How does grain crop rice get white ear disease to do? When will it happen? How did it happen? How to prevent it? What kind of medicine can be cured?

Rice white panicle disease is a common disease after heading, which occurs in all planting areas, and this disease will seriously affect the yield and reduce the benefit, so during the planting period, we must strengthen the management technology, then what to do if rice gets white panicle disease? When will it happen? How did it happen? How to prevent it? What kind of medicine can be cured?

Time of occurrence:

In the process of heading or during a period of time after heading, due to diseases and insect pests (neck blast of rice ear, stem borer, etc.) and mechanical damage, the development of rice panicle is terminated, and the stem tissue can not continue to transport water and nutrients to the panicle. Rice husk color whitening phenomenon caused by water loss.

Cause of occurrence:

1. Insect pests

There are still a lot of insect pests in rice before and after heading, generally dominated by Chilo suppressalis, Chilo suppressalis, Rice planthopper, Chilo suppressalis, etc., all of which can cause white ears of rice.

Chilo suppressalis: mainly harmful to rice plants, there are many small holes in the stem, which are left by Chilo suppressalis.

Stem borer: first harm in the ear bracts, and then slowly down to feed, it can bite off the stem of the ear, usually in groups.

Rice planthopper: there are many species, and we will not discuss which one here. When the rice is in the heading stage, if the temperature is right, it will usher in a big outbreak and do great harm by sucking the sap from the rice plant or panicle neck.

Chilo suppressalis: the harm is similar to that of Chilo suppressalis, but the hole left after the damage is larger than that of Chilo suppressalis.

2. Disease

There are also many diseases causing white panicle of rice, such as rice blast, sheath blight, evil seedling disease and so on. Here are their symptoms and hazards.

Rice blast: due to the different damage period and position, rice blast can be divided into seedling blast, leaf blast, node blast, ear neck blast and grain blast. In the heading stage, if the occurrence of node blast and panicle neck blast is serious, it is easy to lead to white ear, generally more rainy weather, the disease will be more serious.

Sheath blight: if the rice field is irrigated with sewage for a long time or is planted too densely, the incidence of sheath blight will be serious. In addition, the high temperature and humidity weather is also an important factor in the incidence of sheath blight. Irregular gray-green or grayish-brown spots.

Evil seedling disease: also known as overgrowth disease, the growth is higher than normal rice, but the leaves are narrow and long, the color is yellow, the root growth will also be frustrated, some will not heading, some will not bear fruit after heading, forming white ears.

3. Other reasons

Other reasons are mainly caused by climate, and there are three common ones:

Drought: when the field is too dry before and after heading, the relative humidity is less than 50%.

Rainy: it rains continuously before and after heading, affecting its normal heading or non-fruiting after heading.

High temperature: when rice is at heading stage, it is sensitive to temperature. if the temperature is higher than 35 degrees, it will lead to pollen dysplasia, unable to fertilize normally and affect heading.

Prevention and control measures:

The main results are as follows: 1. The varieties with strong disease and insect resistance can be treated by seed dressing before sowing.

2. Water and fertilizer management should keep up. Measures such as base fertilizer, topdressing, drainage and backwater will not be introduced in detail here. Interested friends can pay attention to it.

3, pest control, this article directly refers to chemical agents, Chilo suppressalis, Chilo suppressalis, Chilo suppressalis all belong to Lepidoptera pests, the available pesticides are methyl chlorpyrifos, Kangkuan, Bacillus thuringiensis, fluorodiamide and so on, if rice planthopper, you can choose enpyrimidine, fenvalerate, deltamethrin, buprofezin, pyrazidone and so on.

4. disease control: it is also a direct chemical, rice blast can choose rice blast, triadimefon and prochloraz, sheath blight can choose propiconazole, uniconazole, hexazolol, oxamidazole and other insecticides. Evil seedling disease can choose oximiaoling, imidamide and other agents.