Watermelon diseases and pesticide control of the method of sudden collapse disease, standing blight.

1, sudden collapse disease

The period of occurrence: mainly for the infestation of unearthly and just out of the soil seedlings. Recognition points: stem base rot, seedling sudden collapse, white mycelium in high humidity.

Sudden collapse disease, in the nursery or seedling stage, is a particularly serious disease, usually the stem base of the seedlings will appear, mainly manifested as a large number of water-impregnated spots at the base of the stem or rhizome, the seedlings can not stand up and sudden collapse, and later will be dried and shrunken into a line. When the humidity is high, there are white flocculent mycelium at the base of the stem next to the soil.

Sudden collapse disease is a low-temperature, high humidity disease, seedlings in the shed temperature is relatively low in the case of the occurrence of the most suitable for the onset of the disease, usually at 15-20 degrees, and humidity, if reached. In the seedling stage is a destructive disease, temperature and humidity control is not good, in the seedling may be a total loss!

Prevention and control: before seedling, spread a layer of soil on the seedbed, and then spray a layer of medicine on the seedbed soil after sowing. Commonly used drugs, such as oxamyl manganese zinc, fine methomyl, allyl frost urea cyanide, frosty mildew hydrochloride.

2, standing wilt

The period of occurrence: mainly occurs in the late seedling. Points for identification: brown spots at the base of the stem, constriction and drying of the diseased part, and a cobwebbed layer of light brown mold in the late stage

Ribbling blight is a relatively common disease in the seedling stage. Watermelon blight mainly affects plant root tips and roots, the first onset of oval brown spots at the base of the seedling stem, leaves wilted during the day and recovered at night, then the spots gradually sunken, the development of a week around the stem when the diseased part of the constriction of the dry, but the plant is not easy to fall over, was standing blight.

Rising blight is relatively late compared to sudden onset disease, and is generally more likely to occur in the later stages of the seedling (after the later seedling stems are lignified, it is easy to get rising blight). Because seedlings in the late stem is thicker, and has been lignified, so after the disease, although the onset of the disease, but it is not easy to fall, this point and sudden collapse disease is different.

Lithiasis can also grow white mold when humidity is high, and in the later stage, it will produce a spider web of light brown mold, which can be distinguished from sudden collapse disease. In addition, the onset temperature of the disease is a little higher than the sudden onset of the disease, the disease is generally easy to develop at 17-28 degrees Celsius.

Prevention and control: use Fosetyl or quintozene or carbendazim to mix with the soil to prevent and control the disease, use 8 grams of the drug per square meter and mix with the soil. Later, if you find that there is a blight, use oxacillin and etofenprox to irrigate the roots.

Watermelon planting notes

There are many varieties of watermelon, some watermelon is delicious but not easy to survive, some varieties of general, but the vitality of the strong, it depends on their own preferences, if not too insider, you can consult with those who specialize in cultivation of watermelon seedlings of farmers.

Planting watermelon, in addition to the variety of watermelon, but also to consider the planting of the soil is appropriate, if the more fertile soil planted out of the watermelon will certainly be very good, if the soil is too poor soil watermelon seedling planted less than three or two days will be wilted, so the choice of soil is also very important.

Watermelon seedlings just planted, it is best not to put too much fertilizer, and the distance between each watermelon seedling and fertilizer is best about 50 centimeters away from each other, too close, watermelon seedlings are relatively young, the fertilizer is too salty, it is easy to wither, and fertilizer is too much also only grow seedlings do not grow melon.