ppm) at tenth day after seed germination while it was minimum (4700 ppm) at fifth day after seed germination.
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Plant Pathology, Agriculture, A Study