Grape is a fruit tree with more pests and diseases, especially with the arrival of summer, the temperature rises rapidly, the rain is sufficient, and a large number of pests and diseases are concentrated. At present, the northern openland grapes have ended the flowering period, and the three medicines after the flowering, the young fruit period and the bagging are very important, which is related to the quality and yield of the grapes. How to fight this specific medicine?
Introduction to major pests and diseases
Downy mildew: not only harms the young leaves of the grapes, but also directly on the fruit. Many farmers have suffered a big loss last year for this reason. After the fruit is damaged, the fruit overflows, shrinks, deforms, and the shape of the fruit disappears, causing the grape to lose its commercial character. It occurs after the flowering of Xiehua and before the bagging, especially when there is continuous rainfall.
Black pox: It harms the green and young parts of the grapes, and is most seriously damaged by leaves, veins, cobs and fruits. With the advent of hot and rainy weather, the disease is more likely to occur.
Anthrax: Most of the time when the grapes turn color, and a large part of the reason is that it has been infected in the young fruit period, and the latent disease has not occurred. Therefore, attention should be paid to prevention and control during the young fruit period.
Botrytis cinerea: Mainly harmful to corolla, inflorescence and fruit. Generally, gray mold has two peaks, one is from flower to young fruit, and the other is from fruit coloring to maturity. If the pre-prevention work is not in place, it will easily lead to the late "urine bag."
Hummer: One of the main pests after the grape flower, by sucking the peel to form the hemp fruit, affecting the fruit. When the young fruit was killed, it did not change color. On the next day, the victim was lost in water and contracted to form a small black spot.
Green blind cockroaches: 4 to 5 generations a year, the grapes can be harmed after germination, sucking young leaves, causing the leaves to be vacant. When the young fruit is harmed by the adult or nymph of the green-spotted cockroach, the flower skin will appear. As the young fruit grows, the fruit surface will form small black spots on the wound, which will seriously affect the fruit.
Weevil: A generation occurs in a year, and the damage begins in early May, jeopardizing leaves and inflorescences, causing nicks and voids.
Scarab: A generation occurs in a year, and it begins to endanger in early May. The patina is mainly eaten by the leaves, and the white star chafer mainly eats the fruit.
Time of onset and medication reference
Period: Xie Hua 80%
Control objects: downy mildew, black pox, anthracnose, thrips, weevil, chafer, etc.
Recommended solution: pyrazole enoylmorpholine + iprodione + difenoconazole + imidacloprid + calcium fertilizer
Period: young fruit soy bean size
Control objects: downy mildew, black pox, anthracnose, ulcer disease, thrips, weevil, chafer, etc.
Recommended regimen: prochloraz + imazalil + enoyl sulphonate cyanide + pyrethroid insecticide + calcium fertilizer
Period: young fruit expansion period before bagging
Control objects: downy mildew, black pox, anthracnose, ulcer disease, gray mold, thrips, weevil, chafer, etc.
Recommended solution: pyrazole·desen zinc + boscalylamine, procymidone + cyanoxazole
Precautions
1, after Xie Hua to the bag before the general use of drugs 3 to 4 times, if the rain is relatively large during this period, should be combined with the occurrence of pests and diseases in the garden to increase the number of fights.
2, young fruit grape fungicides are more sensitive to EC insecticide, easy to stimulate the fruit surface, it is recommended not to use this period of EC products. Reducing the use of triazole fungicides, although effective, inhibits grape growth. In addition, avoid using powder before bagging to avoid residual drug spots.
3, 1~2 weeks after flowering is the best time for grape calcium supplementation. It is recommended to carry out 2~3 times of foliar calcium supplementation. At this time, supplementing calcium has a great effect on reducing cracking and daily burning.
4, fight drugs to prevent the main, pre-occurring drugs based on prevention, the main prevention and treatment of drugs after the onset, long-lasting effect, saving time and labor.
5, the combination of drugs and their own garden, do not blindly increase the amount of drugs, waste financial resources, but also easy to produce phytotoxicity.
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