Symptoms of wheat nematode disease: Symptoms may be present at the seedling stage to the mature stage, and the symptoms are typical for the ear. The ten seedling mouths are shriveled and distorted. The leaves are pale and tender, and the tips of the leaves are often wrapped in leaf sheaths. The new leaves are sometimes deformed. Severe shrinkage withered. Before heading, the stems and nodes of the diseased plant were inflated and bent. Occasionally, there were tiny round protrusions and insects on the leaves. The ear showed short performance, the glume was open, and there were awns and awns. The awns were obtusely horned or twisted, and the grain became part or all of the worms. Insect mites are shorter and thicker than Jianpian, nearly spherical, initially oily green, and later turned yellow-brown to black-brown, with a small hook at the top, similar to the shape of wheat stalk smut, cut insect mites, containing white filaments Nematodes, such as adding a drop of water, swim for a while now. The morphological characteristics of pathogens: belong to Nematodes. Adult eyes can see that the insect body is linear, with two ends pointed and the head more blunt. Characteristics of the disease: The larvae in the galls have a strong ability to resist adverse environments. Insects mixed in the seeds are the main source of far and near distance transmission. The insects that fall into the soil during harvest are not likely to survive and have little transmission. When wheat seeds and insects are sowed simultaneously into the soil, the insects suck and soften, and the instar larvae drill insects. When the seedlings unearth, the larvae wound the wheat with a needle, invade the tissues, and crawl upwards as the seedlings grow. , Young spikes, parasite life in seed ovary camp. After autumn sowing in winter wheat, more rain is conducive to nematode infection and the incidence is heavier.
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