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 recent years. The diseased orchard can destroy flower spikes by more than 70%. It mainly affects the corolla, pedicel, flower spikes, and newly-embroiled seedlings before flowering and flowering. 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:
First, do a good job before and after the flowering management of dense dendrite branches, the auxiliary tip is not dealt with promptly, the curtain closed, the inflorescence does not see the light is the main factor to induce the disease, therefore, to be fixed in time before the flower is about 15 days, wiped off More dense tips; see flowering or 1-2 days before flowering topping, sub-tips in addition to inflorescence before and after a total of three nodes left 2-3 leaves topping (anti-sunburn), the rest are erased, so that the leaves do not close Inflorescences see light.
2. Before and after the flowering period, reduce the humidity in the greenhouse. Before and after the flowering period, encounter low temperature and rainy weather. When the minimum temperature is above 14°C, the greenhouse is cultivated, the greenhouse is opened all day, and the rain is not cultivated. Shed film to improve the ventilation conditions in the park and reduce the humidity in the greenhouse.
Third, the drug control application of good two drugs, namely 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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