What Pesticides to Spray During the Grape Flowering Period? A Detailed Guide to a Scientific Spraying Plan

When growing grapes, pay attention to the prevention and control of pests and diseases, generally focusing on prevention. And the prevention and control during the grape flowering period is very critical. What pesticides should be sprayed during the grape flowering period?

1. Inflorescence emergence stage: During this period, pesticides are generally not used. If green plant bugs (Apolygus lucorum) are severe in some cases, an insecticide needs to be used. If there is a nutrient deficiency problem, a variety of trace elements need to be supplemented.

2. Inflorescence separation stage: During this period, the main focus is the prevention and control of gray mold, downy mildew, black pox, and rachis blight, while also paying attention to boron supplementation. Mancozeb, carbendazim, and similar products can be used. When gray mold is severe in greenhouses, pyrimethanil can be added. For problems such as flower and fruit drop that are easily caused by boron deficiency, fluid boron can be used. During this period, attention should also be paid to the prevention and control of the spotted lanternfly. If spotted lanternflies appear, pay attention to the use of insecticides.

3. Early flowering stage: The purpose of pre-flowering prevention is to ensure safety during the flowering period. Regardless of the variety, pesticides need to be used for prevention and control. The grape flowering period is a relatively fragile period, so prevention must be done well, and at the same time zinc and boron need to be supplemented to prepare for grape fruit set. From after flower drop to before bagging, reasonably adjust the pesticide application according to the bagging time. Pesticide application before bagging is also a key point of prevention and control. Adjust the pesticide application according to the specific situation (bag 3 days after application), and pay attention to the use of foliar fertilizer. During this period, calcium supplementation is generally more important. Sugar alcohol calcium can be used to supplement the calcium deficiency problem during grape enlargement.

Grapes should be well protected before the flowering period. It is best not to use pesticides during the flowering period, so as to avoid flower and fruit drop. If there are special circumstances, appropriately spray some low-concentration pesticides.