Today, I went to the shed to see that many greenhouse tomatoes had different degrees of umbilical rot. The hazard rate was as high as 20%, and light was 10%, which greatly affected the product rate of tomatoes. We must pay attention to the prevention of the disease in advance in production. happened.
Symptoms of Umbilical rot: The onset of fruit-to-chicken to egg-sized young fruit, which sometimes occurs when the fruit is about to turn red, begins with the umbilical part of the fruit being immersed in dark green or dark gray, which quickly changes with the progression of the disease. Dark brown, flesh dehydration, lesions sometimes concentric ring pattern, generally do not decay, lesions are mostly round, when the air is wet, the disease is often rotted by some fungi, the disease grows black mold.
Cause: The absorption of calcium is inhibited for a variety of reasons.
Control methods:
1. Scientific fertilization: Do not apply large amounts of ammonium nitrogen and potassium fertilizers and increase organic fertilizers.
2, timely watering: soil moisture can not be drastic changes, or easily lead to umbilical rot.
3, leaf calcium: can spray 0.3% calcium chloride or calcium nitrate aqueous solution, Jiashi 100, Huaguo Bao and so on.
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