Evaluation the Resistant Germplasm Resources of Coconut to Gray Leaf Spot Disease
The leaf spot is a common disease of coconuts.To evaluate the sensitivity and resistance grading standards of coconut germplasm resources to gray leaf spot pathogen Pestalotiopsis palmarum,this study used the indoor in vitro leaf injury inoculation method to determine the incidence of 10 coconut germplasm materials,and graded their resistance based on the average diameter of disease spots and systematic clustering analysis.The results revealed that among the 10 coconut germplasm materials,there were 4 immune materials,2 resistant materials,3 susceptible materials,and 1 highly susceptible material.And the results provided the important resources and basis for the development and utilization of the coconut varieties resistant to gray leaf spot disease as well as for the prevention and control of the disease in the future.
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