What is the rotten fruit of grapes in summer?

Many farmers responded that their grapes began to rot in the summer. What on earth is going on? Let's make an analysis of this.

1. Bacterial infection

Generally speaking, the main diseases causing grape fruit rot are gray mold, anthracnose, white rot, house blight, acid rot, and black rot in special years.

2. Luxuriant foliage, poor ventilation and light transmittance

Grape shelf surface branches and leaves are too dense, ear retention is large, ventilation and light transmission is poor, prone to diseases and insect pests, resulting in rotten fruit.

3. Malnutrition

The tree is weak, partial application of nitrogen fertilizer, lack of micronutrients such as potassium, calcium and boron, or excessive fruit hanging and large load, resulting in increased root burden, weak plant growth and reduced disease resistance. resulting in water pot disease, sunburn disease, fruit cracking and other fruit rot occurred in a large area. The rational application of fully mature farm manure and organic activation nutrition package fertilizer Jiamei bonus, profit, and potassium platinum can enhance the plant's resistance to a variety of diseases and insect pests and worsen the nutrition of piercing pests, while there is insufficient base fertilizer, too much nitrogen fertilizer, insufficient phosphorus, potassium, calcium and micro-fertilizer, and soil water will promote serious diseases and insect pests and cause large area fruit rot.

4. Problems in spraying

First, the spraying time is not right. Do not spray when there is dew, direct light at noon and strong winds. It is best to spray at 7: 10 in the morning to avoid dew and bright sunlight, and to facilitate the end of the day.

The second is to spray evenly, not too much spray, let alone leakage spray. The grapes should be sprayed on both sides of the hedge, and the scaffolding should be sprayed on both sides of the ear.

Third, it is necessary to spray good medicine, such as mancozeb, methyl thiophanate, DuPont Fuxing, etc., do not spray fake medicine. When spraying, the spray head of the sprayer should choose a fine spiral piece, which is conducive to the fine and uniform spraying.

5. The time and method of bagging are wrong.

Relatively speaking, grape bagging is better early, but not too early, generally in the expansion period. The grapes with late bagging have been infected with germs, and it is difficult to eradicate all the grapes by spraying, and they still breed in the bags. According to the experiment, when bagging during the expansion period, the rotten fruit rate of grapes was only 2.5%, while when it was planted 20 days later, the rotten fruit rate was 17.8%.

Some people think that the bagged grapes are finished within 6 days (days) after spraying. However, according to the author's practical experience for many years, after spraying the grapes and waiting for the liquid to dry, we should pay close attention to bagging, preferably on the same day. If there is no rain and there is no dew at night, it can be done within 2 days. Grape area is large, can be divided into pieces, according to labor, bagging speed, etc., calculate the number of bags in 1 day (days), as much as you can, spray as much medicine. Do not wait for the liquid to dry after spraying, otherwise it is easy to cause rotten fruit. It should also be noted that when bagging, try to avoid touching the fruit with your hands, and tie the upper mouth tightly to prevent Rain Water from leaking.