Coming into August, with the increase of rainfall, the humidity will increase and the temperature will remain high, which will facilitate the occurrence and spread of various diseases of jujube trees. This period needs to focus on prevention and control of anthrax and brown spot.
Anthracnose combined with pruning promptly cut pests and branches and dead branches to reduce the source of infection. Strengthening the management of the jujube garden and increasing the use of farmhouse fertilizers can increase tree vigor and improve the disease resistance of plants. In the young fruit of jujube, foliar fertilizer should be sprayed. The key to the prevention and control of pesticides in the growing season is spraying pesticides in a timely manner to prevent the infection of pathogens and reduce the fruit carrier rate. It has been proved that the first drug is sprayed about half a month after fruit setting, and then the interval between medications is set according to the length of the drug's effective period and rainfall, and generally 4 to 6 shots are used to effectively control the damage of anthrax. The commonly used effective agents are 200 times Bordeaux mixture, 37% difenoconazole water dispersible granules 2000 times, 325 grams per liter benzyl azoxystrobin 2000 times, 80% fulfos zinc WP 600-800 times 50% pyrimethanil carbendazim 1000 times.
Brown spot disease, also known as black rot, is an important disease in the domestic jujube area. In the past decade or so, the disease has become increasingly serious. The rate of illness in popular years is as high as 50%, and severe cases can reach 70% or even lose.
The incidence of this disease is related to the variety of crops. When jujube is planted between high-stalk crops such as corn, the ventilation and transparence are poor, and the humidity is high, which is beneficial to the onset and the disease is heavy. The jujube garden of interplanting beans and cotton is due to stagnation. There are many pests, such as carnivora, which damage the fruit and cause many wounds. Intercropping of peanuts and sweet potatoes and other low stalks of the jujube garden, good air and light transmission, low humidity, light incidence. To prevent and treat this disease, comprehensive management measures must be taken.
1 Do a good job in clearing the garden: Clear the ground dead fruit and deeply buried, to severely diseased jujube gardens or plants, combined with pruning carefully cut away dead branches, pests and branches concentrated burned to reduce the pathogen.
2 Strengthen comprehensive management: increase organic fertilizers and potash and potassium fertilizers, increase tree vigor, and use foliar fertilizer scientifically to improve disease resistance. Zaoyuan interplant rows of peanuts, sweet potatoes and other low stalk crops, not between the high stalk crops such as corn, to maintain the Zaoyuan ventilation and light, reduce the air humidity in the Zaoyuan, reduce the incidence.
3 Spraying protection: Spraying once every 10 to 15 days in young fruit period, 800 to 1000 times more than fox zinc, or 1000 times more manganese zinc, 800 to 1000 times aluminum aluminum manganese zinc wettable powder liquid + agricultural streptomycin tablets 3000 liquid, continuous spraying 3 to 4 times; young fruit is sprayed once every 20 days after spraying 200 times Bordeaux mixture, and alternately with the above liquid.
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