EL-SHEHABY, A. (1995). CONTROL OF ONION SMUT BY SEED TREATMENT. Egyptian Journal of Agricultural Research, 73(2), 307-314. doi: 10.21608/ejar.1994.433303
ABDALLAH EL-SHEHABY. "CONTROL OF ONION SMUT BY SEED TREATMENT". Egyptian Journal of Agricultural Research, 73, 2, 1995, 307-314. doi: 10.21608/ejar.1994.433303
EL-SHEHABY, A. (1995). 'CONTROL OF ONION SMUT BY SEED TREATMENT', Egyptian Journal of Agricultural Research, 73(2), pp. 307-314. doi: 10.21608/ejar.1994.433303
EL-SHEHABY, A. CONTROL OF ONION SMUT BY SEED TREATMENT. Egyptian Journal of Agricultural Research, 1995; 73(2): 307-314. doi: 10.21608/ejar.1994.433303
Plant Pathology Research Institute, Agricultural Research Centre
Abstract
Onion seed treatment , at the rate of 2,3.5 and 5g or cc/kg seed with Raxil (terbuconazole); Vitavax 200 (Carboxin+thiuram) and Vitavax 200 FF, highly reduced onion smut incidence in pots, more than did Vin-cit P (flutriafol 2.5%), Vincit F, Prelude (Prochloraz , M.N+carboxin) and Sumi-eight (Diniconazol).. Prelude and Sumi-eight at the rate of 5g/kg seed were phytotox-ic to onion seedlings, as seed germination and seedling heights were sig-nificantly reduced. More reduction in smut disease incidence was obtained when Rax-il and Vitavax 200 were re-tested at the rates 4,6.8,10/kg seeds. Raxil at the rate of 4 g/kg seeds reduced 94.4% of smut infection. While the rate of 10 g/kg seeds showed 100 % reduction in smut incidence, with-out exhibiting any phytotoxicity. Vitavax 200, at the rate of 4 g/kg , showed 67.75 96 reduction in smut incidence, while the higher rates did not show any more significant decrease in smut incidence, in addition to phytotoxicity to onion seedlings. Combined treatments carried out by soaking onion seed in 25 ug/m1Gibberellic acid (GA3) for 3 hours followed by dressing with 2 g Vrtavax 200 per kg seed, reduced 95.8% of smut incidence, while seed soaking in 25 ug/ml (Manganese) for 2 hours and treated thereafter with 2 g Raxil per kg seed, completely controlled onion smut. These combined treatments showed more reduction in smut than that ob-tained with any of these substances or fungicides alone. The amounts of fungicides used in the combined treatments were decreased to 20% of their amounts in the single application required to exhibit almost the same level of disease control.
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