EFFECTIVENESS OF SYSTEMIC FUNGICIDE SEED DRESSINGS AS PROTECTANTS OF BARLEY SEEDLINGS AGAINST COCHLIOBOLUS SATIVUS

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Abstract
Locally grown Herta barley seed heavily infected with Cochliobolus sativus was treated with eight systemic fungicides. On agar plates C. sativus was isolated from 67% of the untreated seed and the saprophyte Alternaria tenuis from 27%. No C. sativus colonies developed from seeds treated with Vitavax (carboxin), UniRoyal F427, or UniRoyal G696, whereas A. tenuis was recovered from 37, 50, and 63% respectively. In greenhouse tests emergence was increased 10% by G696 but drastically reduced by UniRoyal F849, which also damaged both roots and leaves. Vitavax, F427, and G696 completely controlled seed-borne infection, thereby inducing enhanced seedling height and vigor. Only G696 controlled infection from leaf inoculation. Benlate (benomyl), Cercobin (thiophanate), Tecto (thiabendazole), and F849 did not prevent infection from either source. Control of infection in excised leaves by G696 taken up either from treated seeds or from solution was also demonstrated.

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