10% difenoconazole, 25% benzalkonium bromide, 20% flusilazole prochloraz and 43% tebuconazole were selected as therapeutic bactericides, and 70% metformin, 80% mancozeb, 25% azoxystrobin and 50% pyrazolyl azoxystrobin were used together to treat diseases at the same time.

Cause of disease:

This disease is an important disease in cucumber production, which mainly harms leaves, especially in the middle and lower leaves.

At the early stage of the disease, the lesion showed water-stained spots, then turned light brown, with a light color in the middle and a water-stained light green halo around it. The focus is small, with a diameter of about 65438 0 ~ 3 mm.

In the later stage, the middle part of the lesion is tissue-like, pale yellow or grayish white, fragile and easily broken. When the humidity is high, there will be several inconspicuous black spots on the lesion, which are conidia of pathogenic bacteria.

Extended data:

Pathogenic conditions and laws

The pathogen of cucumber spot disease overwinters in the soil with the disease residue, and spreads in the field through rainwater splashing or irrigation water.

Generally speaking, the disease is serious in warm and rainy climate, continuous cropping, poor ventilation and high humidity.

Prevention and treatment

Disease-resistant or disease-tolerant varieties should be selected in disease-prone or disease-prone areas. Rotation with non-melon vegetables; Strengthen management and fitness cultivation during cucumber growth;

Small water should be poured frequently, and it is forbidden to flood, so as to eliminate water in the field in time after rain; Clear the garden in time after cucumber harvest to reduce the source of bacteria in the soil.

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