Prevention and control methods Because rice blasts are very small, under normal circumstances, it is not easy to attract people's attention. It is only discovered when rice is seriously damaged and leaves a large number of leaf curls. Therefore, it is necessary to promptly inspect and eliminate the rice thrips in the larval stage. Use 40% Dimethoate Emulsion 1500~2000 times per acre. After applying the pesticide in Putian and Datian, keep the water layer. After the control of rice thrips, it is necessary to make up for the quick-acting fertilizers and to promote the growth of seedlings and tillers.
The brown planthoppers and flyback hoppers are the most harmful to rice planthoppers. Rice planthoppers generally hide in the leaf sheaths and stem tissues of rice plants in the middle of the paddy field, sucking juice from rice stems, and irregular brown spots appear on the damaged part of rice seedlings. In severe cases, the base of the rice plants turns dark brown. . As the stem tissue is destroyed, the nutrients cannot rise, and the rice plants wither and die, or fall down. After rice heading, the lower rice stems are senescent, rice planthoppers transfer the upper shoots, and the rice grains become empty shells or semi-semi-granules. At the same time, Laodelphax can transmit rice virus disease.
Control methods Drip oil kill insects. 400-500 grams of waste diesel oil or waste engine oil per acre is dropped, and there is a shallow water layer of 20 cm in Tanaka. Artificial insects are hurried and the insects die of oil and oil. Replace the clean water after the treatment, after the booting period hanged this method; poisonous soil. 1.5 kilograms of dimethoate flour and 2 kilograms of wet fine soil were applied per acre; spraying was applied. Use 40% Dimethoate 0.5 kg water 800-1000 kg spray.
Rice borers Rice borers, also known as leaf curl insects, often occur once in a few years, resulting in a significant reduction in rice production. The adults are auburn butterflies. The larvae harm the rice. After the rice leaves are damaged, they are cut off. In severe cases, only the veins are left. The rice stalks are like brush pots. In particular, after rice was attacked at the booting stage, larvae spun silk and conjugation together the rice leaves to form a curled rice ear, which prevented ear emergence and affected yield.
Control methods Use 2.5% trichlorfon powder per kilogram of 2 kg of powdered powder or A6 powder plus 1 kg of fine soil and 10 kg of toxic soil. Use 90% crystals of trichlorfon to add 150 g of water and 80 to 100 kg of spray.
The rice larvae of the rice leafroller Japonica rice larvae began to spit in the heart of rice leaves and rolled the leaves into tubular insect worms. The insects hid in the larvae to feed on the leaf and upper epidermis, and then headed to the tenderer leaf sheaths after heading. Internal hazards. In severe cases, only the transparent, whitish epidermis remains when the leaves are rolled, and the whole leaves die.
The control method used 25% two three three emulsion 250 times liquid and 90% trichlorfon 1000 to 1500 times spray. The prevention and treatment time should be controlled before the larvae's 3rd instar, and they should be treated with the best drug in the evening. After the prevention and treatment, the effect should be checked. If the density of the larvae is the same as before, it should be treated again.
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