Grape flower disease control technology
The flowering diseases of grapes such as summer black and red earth mainly include gray mold and brown shaft blight, both of which belong to fungal diseases. Botrytis cinerea, also known as ear rot, has been more serious in the south in recent years. The diseased orchard can destroy more than 70% of spikes. It mainly damages corolla, pedicel, flower spikes, and pollen after flowering. Young fruit, resulting in direct loss of fruit spikes. Spindle brown leaf blight, also known as axis blight, is known as burnout by fruit growers and is primarily harmful to pedicels, rachis, branching axes, and young fruit. It is one of the major diseases in the grapevine flowering period and often occurs simultaneously with gray mold. Since both diseases belong to a cool and moist type, continuous rain and high humidity can easily induce the prevalence of these two diseases.
Prevention:
1, to do before and after the flowering management of dendrite: dense dendrite, the auxiliary tip is not processed in time, the curtain closed, the inflorescence does not see light is the main factor to induce the disease, therefore, to be fixed in time before 15 days before flowering, wipe Too much dense tip; see flowering or 1-2 days before flowering, picking, leaving the front and back of the apricot in addition to a total of three nodes left 2-3 leaves topping (anti-sunburn), the rest are erased, so that the leaves are not depressed Closed, inflorescence see light.
2. Reduce humidity in the greenhouse before and after flowering: In case of low temperature and rainy weather before and after the flowering period, when the minimum temperature is above 14°C, the greenhouse is cultivated, the greenhouse is opened all day, and the rain is not cultivated. High shed membranes to improve the ventilation conditions in the park and reduce the humidity in the greenhouse.
3, chemical control: application of two drugs, that is, see flowering or 1-2 days before flowering and the seventh day after flowering. Special attention should be paid to the fact that the end of flowering period to the fruit setting period is the peak of disease infestation. Therefore, on the seventh day after flowering, it must be controlled by drugs. If it has been onset before flowering or the flowering period is continuous cloudy, it should be increased by 1-2 times during the flowering period, but at the flowering stage. Spraying should avoid the morning flowering time and can be sprayed after 2 pm. Pharmacological choice: If there is no disease, you can use a protective agent such as acetaminophen. If you have an episode, you should use Shijiale (ie, pyrimethanil), Veloxacillin, Nongliring or Ai Miao and other therapeutic agents. Various pesticides should be used interchangeably to avoid drug resistance.
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