The main reasons for grape jumping red include excessive fertilization in the soil, lack of trace elements, improper use of hormones, and pests and diseases. These problems lead to poor coloring of grape fruits and the occurrence of jumping red phenomenon.

Specifically, the reasons and solutions for grape jumping red are as follows:

Excessive flushing and fertilization of soil: Excessive flushing and fertilization of soil, especially premature use of potassium fertilizer, can lead to poor fruit coloring. The solution is to apply fertilizers reasonably, pay attention to the supplementation of trace elements, and avoid excessive use of potassium fertilizer.

Lack of trace elements: Lack of trace elements such as boron and zinc can lead to poor fruit coloring. The solution is to pay attention to supplementing these trace elements in the early stage of growth.

Improper use of hormones: Improper use of hormones or uneven application of medication can also cause jumping red. The solution is to use hormones reasonably and ensure even application.

Diseases and pests: Diseases and pests such as white rot and ulcer disease can affect fruit coloring. The solution is to strengthen the prevention and control of pests and diseases, and pay attention to the use and timing of pesticides.