First, the main reasons for grape rot in late growth
1. Diseases caused by pathogenic bacteria generally cause white rot, anthrax, and black rot in specific years.
2, malnutrition tree weakness, partial nitrogen fertilizer, lack of potassium, calcium, trace elements, or excessive fruiting, load capacity, resulting in weak plant growth, reduced disease resistance.
3, the climate is not wet in summer cut, closed orchards, poor ventilation and light, excessive rainfall, soil and air relative humidity is too large, and accelerate the spread of disease and spread.
Second, the grape after the main control methods
1, strengthen the cultivation and management
(1) Rational fertilization. Fertilizers should be applied in a timely manner to prevent leggy growth, and to deepen the ditch, so that the combination of organic and inorganic fertilizers, nitrogen, phosphorus, and potassium fertilizers, with appropriate potassium fertilizer, to
2. Elimination of overwintering pathogens
(1) Remove damaged twigs and old vines after harvest to enhance the permeability of the garden.
(2) In combination with winter pruning, remove the sub tips, cobs, tendrils, and stamens left on the plants and racks, and thoroughly remove the dead branches and leaves that have fallen on the ground, and then burn them out.
3, pharmaceutical control
(1) The ground sprinkler eliminates the bacteria source. For orchards with severe disease in the previous year, the ground was limed before the occurrence of the disease; the soil with higher pH (7 or above) could be used for spreading the soil.
(2) Spray protection. During the growing season, Bordeaux fluid is sprayed and sprayed once every 10-15 days to protect the leaves, branches, ears, etc. to reduce the chance of infection.
(3) For the disease, the right medicine. In the event of diseases such as white rot and anthrax, they must be prescribed, but care should be taken to alternate the use of the agents. They should not be used as a single agent. Can use 80% mancozeb WP, 50% carbendazim WP and other agents alternately. In addition, in order to prevent pesticides from contaminating the ear after the fruit is colored, the concentration of the drug should not be exceeded.
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