Grape planting technique: why is the summer black grape rotten?

The rotten fruit of summer black grape may be caused by the following factors for reference:

It was low temperature in early spring and the sprouting period of grape was later than usual. After entering April, the low temperature, overcast rain and low sunshine for nearly half a month led to the slow growth of grape after sprouting, the growth of new shoots was very slow, and the tree potential in the whole growing period was obviously weaker than in previous years.

Since July 10, there has been continuous heavy rain or torrential rain for nearly a week, followed by a high temperature of more than 35 ℃. At this time, it is the period of grape coloring, resulting in high temperature growth obstacles.

After July 18, the disease occurred in each orchard one after another, the orchard with poor drainage condition or high load was more serious, the orchard with reasonable load and the orchard cultivated in shelter from rain suffered less or rarely.

Prevention and control of rotten fruit of summer black grape:

At present, the orchard should be carefully inspected, the seriously diseased ears should be cut off and taken out of the field for treatment. the lightly affected ears should be cut off first, and then soaked in 20% difenoconazole microemulsion (2000 times liquid) and 22.2% clotrimazole EC (1200 times liquid).

Spray the mixture of 40% flusilazole EC (8000 times liquid) and 20% difenoconazole microemulsion (3000 times liquid).

Clear the ditch to ensure that the orchard does not accumulate water after rain; reasonable load, in principle, no more than a bunch of fruit ears; strong tree potential, combined with spraying foliar fertilizer.