Apple Tree Virus Disease Prevention and Control
Second, new research and prevention measures in recent years
1. At the same time as applying the above base fertilizer, comprehensive prevention and control of newly-developed control agents is adopted. In the budding stage of fruit trees, when the buds have not been fully expanded, the first viral DNA (second generation) is sprayed 750 times and a pound of fresh milk is added to the liquid; the second viral DNA is injected within seven days before flowering (second generation 750 times, add a pound of fresh milk; Apple sprayed the virus DNA (second generation) third times before bagging, adding 750 pounds of fresh milk. This method can basically prevent and control apple blossom face disease. Fruit trees that have suffered from Hualian disease can be continuously banished for three years. There is no fruit tree with flower face disease. After use, it can prevent the harm of Hualian disease.
Viral DNA (second generation) is a neutral acid-specific viral inhibitor that can be used in combination with antifreeze, organosilicicine, acidic pesticide fertilizers, acidic or neutral foliar fertilizers, sugars, vitamins, amino acids, vinegar, and the like.
2. Other measures: The germination period of fruit trees is easily affected by the climate, resulting in dramatic changes in temperature, which can cause damage to the trees and create opportunities for viral infection.
1 It is recommended to add antifreeze 500 times and 0.3% brown sugar (first with a small amount of hydration) in the liquid when the temperature is lower than 6°C, and spray the apple trees to prevent flower buds caused by low temperature pollination or freezing damage. Damaged. 2 In the flowering period, when the temperature exceeds 23°C, 500 times more organic silicon silicate and 0.3% vinegar should be mixed to spray the whole tree to prevent heat damage and ensure normal pollen pollination. 3 During the flowering period, when it is continuously accompanied by light rain or foggy days, it is necessary to use 500 times of rotten spirit to accelerate the drug such as Keling to prevent apple tree rot, mold heart disease and malformed fruit. 4 During the growth of apple trees, foliar fertilizer such as organosilicosin and seaweed fertilizer should be sprayed several times, and some trace elements such as silicon and iodine should be properly added. After the summer solstice, it is the critical period for apple trees to bred next year's flower buds. It is necessary to timely supplement the fruit trees with boron, which is the basic material for flower buds. The specific method is to spray apple trees twice between June 22 and August 22. High-purity boric acid or borax (borax is insoluble in cold water below 40°C), sparsely excise new sprouts, allow the trees to ventilate and transmit light, promote fruit trees to form a large number of effective flower buds, and lay a good foundation for the high yield of fruit trees next year. 6 In the case of large quantities of flowers, apple trees must be topdressed for seven days after flowering, and they should be selected for iodine-containing fertilizers that are stable in quality and have good effects, such as foliar fertilizer and seaweed.
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