Common Name/Causal Description Control and Organism Symptoms Management: 1. Phytophthora Diseases Serious disease of durian Soil borne fungus can infect all parts of the tree in all stages of growth and development by wind, rain water, insects and snails Cause serious damage among orchards. Commonly a. canker (Fig. 25a) observed in Appearance of wet Provide wide spacing, durian trees at lesions on the bark remove weeds & bearing stage surface, usually near prune low hanging depending on the crotch region branches. the variety chemical at the planted. Bark necrosis is first sign of infection. accompanied by Scrape and remove discoloration and diseased barks. Paint exudation of reddish infected wood with brown, gummy, fungicide. resinous substance Apply Trichoderma hazianum Infection initiated on b. Seedling Dieback and Foliar the leaves induces Sanitation, aeration Blight (Fig. 25b) symptoms and drainage are key characterized by factors in nursery off-colored, operation. water-soaked spots When needed, which become dark and coalesce into periodically spray large necrotic or systemic fungicides dead patches such as Metalaxyl or Fosetyl Aluminum or combining first sign of infection appears as tiny water-soaked c. Phytophthora fruit rot lesions which later Phytophthora fruit rot coalesce and become is best controlled by brown then dark on integrated the fruit surface, phytosanitary which later result measures, cultural into peel cracks on practices and chemical
Common Name/Causal Organism Description Symptoms Control and Management: 1. Phytophthora Diseases a. canker (Fig. 25a) b. Seedling Dieback and Foliar Blight (Fig. 25b) c. Phytophthora fruit rot Serious disease of durian Soil borne fungus can infect all parts of the tree in all stages of growth and development by wind, rain water, insects and snails Cause serious damage among orchards. Commonly observed in durian trees at bearing stage depending on the variety planted. Appearance of wet lesions on the bark surface, usually near the crotch region Bark necrosis is accompanied by discoloration and exudation of reddish brown, gummy, resinous substance Infection initiated on the leaves induces symptoms characterized by off-colored, water-soaked spots which become dark and coalesce into large necrotic or dead patches first sign of infection appears as tiny water-soaked lesions which later coalesce and become brown then dark on the fruit surface, which later result into peel cracks on Provide wide spacing, remove weeds & prune low hanging branches. chemical at the first sign of infection. Scrape and remove diseased barks. Paint infected wood with fungicide. Apply Trichoderma hazianum Sanitation, aeration and drainage are key factors in nursery operation. When needed, periodically spray systemic fungicides such as Metalaxyl or Fosetyl Aluminum or combining Phytophthora fruit rot is best controlled by integrated phytosanitary measures, cultural practices and chemical
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