Jujube fruit disease is one of the major diseases in the major jujube areas. Jujube fruit disease is mainly transmitted by wounds caused by sucking mouthparts, such as ticks, leafhoppers, and stink bugs. Generally in the late of August, the jujube fruit turns white to coloring. When the temperature is 26-28 degrees, once the rainy weather or rainy weather is encountered, the disease can easily become an outbreak. Starch disease is characterized by more occurrences of spots and slices. A jujube garden often has several trees with severe onset, and one jujube tree often has several diseases such as severe onset of branches.
First, the symptoms:
The fruit that was immersed first appeared irregular yellow-brown spots on the shoulder or rim of the fruit, and the skin appeared watery yellow, the margins were unclear, and later the peel became dark red, shrinking and dull, and the flesh wards. Brown spots appear from outside to inside, bitter, unbearable. The handle becomes brown or dark brown. The entire disease shrinks and falls off before maturity.
Second, prevention and control technology:
1, scientific management. Increase the application of organic fertilizer and phosphorus and potassium fertilizers, less nitrogen fertilizer, a reasonable intercropping, avoid intercropping high stalk crops, improve air and light conditions of the Zaoyuan Park, appropriate fruit set, in order to enhance tree vigor, improve jujube tree's own resistance to disease.
2, clean the orchard, eradicate the source of bacteria. In the fall and winter seasons, the jujube or fruit infestation is thoroughly cleaned and concentrated to reduce the source of bacteria. Before the jujube sprouts, the whole park sprayed 3 to 5 Baume degrees of lime sulfur.
3, a reasonable spray. According to the temperature and rainfall conditions, from the end of July to early August, spray the first drug, and then spray 2 to 3 times at intervals of about 10 days, 10 to 15 days before the date of harvest is a critical period for prevention and treatment. At present, the more effective agents are: bacterial streptokins can be used for agricultural streptomycin 70 to 140 units / ml, oxytetracycline 140 to 210 units / ml, kanamycin 140 units / ml; for fungal fruit shrinkage, 75% chlorothalonil WP can be used 600 times. According to the test, spraying 50% Jujube Guoning No. 1 WP 600 times before the onset of the peak has obvious control effect. When spraying, it should be even and thoughtful, and the fog should be fine, so that the fruit surface will be covered with medicine, and the rain will be sprayed in time.
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