Symptoms of root tip damage, thicker and distorted, nodule enlargement, nodule ovoid round, white, later developed into a long oval, slightly pointed at both ends, color brown to brown and even black, size 37 (mm), soft gradient Rot, rot, easy to break the skin. When nodules appear in the 1/3 root system at the seedling stage, the disease is weak, the leaves are pale, and the greenness is slow. The number of nodules in the tillering stage increased significantly, the diseased plants were short, the leaves were yellow, the stems were fine, the roots were short, and the growth was weak. The heading stage showed that the diseased plants were short, the panicles were short and few, and the panicles often spiked, or the panicle section wrapped, and the seed setting rate was low, and the pods were more. Hainan, Guangdong, Guangxi and Yunnan all occur. The pathogen Meloidogyne oryzae Maas, Sanders & Dede. called rice root knot nematode, is a linear animal door. Female eggs are oval to kidney shaped. The second-instar larvae and males were linear in shape, with body lengths of 545 μm and 1667 μm, and oral needles of 14.2 μm and 19 μm, respectively. Mature females are milky white, with slender heads and necks. The other parts are inflated into round pears, and the back of the body is tapered. The female oocysts have a perineal oval shape with a moderately arched height. Its morphology is similar to that of M. graminicola. Transmission routes and onset conditions The disease is 1-2 years old larvae wintering in root nodules. In the following year, the second-infested larvae invaded the roots of rice and parasitized between the root bark and the middle column, stimulating the cells to form nodules, and the larvae became adult by four times of depigmentation. After maturation, the females lay eggs in nodules and form first-instar larvae in the eggs. After a single peel, the second-instar larvae break out of the shell and leave the root nodules and move in the soil and water to invade the new roots. Nematodes can be transmitted by water flow, fertilizers, agricultural implements and agricultural activities. Nematodes only infect new roots. In acidic soils, sandy soils are heavy, and fertile soils with increased organic fertilizers are heavy. Continuous cropping of rice, light crop rotations, disease, heavy paddy field disease, drought sickness; winter infestation, disease, ploughing and drying field disease is light. Dry field shovel is lighter than pull disease. The incidence of lime increased significantly in the field.
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Prevention methods (1) The disease-resistant varieties Qiuchang 39, Kexi 661, and Japanese dwarf cultivars were mildly affected. (2) The implementation of flood and drought rotation, or rotation with other crops for more than six months. Winter tillage reduces the amount of insects. (3) Increase the application of organic fertilizer and apply lime of 75-100 kg per 667m2 before or after planting. (4) Drought-raising, shoveling, and transplanting to reduce the number of insects on the seedlings. (5) Chemical control. Use 10% Ke-line phosphorus granules to apply 3kg per 667m2 or 5% carbofuran granules 1-2kg or 92% Bataan liquid 6000-8000 times soak for 48 hours.
