What happened to the dead cucumber seedlings?

(agricultural get Rich Network) recently, some farmers report that their own cucumbers often have dead seedlings. I would like to ask what is the cause. Dead cucumber seedling is the symptom of cucumber blight, and the obvious difference between it and Fusarium wilt is that the vascular bundle does not change color. It may occur when it is sunny after rain, watering time is too long, even rainy days, continuous cropping time is long, planting density is high, and drainage is not smooth.

The disease-resistant varieties should be selected for the prevention and control of the disease, and the land with high topography and energy drainage should be selected for cultivation, and plastic film mulching and high border cultivation should be adopted to prevent flood irrigation and keep the ground dry. Watering after melon can not be flooded and watered frequently; do not stubble with cucurbitaceae vegetables; using black-seeded pumpkin as rootstock grafting can also prevent and cure the disease.

Once diseased plants are found, deep burial should be removed immediately, and chemical control should be used. 50% Ruidu manganese and zinc 600 × 800 times liquid can be used for spray control, and 25% Ruidomycin and 50% thiram can be mixed with 1 ∶ 1 to irrigate the roots. Each plant can be irrigated with 200kg 250ml of root every 7 days.