Apple fruit disease mainly shows symptoms on the fruit, and some also show symptoms on the leaves and shoots. The incidence of fruit, due to different varieties and time of onset sooner or later, is divided into several kinds of fruit wood-embedded, dried fruit spots and rust spots. In particular, the incidence of corky wood is the most prevalent type, occurring half a month after flowering to fruit maturation. Small spots of water stains begin to appear on the flesh. The expanded meat is brownish, spongy and uneven. There is a soft feeling of pressure, small deformity, easy to fall early. Fruit surface dry spots are mostly infected after flowering and young fruit development. The fruit surface is dark green or dark red and the water spots are spotted. The flesh is brown, and the diseased part shrinks, hardens, sinks, and deformities, resulting in necrosis. Some crack at the dry spot, fall early. The rust type is mostly manifested in Marshal and other varieties of disease, the fruit surface brown cracks horizontal stripes, flesh soft. The shoots and leaves were mostly infected in early summer when the top leaves of the shoots were pale yellow and the petioles and veins were red and distorted. The tip and leaf margins were dead, or slender twigs were formed under the dead shoots and many small, thick, crisp clusters were found. blade.
The disease is mainly caused by the lack of boron needed for the growth and development of apple trees in the soil. In the flowering period, the amount of boron is especially required. Boron supplementation is crucial to the cure of fruit disease.
Control methods: 1. Strengthen the cultivation and management, and increase the application of fully decomposed organic fertilizer or organic-inorganic biological compound fertilizer containing humic acid. According to the growth ratio of apple tree growth to nitrogen, phosphorus, potassium 2:1:2 ratio, fertilize, supplement spray of nitrogen, phosphorus, potassium and many trace elements of Eurasian or gold potassium water soluble fertilizer to enhance tree disease resistance. ability.
2. Apply boron fertilizer at the end. Fall or spring is planted according to different ages of large, medium, and small trees, or trunk diameters that are 33 centimeters high above the ground, and trunk diameters are 8 to 17 centimeters, 23 to 26 centimeters, and 33 centimeters or more. 95% borax 50-150 grams, 200-350 grams, 350-500 grams, evenly applied to the crown projection range, followed by watering.
3. Leaf spray boron. Before and after flowering and young fruit expansion period, spray 200 to 250 times borax solution or 750 times of calorific boron, 300 times of zinc-calcium-boron whole plant spray 2 to 3 times.
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