Biological control of Thielaviopsis Bud Rot of Hyophorbe lagenicaulis in the field
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Abstract
Thielaviopsis Bud Rot was first reported to infect the Bottle Palm (Hyophorbe lagenicaulis) in Thailand and causes a range of symptoms e.g. Stem Bleeding, Bitten Leaf, Dry Basal Rot and Heart Rot. The isolated pathogen is confirmed to be pathogenic to the Bottle Palm. We carried out bi-culture antagonistic assays using the antagonistic fungi, Chaetomium cupreum and C. globosum against T. paradoxa. Assays showed these fungi to be antagonistic against the pathogen in vitro. In the field the five year old Bottle Palms completely recovered from disease when Chaetomium biological product was applied to infested soil at the rate of 20 g/plant. Antagonistic substances produced by C. cupreum and C. globosum were sprayed to control terminal bud rot and integrated with other cultural control measures. The treated trees recovered significantly within 30 days of application and new leaves emerged. The Chaetomium biological product has good potential in the control of Bud Rot of Bottle Palm.
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