How to prevent and cure grape anthracnose? What kind of medicine should I take?

Grape anthracnose is one of the most common diseases during grape ripening. When the disease occurs, needle-sized spots are first produced on the fruit surface, then gradually enlarged, and finally a large area of rot occurs. It is also called late rot in some places. So what's the picture of grape anthracnose? How should grape anthracnose be prevented? What is good for grape anthracnose?

How to treat grape anthracnose? What kind of medicine should I take?

I. existing problems

(1) medication habit. According to field investigation. Now most fruit growers still use mancozeb, thiram, carbendazim, tocopherol and other conventional drugs to prevent and cure anthrax. Triazoles and some new drugs are rarely used. And it is used more often in a year, resulting in drug resistance. The control effect on anthrax is very poor.

(2) period of medication. Fruit grower friends generally do not get sick. No good medicine. And ignore the prevention of pre-anthesis, post-anthesis and post-anthesis to young fruit stage. To provide opportunities for infection and incubation of germs. Causing a pandemic of the disease.

II. Prevention and control of grape anthracnose

1 pathogen and occurrence regularity of grape anthracnose. The pathogen is Colletotrichum anthracnose. The pathogen overwintered mainly by mycelium in the surface tissue of fruiting mother branch, 1-year-old vine, diseased fruit and so on. A large number of conidia were produced in the second young fruit stage. Spread to the young ears with the help of wind and rain. Through lenticels and wounds. The formation of primary infection, with latent characteristics. When the disease occurs in the coloration period, the disease can be re-infected for many times. Causing a pandemic of the disease. There are water-immersed or snowflake-like disease spots on the fruit at the beginning of the disease. After that, it gradually expanded to form dark brown sunken spots. Dense small black particles arranged in a concentric pattern. When the air humidity is high, there is a red sticky substance, and when it is serious, the diseased fruit loses water, and it is easy to fall off. At the same time, it can damage fruit stalks, ear rachis, tender shoots and petioles.

Anthracnose occurred late in the field. It usually begins in early July. Fruit ripening period from August to September. The disease entered an epidemic period. There is a lot of rain in summer and autumn. The high temperature in the near ripening period of the fruit is beneficial to the disease.

(2) Prevention and control of grape anthracnose.

① combined with winter scissors. Clear the garden thoroughly. Remove all the branches, stalks, berries, tendrils, fallen leaves and bundles on the wire out of the garden and burn them or bury them deeply. Reduce the source of overwintering bacteria.

② timely heart picking, reasonable summer shearing, moderate load. Remove the cut shoots and tendrils in time, improve the ventilation and light transmittance of the orchard, pay attention to ploughing and drainage, and reduce the humidity in the garden as much as possible.

③ scientific and reasonable fertilization. Increase the application of organic fertilizer and potassium fertilizer. Pay attention to the ratio of nitrogen, phosphorus and potassium, and avoid too much nitrogen fertilizer. It is also necessary to replenish the trace elements in time. To strengthen the tree strength and improve the resistance.

④ drug prevention and treatment.

Spray 3-5 Baomedo stone sulfur mixture before sprouting in spring.

Before and after the sprouting of grapes, spray 1-0. 7-200-fold Bordeaux solution and 80% mancozeb wettable powder 300-500 times.

During the flowering period and in the early stage of the occurrence of the disease, the following agents can be sprayed: 50% carbendazim wettable powder 600-800 times liquid or 80% mancozeb wettable powder 600-800 times liquid or 70% benzen zinc wettable powder 600-800 times liquid and so on.

The young fruit stage of grape is a critical period for prevention and treatment. The following agents can be used: 200x solution of 2% pyrimidine nucleoside antibiotics or 250,500x of 1% Zhongshengmycin or 1400-2000 times of propiconazole-carbendazim suspension or 1400-1500 times of prochloraz EC or 1500-2000 times of thiabendazole wettable powder or 2000-3000 times of dimethoconazole water dispersible granules. Spray 3-5 times at intervals of 10-15 days.