Black spots on the fruits of summer jujube trees have caused headaches for many growers. How can this situation be avoided in jujube production? According to Gao Meixiu, a teacher from the Department of Horticulture at the Tianjin Agricultural College, Jujube is a fruit-cut disease or anthracnose. Jujube fruit disease is a kind of bacterial disease. After invading the normal fruit, the jujube fruit will have halo, water stain, atrophy and shedding. The fruit lesions appear red in advance, and there is no luster. After dissecting the jujube, we can see brown spots from the outside to the inside in the lesion areas of the flesh. The brown flesh has a bitter taste and the outer skin of the lesions shrinks. The fruit handle is brown or dark brown. Observations have shown that sucking insects, like peach borer insects, scale insects, stink bugs, ticks, and leafhoppers can all spread diseases. If the infected period encounters continuous rain or rain, or encounters intermittent sunny and rainy, alternating high temperature and high humidity weather, the disease is often prone to disaster. When jujube is half-red, it is easy to fall to the ground when it is ripe, causing losses. For the prevention and treatment of jujube fruit shrinkage, in the management of jujube orchard, it is necessary to pay attention to the prevention and control of pests in the mouth sucker and to reduce the density of diseased insects as much as possible. In the period from the middle of August to the beginning of September, agricultural streptomycin, kanamycin, oxytetracycline, or 50% DT 500 times solution was used for prevention and control. The dosage was slightly higher than that in the instructions. Spray once in 8 days and spray two or three times in total. At the same time, add 40% omethoate or 20% water-containing phosphorothioate 1000 times in the liquid to kill pathogenic insects. The good fruit rate can reach more than 95%. Jujube anthracnose prevention and control. The jujube anthracnose is also a bacterial disease. The infected jujubes resemble the brown spots that appear after the stink bug has penetrated, and then the brown spots expand continuously, showing black spots, and the spots have light yellow halo rings. Finally, the lesions develop into round and oval shapes. Dark brown with depressions. Anthracnose suffers from a decrease in the amount of growth and the sugar content of the pulp is low, and most do not fall off. However, in anthracnose on dates that are stained with the fruit of the fruit, the lesions are large round or irregular black-brown lesions. On one side of the jujube, there is contraction and the flesh is bitter. The spread of this disease is also related to insects sucking mouthparts. The control method of jujube anthracnose is firstly to reduce the density of the diseased insects. In the onset of August, spray 75% of chlorothalonil 800 times twice or three times every 10 days.
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