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176 Substrate on Apple Fruit Increased Sooty Blotch Incidence Robert D. Belding*; Rutgers Cooperative Extension, Dept. of Plant Science Rutgers Agricultural Research and Extension Center, 121 Northville Road, Bridgeton, NJ 08302 The potential mechanism of susceptibility of apple (Malus xdomestica Borkh.) fruit to sooty blotch due to carbohydrate leachates was examined. Fruit received applications of 0.5% apple juice to the fruit cuticle in order to mimic leachates. Nine cultivars of apple were selected from a variety block of potentially disease resistant breeding stock. Intact fruit on selected limbs received 0.5% apple juice applications on eight evenly spaced occasions during development. Trees received a minimal fungicide program only. Leachate samples from the fruit cuticles were collected monthly by immersion of whole, detached fruit in dH2O for 60 min. At harvest, fruit were evaluated for skin roughness, fruit rots, sooty blotch, sooty mold, flyspeck, and insect injury. Despite drought conditions, sooty blotch and sooty mold showed strong increases in disease intensity ratings, while flyspeck and skin texture damage showed moderate increases in intensity due to the dilute juice applications. Fruit rots and insect damage were unaffected by the juice applications.

hortscience

178 Response of Valencia Orange Trees to the Foliar Application of Different Potassium Salts: Their Effects on the Vegetative Growth, Leaf Miner Infestation, and Leaf Mineral Contents