Causes and Control measures of Bad Seedling Disease in Rice

How does rice appear evil seedling disease to do? Rice evil seedling disease is commonly known as male rice, once it appears, it is bound to affect the normal growth of rice, and then, in view of this problem, talk about the causes and control measures of rice evil seedling disease in detail.

? First, the law of the disease

The pathogen can also survive the winter as conidia attached to the seed surface or mycelium lurking inside the seed and the ascomycetes growing in the rice straw. The pathogens were mainly spread by diseased seeds. After the diseased seeds are spread, the seedlings will suffer. The pathogen makes semi-systematic expansion in the plant, secreting gibberellin to stimulate cell growth and causing overgrowth. The mycelium of immature diseased rice straw can also cause the disease. During the growing period of Honda, the conidia were transmitted by wind and rain, which invaded from the plant wound and caused re-infection.

? Second, symptoms

It can occur from seedling stage to heading stage. In seedling stage, the diseased plant was nearly 1% higher than the healthy plant. 3 the plant was thin and weak, the leaf was narrow, the leaf sheath was elongated, the leaf was light green, the root developed poorly, the number of root hairs decreased, sometimes there was excessive root splitting, and most of the diseased plants died before or after transplanting. The diseased plant appeared about a month after it was inserted into Honda, and the disease condition was similar in the seedling stage, with little or no tillering, the Internode elongated significantly, the node exposed outside the leaf sheath, and many adventitious roots grew on it, especially many basal internodes, which were the characteristics of the disease.

III. The period of onset

The main results are as follows: 1. The source of bacteria: the rice varieties with less bacteria should be selected, the higher the seed carrying rate is, the more serious the disease is, but the evil seedling disease is not a quarantine disease.

2. Environment: the temperature of 35 ℃-31 ℃ was the most suitable to induce overgrowth, and it could not grow above 40 ℃ or less than 2 ℃.

3. Management: the germination temperature is too high, and the disease caused by high temperature management of seedling bed is more serious.

? IV. Prevention and control methods

1. Self-control: buy qualified seeds with less germs.

2. Chemical control: soaking seeds with carbendazim, dithiocyanate methane and imidamide alone can not achieve the effect of controlling evil seedling disease. It is recommended to use 25% cyanoprostol suspension to soak the seeds.

3. Occurrence of evil seedling disease: the prevention and treatment of evil seedling disease occurs in the seedling bed. It is recommended to spray it on the seedling bed after dilution to control the disease.