Biological and chemical control of sunflower basal stem rot caused by Sclerotium rolfsii

Document Type : Original Article

Author

Plant Pathol.Depart., Fac.Agri., Minia Uni., Egypt

Abstract

The studies showed significant inhibitory effects of potassium bicarbonate (KHCO3) either on growth parameters of Sclerotium rolfsii or in sunflower root/collar.  Inhibitory effects were increased by enhancing KHCO3 concentration. KHCO3 gave significant inhibitory effects against Sclerotium rolfsii caused76.6, 57.69 and 95.78% inhibition for linear growth, sclerotial formation and mycelial dry weight, respectively at 0.6g/l KHCO3.KHCO3provided synergistic effects with Trichoderma harzianum, Since the antagonistic potentiality of T.harzianum against S. rolfsii was increased with increasing KHCO3 concentrations. KHCO3  caused 80 and 76% inhibition for linear growth and sclerotial formation, respectively. However, the most effective to prevent growth parameters and infectivity of  S.rolfsii  the combinations of potassium bicarbonate and hydrogen peroxide (H2O2) with Trihoderma harzianum 86.25% and 97.6% inhibition for radial growth and sclerotial formation at H2O2 (1.2 g/l) +KHCO3 (0.6 g/l) with T.harzianum , respectively. The treatments H2O2 (1.2 g/l) +KHCO3 (0.3g/l) with T.harzianum and H2O2 (1.2 g/l) +KHCO3 (0.6 g/l)  with T.harzianum  achieved  75% and 71% protection against sunflower basal stem rot, respectively.

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Scientific Journal of Agricultural Sciences
Volume 3, Issue 2
December 2021
Pages 195-203

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