Late spring frosts are often called "late frosts." Late frost mostly occurs in the fruiting period from budding to young fruiting. Generally, fruit trees such as peaches, apricots, plums, apples, and pears, which are generally early budding and blooming, are more susceptible to late frost.
Symptoms: After germination, the sprouts appear brown or black after frost and the scales are loose and do not germinate. Flower buds and flowering seasons are frosty. Because the pistil is not cold tolerant, the light frost can be used to freeze the pistil receptacle and the flowers are opened as usual. When the weight is too heavy, the stamens can be frozen, and when the petals are severe, they are discolored and fall off. The young fruit is frozen, deformed, grows slowly, and finally falls off. The young leaves suffer damage, the leaf margins change color, the leaves become soft and even dry.
Defense measures: (1) Smoke. Use crop stalks, deciduous or wild grasses as fuel, the inner layer is dry fireweed, the middle layer is damp weeds, and cover with a thin layer of thin soil, the stack height is 1 to 1.5 meters, and the bottom diameter is 1.5 to 2 meters, 3 to 3 meters per mu. 4 Heaps, ignited at about 2 a.m. (before frost) and when the temperature dropped to 2°C. (2) Irrigation under the trees, spraying water on the trees. The large heat capacity of water has a regulating effect on the change of temperature, and timely irrigation before the next frost can effectively prevent or reduce the risk of frost. In addition, spraying the water on the trees under the frost also helps ease the frost. (3) During the flowering period, the bees were pollinated and pollinated artificially. Pollination can promote the development of some vegetative tissues in the ovary, thereby enhancing the resistance of flower organs. According to the test, the bee area can reduce the frozen rate by more than 40% compared with the bee-free area; artificial pollination has the same effect. (4) Strengthen orchard management. White canopy in early spring can delay germination and flowering to avoid frost; in the orchard with serious frost damage, it is necessary to make full use of late silk flowers to increase fruit output; appropriate late fruit thinning, more fruit retention, better bagging, and increase fruit yield and grade After the flowers, fruits, branches and leaves have been stabilized, pruning is carried out in time to cut the branches and young fruits that can not heal spontaneously due to frostbite, and to eliminate the densely crowded and leggy branches that affect the light, so as to adjust the branches and promote flower buds. Formation and fruit development.
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