How to Correctly Control Citrus Sunburn
Sunburn is a physiological disease caused by continuous exposure of the skin to intense sun exposure at high temperatures during the growth or ripening of citrus fruits. It is one of the major causes of abnormal fruit drop in citrus. The peak of onset is from June to September. The skin of the burn site is hard and rough, and the fruit color is yellow or brown-yellow. The fruit is deformed, the capsular flaps are shriveled, the juice is few, the fruit taste is poor, and the quality is poor, resulting in difficult sales or low selling prices.
The following comprehensive prevention and treatment measures should be taken for citrus sunburn:
1, timely spray, spray. Increasing soil moisture and air humidity, improving the orchard's microclimate, and ensuring adequate water supply are the most fundamental measures for preventing citrus sunburn.
2, bagging. To put a special set of citrus on the fruit that grows at the top of the crown and on the periphery of the canopy is the most effective and direct measure to prevent citrus scorch disease.
3, deep garden soil. It can promote the robustness of the citrus tree roots, increase the water absorption range and ability of the roots, and maintain the balance between aboveground and underground growth.
4, paste white paper, coated with lime slurry. Paste a piece of white paper or a layer of lime slurry on the sun-facing surface of fruit that is prone to sunburn or that has a slight sunburn. This can prevent the onset of citrus sunburn or reduce the symptoms of sunburn.
5, cover the soil. It can effectively maintain the relative stability of the water holding capacity of the soil and does not make the tree dry.
6, science spray. Avoid spraying pesticides with high concentrations and avoid spraying pesticides under the hot sun. Use lime sulfur as little as possible during the fruiting period. If lime sulfur must be used to prevent rust wall lice, the concentration should be 0.2 Baume in order to avoid excessive condensation on the fruit surface.
7, spray fertilizer. Spraying 0.05% titanium trace fertilizer can effectively prevent citrus sunburn.
8, thinning fruit. Early eradication of oversized fruits at the top of the canopy and at the periphery of the canopy can reduce the incidence of citrus sunburn.
Fungi, a large class of chlorophyll - free, can not carry out photosynthesis, heterotrophic lower class of plants. These include bacteria, slime molds and fungi. Their common characteristics are: the plant body has no differentiation of roots, stems and leaves, does not contain chlorophyll and other photosynthetic pigments (except a few photosynthetic bacteria), can not carry out photosynthesis, saprophytic life or parasitic life, that is, heterotrophic life. Most of the reproductive organs are single-cell structures, and the zygotes do not develop into embryos.
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