What should I do if the bitter gourd leaves are yellow?

Bitter gourd is better to plant, because the bitter melon's crying prevents a lot of pests from invading, but bitter melon seedlings are as fragile as other vegetation. Let's introduce the reason why the cucumber leaves are yellow and the stems are dead:

This reason is likely to be bitter gourd blight, which occurs in the production of bitter gourd in the shed, mainly affecting leaves, stems and fruits. The leaves are infected, and the brown round lesions appear in the beginning, with a taupe in the middle. The stems are infected, the initial lesions are elliptical or fusiform, and the irregular shape is irregular, grayish brown, and the edges are brown. When the condition is serious, the cracks on the vines appear to burst, and the main basal cracks also flow out of gray and red. Gummy liquid, commonly known as "explosive blood vessels"; after the side cleavage, it produces a white oil. In severe cases, the whole plant died, and the vines were russet after drying. The fruit is immersed in water-immersed small dots and gradually turns into yellow-brown sag. The diseased melon is easy to break in the later stage, and the diseased part also produces black small grain spots. The lower part of the lesion is mostly "black rot".

Incidence conditions:

The seed can be infected with the seedling stage. If the nitrogen fertilizer is applied to the shed in the management process, the disease will be heavier.

Control method:

1. Grafting control: use loofah as rootstock and bitter gourd as scion. Firstly, the loofah and bitter gourd seeds are disinfected and planted separately in the nursery. When the loofah grows 3 true leaves, the bitter gourd seedlings or young shoots of the roots are cut into ears, and the tongue is grafted onto the loofah. Cut the loofah vine again. Wait for the bitter melon to grow 4 pieces of true leaves and then colonize.

2. Rotation with non-melon crops: It can be used for 3 to 4 years with the solanaceous vegetables to destroy the living environment of pathogenic bacteria and reduce the number of pathogens.

3. Seed disinfection: (1) After soaking in 56-degree warm water until natural cooling, continue to soak for 24 hours, then germination under 30~32 degrees, sowing after germination. (2) Soak seeds with 50% hydrogen peroxide for 3 hours, then rinse with water and seed.

4. Strengthen management: strengthen the management of fertilizer and water, promote the use of seaweed fertilizer or active organic fertilizer, increase the application of phosphorus and potassium fertilizer, avoid partial application of nitrogen fertilizer, and pay attention not to overfill large water and maximize soil permeability. The shed should pay attention to scientific wind and humidity. If the shed temperature should be raised to 30 degrees or more for 2 hours, then open the air vent to release air to play the dual role of ventilation and drainage.

5, chemical control: the initial stage of the disease can be used 50% sulfur suspension 800 times solution, 86.2% copper master wettable powder 1500 times liquid, 80% spray WP 600 times liquid spray control, 7 days, 3 times in a row.

Therefore, although bitter gourd is better, but want to eat bitter gourd is not sloppy, but also need to carefully manage bitter melons.

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