Annona berry fruit failure is a dangerous disease that threatens the fruit of Annona sinensis. It occurs in many areas of Guangdong, Guangxi and other places. The incidence rate of diseased orchards in the severely infected plant reaches 100%, and the yield is reduced by 28% to 35%. First, the damage symptoms Symplocos spinosum mainly damage the immature fruit skin and fruit. At the early stage of disease, there were small yellow spots on the petals of the polymerized berries. The diseased fruit flaps were mostly on the sunny side. The lesions gradually expanded into pseudo-maturity, and the diseased fruit flaps quickly turned purple-brown. In wet conditions, lesions appear as soft rot; dry conditions show dry rot. After the disease becomes hard, the fruit stem is also dry, but it is not easy to break and is not easy to fall off. On the fruit flap of the stiff fruit, there are many small black spots on the surface, breaking through the epidermis. In wet conditions, small dark spots overflow milky white tendrils and peak incidence occurs in May and October of each year. Second, the incidence of pathogens with mycelium, conidia and spores in the tree in the fruit of the winter overwhelming. The pathogen in the dead fruit is the primary infestation source. In the summer of the following year, the temperature is moderate, with slight rainfall. Conidia are transmitted by rain and wind. The occurrence of fruit blight is closely related to soil and climatic conditions. In early summer, if the duration of the rainy weather is long and the relative humidity is large during the early fruit period of Panyu, serious diseases occur. The incidence of dry soils in mountainous areas is lighter, and incidence in flat lands and low-lying soils is heavy. Limestone soil and sandy soil are lighter than clay and red soil. If the temperature is too high, the fruit will cause sunburn, which is conducive to disease. The incidence of fruit on the sunny side of the disease, the incidence of light on the shady face. The occurrence of fruit blight is also related to age and cultivation conditions. According to the survey, adult orchards (over 15 years old) have a severe disease incidence, and the incidence of young orchards (5-6 years old) is light; the excessive planting density causes the diseased orchard in the fields to be heavy, and the moderate planting density does not cause a lighter incidence in shaded orchards. . In addition, excessive application of nitrogen fertilizer can also easily lead to the occurrence of fruit failure. Third, prevention and control measures 2, to strengthen the cultivation and management: After pruning, timely fertilizer, each plant applied 15 kg of organic fertilizer and potassium sulfate 1 kg, and irrigation. In the young fruit period in April, the use of formula fertilization techniques, increasing nitrogen, phosphorus and potassium fertilizers, N, P and K ratio of 1:0.5:1.2, to prevent partial application of nitrogen fertilizer, can reduce the harm of dried fruit disease. During the middle period of fruit development, dry and wet irrigation should be maintained to prevent excessive water accumulation. 3. Chemical control: In the period of 2-3 months when budding and leaf sucking, 0.5 Baume degree lime sulfur is sprayed to kill pathogens on the trees. From April to May, 70% thiophanate-methyl 750-fold or 75% chlorothalonil 500-fold sprayed, sprayed every 10 days, and sprayed 2-3 times, the control effect was over 85%, effective Control the hazards of dried fruit disease. RP International Ltd is top Malic Acid Supplier and Manufacturer in China. Malic Acid Malic Acid,Malic Acid Powder,Malic Acid Food Grade,Food Additive Malic Acid RP International Ltd , http://www.rp-foodadditives.com
1. Pay attention to pruning: After the fruit is harvested, from December to January, pruning the branches and branches of pests, over-close branches and dead branches, and using sticks to lay down all the stale fruits on the tree, remove the fruit on the ground and burn them together. Destroy the pathogenic wintering sites. The plant density is too high. It is necessary to cut thinly to make the forest airy and transparent. These measures can reduce the risk of dried fruit disease.
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