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DAMAGE CHARACTERISTIC DISEASE MANAGEMENT PRACTICES During severe infection, become unfit for field planting Generally, the fungi are weak parasites that thrive on poorly nourished palms which are physiologically weak to resist fungal infection. Practice proper cultural management to prevent leaf spot. seedlings APPEARANCE Prevention Infect both young and old palms; affects the leaves thereby reducing the photosynthetic activity of palms Space seedling at 60 x 60 cm triangular distance to provide adequate room for developing palms. Prune and collect damaged leaves and burn severely infected seedlings in nursery. Spots enlarge and fuse making the leaf appear blighted or burnt Leaf spot caused by Pestalozzia palmarum Cke. & Grev. Appear first as small yellowish brown, circular to oblong spots on leaflet. Spots gradually turn brown with ashen gray center surrounded by dark brown bands. Spots enlarge and fuse making the leaf appear blighted or burnt. Prune damaged leaves and burn Conidia of P. palmarum Small yellowish brown, circular to oblong spots on leaves initial symptom of disease Leaf spot caused by Helminthosporium sp. are small, dark brown sunken necrotic . Spots gradually enlarge to form blight Do not overgrow seedlings in nursery, overcrowding predisposes young palms to infection. Fertilized the seedlings to improve their vegetative growth, vigor & resistance to the disease. Control Apply recommended fertilizer both for coconut seedlings and field planted palms. Spray fungicides such as Vitigran Blue, Captan 500, Daconil 2787 at 3tbsp per gallon of water every 15 days for leaf spot still occurring despite fertilizer application CPD Technoguide No. 6 Series 2001 LEAF SPOT DISEASE OF COCONUT Nemesia C. San Juan-Bachiller Spraying of Fungicides Severely infected palm with leaf spot (without fertilizer) FOR ADDITIONAL INFORMATION: Call, write, or visit: Palms with healthy growth and no leaf spot (with fertilizer) The Crop Protection Division Davao Research Center Philippine Coconut Authority Bago-Oshiro, Davao City Tel. No. (082) 293-0116 Fax No. (082) 293-0571 E-mail : [email protected] [email protected]