What kind of pesticides are used in rice diseases and insect pests

Rice is one of the most important food crops in Southeast Asia, which is often cultivated in southern China. Its cultivation history can be traced back to Hunan, China, about 12000-16000 BC. It is recorded in historical records that rice has been widely planted in the period of Dayu. So what pesticides are used for rice diseases and insect pests?

What pesticides are used in rice diseases and insect pests

The common rice diseases and insect pests are rice blast, rice sheath blight, bacterial leaf blight, Chilo suppressalis, Chilo suppressalis, rice planthopper and so on. Different diseases are treated with different drugs. When rice occurs, the types of diseases and insect pests should be determined according to the specific symptoms. Take targeted measures to prescribe the right medicine.

Rice blast is one of the most important diseases of rice, which can cause a substantial reduction in yield, with a yield reduction of 40% to 50% in severe cases, or even no grain harvest. The specific symptoms are gray-black at the base of the diseased seedlings, brown at the upper part, and finally lead to rice curling and death. When the humidity is high, a large number of gray-black mildew layers are produced in the diseased part. The main method of drug treatment is to use tricyclazole 20g~25g or 28g~40g spray per mu to control.

Rice sheath blight is one of the most common diseases in rice. Generally, early rice is more serious than late rice. When it is serious, it can cause plant lodging and death, also known as moire disease. The main symptom was that dark green water invading spots appeared on the leaf sheath near the water surface, and then gradually enlarged into long oval striated spots. The edge of the lesion is brown, the center is light brown to grayish white, when wet, the spot is grayish green, water invasion translucent. The main control method is to use Jinggangmycin 10g~12.5g and water 50kg spray twice per mu.

Bacterial blight mainly occurs in leaves and leaf sheaths. Translucent yellow spots appear at the leaf margin at the beginning, and then develop into wavy yellow-green or grayish-green spots along one or both sides of the leaf margin or along the midrib, with a clear boundary between the disease and the healthy part. The main method of chemical control is that in the areas with frequent occurrence of bacterial blight, foliar 30g~40g plus water 50kg spray is used to control bacterial blight in the early stage of the disease, especially after strong wind, rainstorm, flood and other disasters, rice leaves are damaged, so the above-mentioned pesticides should be sprayed in time to prevent the outbreak of the disease.

Chilo suppressalis (Chilo suppressalis) and Chilo suppressalis (Chilo suppressalis) are one of the most serious common pests in rice in China. It is easy to cause withered sheath and withered heart seedlings, withered booting and white ears, semi-withered ears and insect-damaged plants. The main method of drug treatment was that during the peak period of withered sheath of rice seedlings, insecticidal double 36g~45g or Shachongdan 45g~55g or triazophos 20g water 50kg were sprayed per mu.

Rice planthopper (Nilaparvata lugens) is one of the most common pests in rice. Adults and nymphs suck plant sap and do harm to rice and other crops. Their feces often cause mold breeding and affect the photosynthesis and respiration of rice. The damaged rice clusters in the field often start with dots and slices, and Yuanwang is yellow and shorter than normal rice plants. The main drug treatment was that when the number of bushes reached 1500 ~ 2000, every 667m2 was sprayed with buprofezin 7g~10g or imidacloprid 1.5g~2g and water 50kg, aiming at the middle and lower parts of rice plants.

The above are the main diseases and insect pests of rice. When planting rice, we should patrol the fields, observe the abnormal phenomena of rice, and take targeted measures to treat the diseases and insect pests in time.