![<?echo $_SERVER['SERVER_NAME'];?>](/template/twentyseventeen/skin/images/header.jpg)
Rice seedling disease is commonly known as male rice, long-term disease, caused by Fusarium oxysporum. In recent years, there have been various episodes of rice in various classes, and the incidence trend is increasingly severe. The general incidence rate is 0-3%, and the severe incidence rate is 60%. the above.
Hazard symptoms:
(1) Seedling period: The disease is severe and does not germinate or can not be unearthed or died shortly after being unearthed. The pathogenic strains with mild incidence are mostly slender, weak, and the sheath is elongated. It is nearly 1/3 higher than the healthy plants, with light color, narrow leaves and poor root development, which are typical of long-term symptoms. A small amount is smaller than a healthy plant. Most of the diseased plants died at the seedling stage, and died within 25 days after a small amount of transplanting. More than 50% of the beds
(2) Honda period: There are 3 types of diseased plants.
1 Long type: The diseased plant shows that the leaf sheath is elongated, about 1/3 higher than the healthy plant, with less or no tillering. The leaves are narrow and gradually yellow from bottom to top. In the middle and late stages, the roots appeared, the leaf sheath became brown, the roots became black, and the stem became soft in the later stage. The whole plant died and the white to pink white mold appeared on the dead plant.
2 Ordinary type: the disease plant height and health are appropriate, near the leaf color, some of the onset is fast, 2 to 3 days, the emergence of roots, and soon died. Some of the onset of the disease lasts for a long time, except for the other symptoms on the surface of the roots, and the yellowing is not seen until 20 days or more.
3 Early panicle type: The diseased plant is characterized by early heading, about 3 to 7 days earlier than the healthy plant, and the head is higher, the ear is small, and the white ear is 6 to 10 days, and the white ear is not strong and full.
The characteristics of the occurrence of mite disease:
The diseased fungus grows fastest at 30-35 °C, although it can multiply at 20-25 °C, but the speed of reproduction is slow, and the bacteria are obviously pressed at 40 °C. Typical symptoms usually occur within 25 to 30 days after transplanting. Infection: After the seed is inoculated, the pathogen invades from the bud, root and root crown, causing the disease of the seedling. The conidia of the diseased plant can cause re-infection from the wound invading the infected seedling and causing the disease in the field. When the rice is flowering, the conidia are infected with the attacking seed on the flower. At the time of threshing, the conidia of the diseased seed adheres to the disease-free seed and causes the diseased seed again.
Incidence period: Rice may be infected with pathogenic bacteria for a lifetime.
1. Bacterial source: The number of seed-borne bacteria has a great relationship with the incidence of seedling disease. The higher the seed carrier rate, the heavier the disease, but the disease is not a quarantine disease.
2. Environment: The temperature is most suitable at 35 °C, and the induced length is most obvious at 31 °C. At 25 °C, the diseased seedlings are greatly reduced.
3, training: Where high temperature germination, seedling bed high temperature treatment of the incidence. When the soil temperature is at 35 °C, the pathogen is most likely to damage the rice plant, and the most obvious is the length at 31 °C.
Control method
1. Agricultural control: Mulberry seedling disease does not belong to the scale of seed quarantine. The amount of seed-borne bacteria does not have a specified scale. It is a useful measure to prevent seedling disease by purchasing qualified seeds and using useful agents for seed treatment.
2, chemical control: seed treatment is the only way to prevent and cure disease of the disease, using carbendazim, dithiocyanomethane, prochloraz as the main ingredients to control the disease, it is now fundamentally on the seeds Invalid; Jin Hu, Fuer Tire Zhuang and so on are the best products in the market.
3, prevention and treatment claims: advocate rice farmers in the selection of pharmaceuticals, select the market for good control, use a large number of products
4, how to cure the disease? In addition to seed treatment to control the disease, the seedlings will not be treated once the disease.
Reno Mattress,Reno Mattress Box Gabion,Gabion Baskets,Gabion Wall Mesh
ANPING HONGYU WIREMESH CO.,LTD , https://www.hongyufence.com