What are the key points for summer grape management?
What should be noted for grapes in summer? Please introduce the following key points to note for grapes in summer: First, prevent pesticide damage: the causes of pesticide damage include improper pesticide mixing methods, excessive concentration, applying pesticide around noon in hot weather, or a sprayer having previously been used for herbicides, etc. The characteristic is that tender shoots and young leaves take on a chicken-claw shape or spread out in a small paper-umbrella shape...
What should be noted for grapes in summer? Please introduce
The following key points should be noted for grapes in summer:
First, prevent pesticide damage: the causes of pesticide damage include improper pesticide mixing methods, excessive concentration, applying pesticide around noon in hot weather, or a sprayer having previously been used for herbicides, etc. The characteristic is that tender shoots and young leaves take on a chicken-claw shape or spread out in a small paper-umbrella shape and cannot open. After pesticide damage, it generally cannot be treated again; only full or partial pruning can be done.
Second, prevent fertilizer damage: the cause of fertilizer damage is that urea, ammonium bicarbonate, etc. are applied in holes too close to the roots or the amount of fertilizer applied is too large. The characteristic is that the middle and upper leaves dry up and die first. The remedy is to dig open the soil covering the fertilizer and water it.
Third, prevent water damage: the main cause of water damage is that high ridges were not made when planting grape seedlings, and long-term rain accumulation causes the plants to be waterlogged for a long time, with lower leaves turning yellow and falling off and the root system rotting and dying. Prevention and control methods: raise the ridges of the planting site or dig ditches for drainage. If the seedlings are small, they can also be dug out and replanted on high ridges.
Fourth, prevent drought damage: the main cause of drought damage is long-term drought without rain and no access to irrigation. The symptom is mainly yellowing and shriveling of plant leaves. The remedy is to water promptly.
Fifth, prevent diseases: in summer, grapes are most prone to downy mildew and felt disease, which can be sprayed with phosethyl-Al, Tuzet, etc. respectively. In addition, methods such as removal and burning outside the diseased area can also be used for prevention and control. After the diseases are brought under control, spray an equal-amount Bordeaux mixture every 10 days, and continue until leaf fall.
Sixth, prevent insect pests: pests such as scarab beetles mostly feed on leaves at night and should be caught manually. In addition, grape tiger moths mainly damage leaves as larvae and can be controlled with pesticides.
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