I believe that the rice in the field in this time has entered the booting and heading! Rice panicle stage is an important period of rice yield, and it is also a period of multiple pests and diseases. Many pests and diseases are often in the same field, which is heavier in the years with more rainy days, which have different effects on rice yield and quality. Then talk about the recent pests and diseases!
May not pay attention to the prevention and control of the leafhopper in the early stage, but this year, the volume of the leafhopper broke out! When it was discovered that there were white leaves in the field, it was a bit late to fight drugs!
Rice leaf roller control:
According to the timely use of pest and disease information, 20% chlorantraniliprole (Kang Kuan) or 10% tetrachlorfenamide or 5% avermectin (including b1a) can be used 1-2 days after the peak of egg hatching. Or emamectin (a vitamin). When the disease is lost, the field can be replenished with 10% of the salt of Weiwei, 茚 å¨ (Dingdao).
"Inaba" is believed to be familiar to everyone! In the rice break, heading, poplar rain more than the rain, the greater humidity in the field is conducive to the incidence of rice false disease! The temperature is 26--28 degrees, which is most suitable for causing rice smut. If it continues to be cold, lack of sunshine and rain, it will cause a large area to occur!
Control of rice false disease:
Be sure to take medication 5-7 days before the break. Recommended medication: 430 g / l tebuconazole suspending agent 15-20 g, 300 g / l benzoyl propionate EC 15-20 g, 75% sputum · tebuconazole water dispersion granules 10-15 g, 45% thiofuran tebuconazole suspension 20-30 grams.
"The shells turn brown and black." Generally there are many kinds of situations, the first physiological, such that there are no particles in the general, the problem occurs at the booting stage, which leads to the failure of the booting, and the second is the browning of the fungus caused by the fungus, the grain mites, and the The series of problems, after the impact of wind and rain, phytotoxicity and other hull damage, husk browning, infected by saprophytic fungi, bacteria, actinomycetes and other symptoms will aggravate this symptom.
If it is bacterial, then there will be performance on the leaves. Physiological can be done without any control. There is no way to do this. The early management is improper. Fungi can add some copper preparations to control the spread in addition to normal control during the heading stage. The best way is to encounter the weather before breaking. Ok, you need to take the medicine in advance, don't wait after the rain. This bacterial type is based on the type of medication. It can be combined with control of ear mites, sheath blight, etc., and the mixture of thiazolone and azoxystrobin, thiazolidine and azoxystrobin, plus the mixture of propiconazole and difenoconazole, Ai Miao·B Cyclic azole, inhibiting contamination of panicle bacteria.
Like this white ear, there are more or less rice fields! There are many situations that can lead to white spikes :
1. Long-term high temperature during booting causes water shortage in the field. At the booting stage, the ears are affected, resulting in the empty ears of the extracted ears! Don't break the water when the temperature is high! Manage well!
2. There are borers in the field, causing insect damage. In many places last year, white spikes were caused by the breakout of the heartworm. During the heading period during pregnancy, it is necessary to strengthen the use of drugs to prevent and cure the heartworm, and pay attention to timely observation of the field.
3. White spikes caused by diseases such as rice blast and blast blight. If the field is heavier, it may be considered to combine the control of rice blast and other diseases at the heading stage.
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