Identification and prevention of watermelon disease

The watermelon disease is also called Phytophthora. The high temperature and rainy development is very fast, and the poorly drained land is easy to reject. Leaves, vines and fruits can be affected.

The pathogen will lurk in the soil of the diseased plant in the soil for the winter, and the second year will spread with the air and water. The suitable temperature for the development of pathogens is about 30 °C.

How to identify Phytophthora:

Onset on the leaf: produces irregular spots of dark green water stains, which spread quickly and appear soft and rot. When dry, the lesions turn brown and are easily broken.

Incidence on the vine: Most of the disease occurs near the middle and lower parts, dark green water-stained diamond-shaped spots, soft rot when the humidity is high, becomes taupe when dry, and dry. All the above patients died.

Onset of the fruit: dark green round spots, spreading quickly, the disease minister has white mildew.

Seedling incidence: The roots are yellow, similar to water. The cotyledons grow a nearly round water-stained dark green lesion, and the seedlings quickly collapse.

Incidence pattern:

In the south in mid-May and early June, the rainy season is the peak of the epidemic

In the north, during the months of July and August, it is easy to get sick after the rain and spread rapidly.

Control method:

Increase the application of phosphorus and potassium fertilizers;

Rotating with non-vine crops;

Try to choose sorghum (qí) cultivation;

In the early stage of the disease, the diseased leaves and diseased vines are removed in time;

Even if it is drained, strengthen the anti-mite; clay ground, try not to flood;

Spraying during the onset, metalaxyl, mancozeb, carbendazim, once a week, continuous prevention 3 to 4 times.

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Material	HDPE	HDPE	HDPE	HDPE	HDPE	HDPE	HDPE	HDPE	HDPE
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