Rice is black, how to treat it?

Browning ear is a disease caused by Alternaria alternata and a fungal disease. When rice leaves the ear, it turns reddish brown and black. The focus is irregular, and there is no mildew layer on the focus, but the boundary between disease and health is obvious. If you are seriously ill, there will be hollow grains and black grains. Polyoxin can be used for prevention and treatment.

The early temperature is low, and the seedlings don't like to grow. In order to raise seedlings, the amount of nitrogen fertilizer is large, but the response of fertilizer efficiency is slow, and nitrogen fertilizer can not be released in time at low temperature. When the last leaves grow out, the temperature is high and the fertilizer effect is obvious. In addition, at the end of tillering stage, the field dryness can not meet the requirements, the root system is underdeveloped, and there are many fertilizers at booting stage, and the fertilizer-efficient leaves all react to the last two pieces.

The last two leaves are longer, bigger and tender than normal years. However, at the heading stage of rice, the weather is hot, windy and rainy, leaves are easily injured, infected with germs, and the condition will be aggravated. Such as bacterial brown spot, sheath rot and brown ear disease, which are easily mixed when heading, showing red leaves, red sheaths, red grains, black grains, red ears and black ears. Comprehensive prevention and control must be done.

Extended data:

Integrated control of rice

Spraying drugs twice before heading and after heading can control many diseases of rice. One liquid and three medicines prevent many diseases. Ensure a bumper harvest.

1, formula 1:

30% tromethamine 30 ml

2% kasumin 100ml。

3% polyoxin 100 ml;

2. Formula 2:

75% hold the enemy steady 15g.

2% kasumin 100ml。

3% polyoxin 100 ml;

3. Formula 3:

2% kasumin (kasumin) 80 ml.

25% prochloraz 60ml

3% polyoxin 80 ml; ?

4. Formula 4:

50g of 20% rice blast amide.

80 ml of 2% calories Su Ming

3% polyoxin 80 ml;

5. Formula 5:

2% Su Ming 80 ml,

50% carbendazim100g, or 70% thiophanate-methyl100g)

3% polyoxin 80 ml;

6. Formula 6:

20% tricyclazole 80g

2% kasugamycin 80 ml

3% polyoxin 80 ml;

7. Formula 7:

Add100g rebate (mixture of tricyclazole and kasugamycin).

Polyoxin 80 ml.

After these drugs are compounded, the combined fungicides can be selected before 8-9 a.m. or after 4 p.m., and water can be reasonably distributed according to the application method, and 1 mu of land (667m2) can be sprayed on the stems and leaves of rice plants.

Spraying fungicides once before heading and once after heading can control red leaves, red grains and black grains caused by bacterial brown spot, brown ear disease and sheath rot. At the same time, it can also control rice blast, flax leaf spot, sheath blight and other diseases.

Baidu encyclopedia-Alternaria alternata