Controlling dahlia powdery mildew disease using antagonistic yeasts
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Abstract
Powdery mildew caused by the fungus Erysiphe cichoracearum is a common disease of dahlia (Dahlia pinnata Cav.) grown in Thailand. This disease affects all parts of the plant and reduces plant quality. Yeasts antagonistic to E. cichoracearum were isolate from Thai fruits and vegetables. Four antagonists (CMY044, CMY019, CMY073 and CMY064) were found that inhibited E. cichoracearum growth with biocontrol efficacies of 100.00%, 88.85%, 88.85% and 86.68%, respectively. Yeast strain CMY044 showed efficacy in reducing the disease incidence of E. cichoracearum on dahlia leaves to as low as 0.00% compared to control plants (sterile distilled water). This result points to the potential applicability of naturally occurring yeast antagonists in an integrated disease management program for powdery mildew on dahlia. The research also included a study of Ovulariopsis/Painted spurge and the evaluation of other environmentally friendly fungicides.
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