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Chemical control of seed-borne fungal pathogens of sunflower / control químico de patógenos de semillas en girasol / mesures de défense contre les champignons pathogènes du tournesol transmis par la semence

Rauf Bhutta, A, Rahber Bhatti, M.M., Ahmad, Iftikhar, Sultana, Ishrat
Helia 2013 v.24 no.35 pp. 67-72
Helianthus annuus, chemical control, cultivars, fungicides, pathogens, seed germination, seed-borne fungi, sunflower seed
Five fungicides, namely Tecto, Benlate, Bayton, Topsin and Derosal, were evaluated for their effect on seed germination and control of major seed-borne pathogens of sunflower. Two sunflower cultivars, HO-1 and NK-212, naturally infected with important seed-borne fungi were treated with these fungicides at 1.5, 2.0, 2.5, 3.0 g/kg. All the fungicides under study controlled the seed-borne fungi and increased the germination of sunflower seed to various levels. Tecto and Benlate in both cultivars gave better performance in reducing the fungal population and increasing seed germination. Topsin and Derosal also reduced the fungal population at higher dosage but there was no considerable improvement in germination. The use of fungicides at 2.5 g/kg provided almost complete elimination of fungi and 8-10 percent increase in seed germination as compared to the use of fungicides at 2 g/kg.