According to monitoring by the Beijing Crop Pests and Diseases Monitoring Network, it is expected that the overall incidence of wheat diseases and pests in Beijing in 2014 will be moderate. The wheat crickets are generally biased, and the midge of the worms will occur. The situation of prevention and control is more severe. In order to do a good job in this year's prevention and control of major wheat pests and diseases in the city, and ensure the harvest of wheat, the main pest control methods for wheat in the middle and later stages are described below. powdery mildew
Wheat booting and heading stage, when the diseased plant rate reaches 15%-30% or the diseased leaf rate reaches 8%-15%, 15% triadimefon WP 50g or 20% triadimefon emulsifiable concentrate 40g per mu can be used per mu, watered 10 kilograms are sprayed, and the disease can be controlled by controlling it once. Sheath blight
It can develop from the seedling stage to the jointing stage, and it mainly infects the stem base and leaf sheath. The bacterium nucleus or mycelium of the pathogen on the damaged plant residue or in the soil over the summer or winter, becoming the main source of bacteria for the initial infection. Usually two transmission peaks are formed in the field before the winter and in the jointing and booting stage. Physical control: selection of disease-resistant seed varieties, appropriate sowing. According to variety characteristics, soil strength, sowing date and other factors to determine a reasonable sowing amount, to prevent excessive seeding caused by excessive growth of wheat seedlings, to create conditions for the development of diseases; apply fertilizer, nitrogen fertilizer can not be over-application, and with phosphorus and potassium fertilizers, enhance plant resistance Disease power. Chemical control: Seed treatment. Use 2% triadimefon (triadimefon) wettable powder with seed weight of 0.1%-0.12% for seed dressing; field pesticide control at the end of tillering of wheat seedlings, 15% triadimefone WP per acre 100g, or 40% carbendazim Suspension 100 grams, 10 kilograms of water for spraying. aphid
The first thing to do is to check the pest situation. When the number of 100 strains in a wheat field exceeds 500, or when the ratio of natural enemy units to aphids is 1:100 or more, control is needed. Use 10% imidacloprid wettable powder per acre 20-30 grams + 80% dichlorvos EC 50 ml, or 10% imidacloprid wettable powder 20-30 grams + 4.5% beta cypermethrin EC 40-50 ml, 30 kg evenly spray. Midplasma
There are two key stages in the prevention of midge pests: First, the control of poisonous soil in the flood season reduces the number of larvae that become pupa. The second is the prevention and control of adult insects, which eliminates adult worms and reduces larvae damage. In the flood season, 200-300 ml of 40% phoxim EC can be controlled per acre, mixed with a proper amount of water and 25-30 kilograms of fine sand, spread evenly over the wheat ridge, and dropped as far as possible onto the surface. No precipitation should be properly watered. If you miss the flood control, you can treat it in the adult stage. You can use 10% imidacloprid WP 20g + 80% DDVP EC 50ml, or 4.5% cypermethrin EC 40-50ml + 80% DDVP EC 50ml, Mix 30 kg of uniform spray.
Scab
In the early stage of wheat flowering, 50 grams of 80% carbendazim micropowder or 100 grams of wettable powder is used per acre, and 10 kilograms of water is sprayed. If it rains continuously during flowering, it will be used again 7 days after the first application.
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