Pay attention to three precautions of rice after flood

From mid-late June to mid-late July, the southern region is often hit by torrential rain, and some areas are prone to floods. In case of flood and waterlogging disasters, in addition to carrying out routine remedial measures, attention should be paid to the prevention of the epidemic of bacterial diseases and the outbreak of migratory pests.

Prevent the epidemic of bacterial brown stripe disease. With the flooding, the bacteria were able to spread and spread and infect through the wounds caused by Rain Water and rice plants during the flood. The resistance of flooded rice plants decreased, which was more conducive to the epidemic of the disease. There is a process from the flood to the epidemic of the disease. therefore, the middle rice and late rice in the flood area should be inspected frequently and should not be careless. In mid-June 2003, there was a series of torrential rain in Mengxi, Tongziping and other villages in Xinshao County. after the rainstorm, bacterial brown stripe occurred in the late-maturing middle rice in this village. the heart leaves of some late-maturing middle rice turned yellow and curled, and "withered heart seedlings" appeared. Some farmers used it as a drill worm to control it, but it didn't help. Unlike the drillworm, the withered heart seedlings caused by bacterial brown stripe disease have no wormholes, no insect dung, no insects, and the base is yellow and rotten, with a foul smell. The whole plant is involved, the growth is slow, and the whole plant dies when the disease is serious, which is a common symptom at the tillering stage. at the seedling stage, the disease is often characterized by the appearance of water-stained green stripes on the leaf base or on the leaf sheath, which turns to light yellow and extends up and down along the leaf veins. and finally gradually turn into dark brown stripes. At the heading stage, brown stripes or heart rot appeared in the flag leaves and their lower leaves and leaf sheaths. The diseased plants heading 3-5 days earlier than the healthy plants, and significantly higher than the healthy plants. The ear neck showed brown stripes, and in severe cases, the ear neck turned brown. Some or all of the withered ears and branchlets turned brown, bent, turned into deformed ears, unfruitful, and sometimes semi-wrapped ears or stillbirths appeared. All diseased plants can produce yellow-white bacterial pus when the humidity is high, and there is a fishy smell in the field when the disease is serious. In order to control bacterial brown stripe disease, on the basis of drainage and open field, 20% Ye Qing Shuang 600 × 800 times liquid or 5% Shidu Qing 300 times 400 times liquid should be sprayed once every 5 ~ 7 days for 2 times in a row.

To prevent the epidemic of bacterial leaf streak after rainstorm. Rainstorm is often accompanied by strong winds causing a large number of wounds in rice plants, which is conducive to the invasion of bacteria, high temperature promotes the expansion of disease spots, and high humidity is conducive to the spread of bacteria. When the disease occurs, there are yellow-brown stripes between the veins of the leaves, which can be more than 1 cm long, showing translucency to the light, and there are many wax-yellow bacterial pus on the disease spot. The prevention and treatment of this disease should be prevented from series irrigation. 20% Ye Qing Shuang 600 × 800 times liquid and 5% Shiduqing 300 times 400 times liquid should be used alternately, generally twice, once every 5-7 days, and bacterial blight should be treated at the same time.

A sudden increase in the prevention of migratory pests. The third and fourth generations of rice leaf roller larvae (often overlapping generations) damaged middle rice from booting stage to heading stage, and the third generation brown planthopper (the main type of rice planthopper) damaged rice in August. These two migratory pests come not only from local insect sources, but also from wind and rain, especially those falling from the north to the south with the inverted trough air flow during heavy rain. Therefore, the sudden increase of these migratory pests often occurs during the rainstorm. Pay close attention to the investigation after the heavy rain. When the leaf curling rate reached 7%-9% at tillering stage and 5%-7% at booting stage, it was sprayed with 5% fipronil 600 × 800 times. When the nymphs of rice planthopper reached 1500 nymphs, 10% aphid was used to control the nymphs (once net, great hero, imidacloprid, Kangfuduo) 2500 × 3000 times.