The wheat ear stage is the main period for the occurrence of a variety of pests and diseases, and it is also a critical period for prevention and control. At this time, the species of pests and diseases mainly include leaf blight, rust, powdery mildew and scab; the species of insect pests mainly include the larvae, armyworms, ear mites, and wheat leaf bees. To control pests and diseases at the ear of wheat, it is necessary to take the prevention and treatment of pesticides as the mainstay, strictly follow the control indicators, select the pesticides on the road, and minimize the frequency of application; also pay attention to the protection and utilization of natural enemies to exert their control effects, and strive to control the hazards of major pests and diseases. Below the allowable level of economic loss, ensure a bumper harvest.
First, the prevention and control indicators and the appropriate period of prevention and treatment.
Wheat powdery mildew: the prevalence rate is 10%; leaf rust: diseased leaf rate is 5-10%; stem rust: sick stalk rate 1-5%; scab is sprayed at the beginning of wheat.
Wheat larvae: hand plucked wheat ridges, one can see 2-3 adult worms take off; sorghum: 500 stalks of stalks; armyworms: 15 larvae of 3 years old per square meter; wheat leaf bees: per square The rice larva has 60 heads.
Second, prevention measures
To control wheat powdery mildew and rust, use 50% of 20% of rusting emulsifiable concentrate per acre, or 15g of 15% of rusting WP, and spray 50-70 kilograms of water. Control wheat scab, spray 40 grams of water with 60 grams of carbendazim suspension per acre. Wheat leaf blight can be combined with prevention and treatment of other diseases.
Control wheat straw larvae, use 20% lindane wettable powder 20g per acre, or 5% chlorpyrifos EC 30-40ml; control sorghum, use 10% imidacloprid WP 10g per acre, or 5% anti-èšœWettable powder 8-10 grams; control of armyworms, 20% per mu, with 10% of the insecticidal suspension. The above agents are all sprayed with 50-70 kg of water.
When several pests and diseases in the wheat field occur at the same time, several pesticides can be mixed and applied according to the required dosage to reduce the number of times of administration. When applying the drug, adding 0.2% potassium dihydrogen phosphate or 1% urea according to the amount of liquid can increase the weight of 1000 grains, increase the yield of wheat, and achieve a bumper harvest of wheat.
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