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.
Defensive measures:
Smoked tobacco is used as straw, deciduous or wild grasses for fuel, the inner layer is dry fireweed, the middle layer is damp weed grass, and the outer layer is covered with a thin layer of soil. The stack height is 1-1.5 meters and the bottom diameter is 1.5-2 meters. Mu 3-4 heaps, ignited around 2 o'clock in the morning (before the frost occurred), when the temperature dropped to 2 °C. 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.
Flowering pollination and artificial pollination of flowering bees can promote the development of some vegetative tissues in the ovary, thereby enhancing the stress 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.
Strengthen orchard management Early spring canopy whitening can delay budding and flowering to avoid frost. Frozen orchard should be fully used to make full use of late silk flowers to increase fruit output; appropriate late fruit thinning, multiple fruit retention, good bagging, and improved fruit Yield and grade; After the frozen flowers, fruits, branches and leaves are stabilized, pruning is carried out in time to cut the branches and young fruit that can not heal spontaneously after frostbite, and to eliminate the densely crowded branches and legged branches that affect the light, so as to adjust the branch amount. Promote flower bud formation and fruit development.
Disposable accessories,High Quality Disposable accessories,Disposable accessories Details, CN
ShaoXing SurgeCare Medical Products Co., Ltd. , https://www.sxsurgecaremedical.com