Barley stripe disease

Symptoms occur in all barley cultivation areas. Barley can be damaged above the ground, mainly damage leaves and leaf sheaths. Seedlings infected, 1, 2 young leaves can be disease, but 4-5 leaves later occurred more. Primary pale yellow spots or short streaks followed by leaf growth and lesions gradually spread. In the parturition period, elongated veins with parallel veins are formed and the lesion turns from yellow to brown. At the time of heading and pulling, most of the lesions have a grass color in the middle, and the edges are brown; the black humidity grows out of the black moldy layer; that is, the pathogenic conidiophores and conidia. The diseased plant is dead or dwarf in advance, and it is unable to cause heading or bending deformity, and it cannot be hard or full.

The pathogen is Drechslera graminea (Rabenh.) Shoem. Helminthosporium gramineum Rabenh. The sexual state is Pyrenophora graminea (Rabenh.) Ito et Kurib. Conidiophores 3-5 clustered, base expanded, grey to brown, size 90-1807.5-12 (μm). On the pedicels terminal or lateral 1-4 conidia, straight or slightly curved, the base is usually slightly wider than the upper base, the basal cells are hemispherical, size 50-12514-22.5 (μm), with 1-7 septa, Smooth surface, umbilical width 3-6μm. Secondary conidial stems and conidia are more common and parasitic on barley.

Transmission routes and pathogenic conditions The pathogens live in seeds with dormant hyphae lurking and generally live for 5 years. After sowing, with the seed germination dormant mycelium began to sprout buds invade the young shoots, followed by plant growth into young leaves, reached the panicle after the destruction of the flag leaves to encapsulate the ear, resulting in heading or deformity. The low temperature and high humidity during sowing are conducive to the infection of pathogens. Early barley sowing in spring or winter barley sowing, the low temperature in the early growth period, the incidence of heavy humidity.

Control methods (1) Establish barley disease-free fields and breed disease-free seeds. Before sowing, select the seeds, select the seeds with full grain, strong vigor, and high germination rate. Seed will emerge quickly after sowing and reduce the chance of pathogen infection. (2) sowing seeds for 1-2 days, can increase the germination potential and germination rate, early emergence of seedlings. (3) Seed treatment 1 With 25% triadimefon, 0.15% of the seed weight (active ingredient) is excellent in seed dressing control effect, and 2% Rikenxi Seed Dressing Agent 10g can be mixed with 10 kg of wheat seed. 2 Seed soaking in 1% lime water for 48 hours has better control effect on barley stripe and promotes the germination and emergence of barley seeds, or uses barley Qing No. 3 20g, plus a small amount of water to make a paste, water 16kg, Soaked barley seeds 12kg soaked for 30 hours (20 °C) after soaking direct germination sowing. The drug has a control effect of 90% on the disease and scattered smut. 3 It can also be soaked with 5% ferrous sulfate solution for 6 hours, dried and sown. 4 to promote the use of Soaking Spirit EC (Jiangsu Taizhou Chemical Fertilizer Factory) per 2ml liquid, 800ml of water, sprayed in 10-11kg barley seeds, and then fully mixed evenly stuffing after 6-8 hours after sowing. Can also be used 2ml water 16-20kg leaching 10-13kg barley seeds 12-24 hours. 5 sowing time. The severity of barley striae is closely related to the temperature during autumn sowing. 5-10 °C soil temperature on the appropriate period of incidence, high temperature can be reduced before and after the spike combined control of barley scab spraying 0.5% dinitrate solution, per 667m2100-150L, ​​or 50% benomyl WP 1000-1500 times liquid 25% Benzoterone EC 800 times.

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