Grape flowering disease affects yield how to control grape flowering disease

The flowering stage of grapes such as Xiahei and Red Earth is threatened by Botrytis cinerea and ear axis brown blight, both of which are fungal diseases. The southern grape caused by Botrytis cinerea is more serious, and the seriously affected vineyards can destroy more than 70% of the flower ears, mainly harming the Corolla, small pedicels, pedicels and young fruits. Brown blight of ear axis, which is called rotten flower by fruit growers, mainly harms pedicel, rachis, branch axis and young fruit, and occurs simultaneously with Botrytis cinerea. Continuous rain and high humidity are easy to induce these two diseases. Prevention and control measures:

Grape flowering stage

The main results are as follows: 1. Do a good job in the management of branches and vines before and after flowering: the branches are too dense, the secondary shoots are not treated in time, the canopy is closed, and the inflorescences are not bright and stale are the main factors causing the disease. therefore, it is necessary to set the shoots in time about 15 days before the grape blossoms, and erase the shoots that are too dense. See flowering or 1-2 days before flowering, the accessory shoot leaves 2-3 leaves before and after the inflorescence to remove the heart (sunburn), and the rest are erased, so that the vine leaves are not closed and the inflorescence is visible.

2. Reduce the humidity in the grape greenhouse: before and after flowering, when there is low temperature and overcast rain, the lowest temperature is above 14 ℃, cultivated in the greenhouse, the door of the greenhouse is opened all day, and the cultivation is protected from rain. Under the premise of ensuring that the leaves are not drenched by the rain, lift the greenhouse film, improve the ventilation in the garden, and reduce the humidity in the greenhouse.

3. Chemical control: apply the medicine twice, that is, the flowering period of grapes or 1-2 days before flowering and the seventh day after flowering. It should be paid special attention that the period from the last flowering stage to the fruiting stage is the peak of disease infection, so the grape must be treated with medicine on the seventh day after flowering. If the disease has occurred before flowering or continuous overcast and rain during the flowering period, it should be used 1 or 2 times during the flowering period. But spraying should avoid flowering time in the morning and choose after 2 o'clock in the afternoon. Medicament choice: when the grape is not sick, you can choose protective agents such as prohydantoin, if it has occurred, you should choose Shijiale (that is, pyrimidine), Sukeling, Nongliling or Aimiao and other therapeutic agents. All kinds of pesticides should be used alternately to avoid drug resistance in grapes.