Farmers have more pests and diseases during the cultivation of lettuce, among which the lettuce sclerotinia is the most serious(propagation tray). Once the lettuce is infected, it will reduce the yield and quality of lettuce, and even lead to the production of lettuce. So what are the symptoms and pathogenesis of lettuce sclerotinia? How to prevent? Watering, when the weather is dry(greenhouse supplies pots), the field of early autumn cabbage should be poured with small water, in the rainy season, remember to drain in time.(plastic 20 gallon nursery pots wholesale)
The occurrence of sclerotinia sclerotiorum is closely related to climate and management level(plug trays). The germs can be transmitted through airflow, rainwater and farming. In terms of fertilization, 15 kg of urea per mu is applied. In the sapling period and the rosette period, 20~25 kg of urea is applied separately, and it can be applied with water. Early autumn cabbage can be harvested and marketed after about 15 days of sowing(plastic grow pots). When picking, two or three leaves on the outside of the leaf ball can be kept for the purpose of protecting the leaf ball.
At the beginning of the disease, the base of the stem near the ground was firstly damaged(gallon plant pot). The lesion is initially brown and water-stained, and then spreads to the entire stem, so that the base of the stem is softly rotted, and the cotton mycelium is densely formed in the affected part. The sclerotia is produced in the later stage, and sometimes the crack is formed at the base of the stem. The sclerotia is initially white, and then gradually becomes a black granule of rat feces(flat plastic tray). Usually, the rot caused by Sclerotinia sclerotior has no stench and is different from bacterial soft rot.
(plastic 20 gallon nursery pots wholesale)Matters needing attention: Field management should be strengthened. After the seedlings are fixed, it is necessary to rotate the drugs(cell trays). Pay attention to the safety interval of pesticides. Lettuce, also known as lettuce, is one of the most popular vegetables. The demand for fertilizer is large, and many farmers have planted it. After the lettuce is infected, the leaves of the lower part of the plant become soft and brown, and the disease develops upwards(wholesale greenhouse pots). The upper leaves are wilted and wilt, the stems are ill, the plants are poorly grown, and the whole plant is dead or lodging.
When the temperature is 35 ° C high, the disease is difficult to occur(1 gallon nursery pots bulk). The field with low terrain and easy accumulation of water has high humidity and high incidence. In the middle and late growth stages, the old leaves, diseased leaves and weeds of the base are not removed in time, which is conducive to the onset. There are pathogens in the former crops(seed starter trays). In addition to endangering lettuce, lettuce can also infect cabbage crops such as cruciferous, eggplant, pepper, and potato. It does not pay attention to seed treatment and partial application of nitrogen fertilizer.
(plastic 20 gallon nursery pots wholesale)50% procymidone WP 800 times solution, 50% prochloraz WP 1500 times solution, 0.5% berberine water 400-600 times solution(black plastic plant pots), 50% boscalid water dispersible granule 1200 Spray the base of the stem, the old leaves and the ground with a double liquid, etc., and spray again once every 7 days. The diseased field and the gramineous crops are rotated, or the water is immersed in the high temperature field in summer(square nursery pots), and the greenhouse is used for high temperature suffocation, which can reduce the pathogenic bacteria in the field.