The wheat has entered the autumn sowing season, and the prevention and control of pests and diseases during the wheat planting period is the key to ensuring the complete and strong wheat seedlings. The thorough control of pests and diseases by wheat seed dressing is an important guarantee for ensuring high yields and stable production of wheat and seizing the harvest in the coming year.
The control of the sowing date in wheat sowing targets at the autumn sowing date can play a multiplier role in the control of wheat pests.
Wheat seed dressing main control objects:
The first is soil-borne diseases, mainly sheath blight, total erosion, and root rot. These pathogens can live for many years in the soil. The germs can be infested when seeds start to germinate after wheat is seeded;
The second is systemic diseases, including smut smut, scattered smut, and head smut. The germs invade the growing point from the seed germination, systematically infiltrate with the wheat plant growth, and show symptoms at the ear stage.
The third is the underground pests, which are mainly cockroaches, cockroaches and golden needles. They bite the roots and stems of wheat in autumn and return to green, resulting in the lack of seedlings. In particular, plots of land that was formerly cropped as corn, peanuts, sweet potatoes, etc., have abundant foodstuffs and are conducive to the occurrence and reproduction of underground pests, which are widespread and serious.
Chemical seed dressing method
Underground pests: Mixing seeds with wheat seeds and treating soil before sowing are the most effective measures for controlling underground pests in wheat. For the general area of ​​the underground pests, it can be controlled by chemical seed dressing. Can choose 50% phoxim seed dressing, according to the seed amount of 0.2% seed dressing, 48% chlorpyrifos can also be used according to the seed weight of 0.3% seed dressing, after mixing nausea 4 to 6 hours can be sown, can effectively control underground Pests. Ground pests in severe areas should be treated with soil treatment and seed dressing. Soil treatment can be applied to the ground with 2% to 2.5 kg of 3% phoxim granules per acre, and then turned into soil.
Diseases: The use of pesticide seed dressing can not only control wheat smut, but also effectively control the occurrence of winter wheat rust, total erosion, and powdery mildew, and reduce the amount of overwintering bacteria. In areas where smut, head smut, root rot, sheath blight, and total rot occur, 40% pentachloronitrobenzene can be used to dry mix (0.5 g/mu) for the weight of the wheat seed. , mix wheat about 8 kg). For the control of wheat smut, it is also possible to select 1 bag (10 ml) of tebuconazole (Liquix) suspension concentrate, add 0.4 to 0.5 kg of water, and apply 25 to 35 kg of seed dressing, or 2.5% of fluromyceil. Le Hour) Suspension concentrates are seeded with wheat seed at the recommended dose, which can be used to treat rust and powdery mildew in autumn. With 15% triadimefon wettable powder by seed weight of 0.2% seed dressing or 20% triadimefon EC 0.5 kg water 2.5 kg, mixed wheat seed 250 kg, can control powdery mildew, leaf rust. In areas where wheat is fully eroded, it is possible to use 12.5% ​​thifluzamide (full-etching) suspensions for seed treatment, which has a good control effect on wheat rot. Generally use net 1 bag (20 ml) for total eroding, 300 to 500 ml of water first, 10 to 12.5 kg of seed to mix, and mix for 6 to 12 hours after mixing. (It is beneficial for the Pharmacy to play and kill the pathogens of the seed) After soaking in the shade, sow. In wheat yellow dwarf disease and bushy dwarf disease areas, imidacloprid can be used to treat seeds, prevent and control insects, and control the occurrence of wheat yellow dwarf disease and bush dwarf disease.
In areas where a variety of diseases and pests are mixed, it is necessary to vigorously promote the application of a seed coating agent or a seed dressing agent combined with fungicides and insecticides for coating or seed treatment. All local areas should be based on the main types of pests and diseases, select the appropriate formulation of seed coating agents or seed dressings, the amount of which is generally compounded (mixed) agent in a single dose of active ingredients and used alone.
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