Prevention and Control of three physiological Diseases of navel Orange
First of all, the varieties (lines) with strong cracking resistance should be selected for fruit cracking disease, generally, the varieties (lines) with oval fruit shape, small navel or closed navel have better cracking resistance, such as Newhall, etc.; secondly, it is necessary to strengthen scientific management and enhance the tree potential. Especially in the dry period from the plum rain to the autumn rain, we should do a good job in water management, so as to irrigate or spray water in time, keep the soil moist and promote the normal growth and development of fruits. Thirdly, foliar potash fertilizer was sprayed continuously for 2 times during the period of rapid expansion of fruit.
Sunburn orchard covering straw is the basis of preventing sunburn; planting forage grass or interplanting green manure in orchard can reduce sunburn; in high temperature season, do not spray pesticides such as oil emulsion and stone sulfur mixture, so as not to aggravate the occurrence of sunburn. In the early stage of sunburn, stick white paper on the sunburn fruit surface, and pull branches and leaves to block the fruit to reduce direct sunlight exposure.
Umbilical yellow disease begins with the cultivation of healthy trees, appropriate application of nitrogen fertilizer to improve tree nutrition level and nitrogen metabolism function; secondly, pull Qiangwang autumn shoots into a drooping or horizontal state before flowering, so that the vast majority of flowers bloom downward, reduce Xiangyang fruit and prevent the occurrence of navel yellow; spray the navel of fruit with 600 times "xanthate" solution from late July to late August to inhibit the occurrence and spread of navel yellow.
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High yield Management of early Fruit of navel Orange planted for three years
Navel orange seedlings must be carefully prepared to dig large holes or grooves and fertilize the foot before planting. The survival of the colonized seedlings is mainly through the following measures to promote high yield in the third year. Scientific fertilization. The navel orange seedlings planted in that year usually survive in half a month.
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Field Management of navel Orange Orchard in Spring and Summer
Gannan is early in spring, warm and rainy. March to June is the spring shoot growth of navel orange, flowering and setting fruit, the first and second physiological phenological periods of fruit drop. It is also more than 10 kinds of diseases and insect pests, such as citrus bud maggots, mites, scale, leaf roll moth, longicorn beetles, anthrax, resin disease, canker and so on.
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