First, the main features of the umbilical rot:
The umbilicus of the young fruit was initially immersed in dark green lesions, and the diseased part soon turned dark brown or black, and its subcutaneous tissue collapsed and contracted, causing the diseased part to appear flat.
Second, prevention and control measures:
1. Strengthen field management and ensure a balanced water supply.
2. Choose strong water retention and grow thick soil.
3. Avoid using nitrogen fertilizers that are too concentrated or contain too much nitrogen.
4. Within 30 days after fruiting, tomato can be sprayed with 1% superphosphate, 0.1% calcium chloride or 0.1% calcium nitrate.
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