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 become more severe in recent years. The diseased orchard can destroy flower spikes by more than 70%. It mainly damages the corolla, pedicel, flower spikes, and pods immediately after 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.
To manage the branches and vines before and after the flowering period: Overtly dense branches, underhanded shoots, closed canopy, and inflorescences are not the main cause of disease. Therefore, it is necessary to set the shoot in time before 15 days before flowering. The dense tip; See flowering or 1-2 days before flowering, picking, before and after the apricot in addition to a total of three nodes inflorescence left 2-3 leaves topping, the rest are erased, so that the vine leaves do not close, inflorescence see light.
Before and after the flowering period, the humidity in the greenhouse was reduced: in the low and rainy weather before and after the flowering period, and when the minimum temperature was above 14°C, the greenhouse was cultivated, and the greenhouse was opened all day to avoid rain, and the shelter was not exposed to rain. Membrane, in order to improve the ventilation conditions in the park, reduce the humidity in the greenhouse.
Pharmacological control: application of 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.
Pharmacy selection: When the disease is not selected, use mothionine and other protective agents, the disease should be used Shijiale, fast-king or Ai Miao and other therapeutic agents. Various pesticides are used interchangeably to avoid drug resistance.
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