The symptoms are also called wheatgrass nematode disease. The diseased wheat has symptomatic symptoms from the seedling stage to the mature stage, and it is the most obvious to form worms on the wheat ear. The damaged wheat seedlings are short-leaved, wrinkled, yellowish, and erect, and severely shrivelled. Before the heading, the leaves of the diseased plants can shrink, the leaf sheaths are loose, and the stems are twisted. After the booting stage, the diseased plants are short, the stems are hypertrophied, the internodes are shortened, the heavy-vegetated ones are not able to head, and some are able to head but are not strong but become insects. Sometimes it splits into bugs. Sometimes semi-sick and semi-healthy, the ear is shorter than the ear, the color is dark green, and the worm is shorter and rounder than the kin, so that the glume opens outwards, exposing the pods. Insects have hooks on the top, gutters on the side, initial oil green, yellowish-brown to dark brown later, old insects have a harder shell, containing white cotton floc nematodes, pod morphology and head smut The grains are the same, but the outer membrane of the smut is brittle and the black spores are inside.
The pathogen Anguina tritici (Steinbuch) Chitwood called wheatgrass nematode, a parasitic nematode. The male and female adults are less active and their contents are thicker, with an irregular membrane-like gut-like body, and oocytes and spermatocytes arranged axially. The females are hypertrophied and curled into strips. The heads and tails are more pointed and the size ranges from 3 to 50.1 to 0.5 (mm). The males are smaller and do not curl. The size is 1.9 to 2.50.07 to 0.1 (mm). Eggs are produced in green worms, scattered, long oval, size 73-14033-63 (μm), 1st instar larvae coiled in the eggshell, 2nd instar larvae needle-like, head obtuse, tail tip, tip Activities in the green cricket, and later in the brown worm dormant.
Transmission routes and onset conditions Granule nematodes are spread in wheat grains with insects. Insect mites were sown in soil with wheat seeds and recovered from dormancy after the 2nd instar larvae recovered. As soon as the wheat germinates, the larvae invade the growing point near the growing point along the buds and invade the outside of the campsite, causing damage to the stem and leaf original body, resulting in curly deformities after the stems and leaves, and invading the flower buds during the differentiation of the young spikes, infesting the camp, and flowering Period of damage to stimulate ovary distortion, become a prostitute. During the filling period, the green larvae of the green worms developed rapidly and then licked for 3 times. After 3-4 years of age, they became adults, and 7-25 worms were found in each worm. After mating, males and females spawned, and hatched larvae were damaged in the green insects, and the insects became brown and nearly round. The 2nd instar larvae are dormant. There are 8,000-25,000 larvae in one worm. In dry climates, larvae can survive for 1-2 years. The nematode is a vector infecting wheat by pathogenic bacteria (Corynebacterium tritici). In addition to infesting wheat, the nematode also infects rye, barley and oats. The severity of the disease and the amount of mixed worms in the material and the soil temperature after sowing. Soil temperature 12-16 °C, suitable for nematode activity damage. Sandy soil conditions are heavy and the incidence of clay is light.
Control methods (1) Strengthen inspections to prevent the spread of insects with pests from a distance. (2) Establish a disease-free seed retention system Establish a disease-free seed field and plant reliable and disease-free seeds. (3) Remove the insects in the wheat seedlings. Select the seedlings in the water and pour them into the clean water. Stir quickly and remove the insects, but remove 95% of the insects. The entire operation strives to be completed within 10 minutes to prevent the insects from sinking. The salt water used 20% saline to remove the infestation from the water, but afterwards, wash the seeds with water. Ammonium sulfate liquid selection method with 26% ammonium sulfate solution can be washed. (4) Apply 3 years or more of rotation to prevent insects from mixing into manure, and apply adequately decomposed organic fertilizer. (5) Pharmaceutical treatment Seeds used 50% methyl parathion or methylisophos- phate, and 0.2% seed weight was mixed with stuffy seeds. 200kg of water per 20kg of seed is applied to 20kg of water. After mixing, it is heaped 50cm thick and boring for 4 hours. (6) 15% of aldicarb Granules for chemical control use are regulated at 237.5-100g per 667m or 10% glyphosate 200g and 3% Wanqiang granules 150g.
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