During the late spring and early summer, most citrus trees will naturally drop tiny, marble-sized fruit. Guava is an important fruit crop in Egypt. acetamiprid Important spray for codling moth control during first cover. To prevent peach leaf curl, trees must be sprayed with a fungicide after their leaves have dropped and they are dormant. This is usually in late November, or December. Spraying at specific times throughout the growing season is necessary because many pests attack different fruits multiple times. To prevent fruit drop, do not use carbaryl (Sevin®) within 30 days after full bloom. When you use 2,4-D to reduce preharvest drop of mature fruit, apply the compound before (preferably shortly before) fruit drop becomes a problem, but far enough ahead of flowering to minimize undesirable effects that 2,4-D would otherwise have on the spring cycle of growth. Protection of the foliage and bark is also necessary to maintain healthy and productive plants. You should check to see if … The chemical ethephon, used to stop fruiting, breaks down into a natural plant hormone, ethylene. Application: Follow the label. Controls pests on contact. Spraying plants under stress can cause additional damage to a plant. Pests must be present for spray to be effective. Guava trees usually give the heaviest yield in summer which is sold at little price. If it is a particularly wet winter, a second application of fungicide can be made in early spring, just as buds begin to swell. Plants under stress from drought, high temperatures, insect and disease problems, or environmental stress, such as compacted soils, poor drainage, or improper pH will produce ethylene. Winter spraying, while trees and shrubs are not actively growing, can prevent or reduce many significant diseases. A repeat application for stop-drop prevention can be made 7 days after the first if needed. For mature grapefruit and Valencia orange trees, 2,4-D can be applied to reduce preharvest drop of mature fruit or as a dual-purpose spray … ... or is expected to drop below freezing before spray dries. apple scab, sooty blotch, fly speck thiophanate –methyl plus captan or myclobutanil2 Will provide the best management for sooty blotch/fly speck. More commonly the cause of plum fruit drop is poor pollination. ... and products for fruit tree spraying. Disease Control Sprays Bonide® Captan Fruit & Ornamental (wettable powder) When several apples drop in response to limb bumping, it is time to harvest within 2 days or apply NAA. Freezing weather on wet spray can damage buds. To avoid fruit drop, apply 30 days after full bloom. Applications are most effective and should be made when temperatures are above 70 degrees F and NAA is only effective for 7-10 days after spraying. Can be applied up to 3 days before harvest. 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