First, McCain
It is mainly composed of wheat diterpenoids, wheat aphids, and tuberculosis. It is a mediator of the spread of dwarf virus disease and yellow dwarf virus disease.
1. Control indicators. The heading period is 100 to 800 heads, and when the ratio of wheat to natural enemies exceeds 200:1 (referring to more than 200 heads of wheat), it should be controlled.
2. Biological control. Matrine, chloramphenicol (spore content of 2 million/ml), and 50% nebulizer (anti-violence) spray were used. Give full play to the natural control effects of natural enemies such as ladybugs, syrphids, grasshoppers, cockroaches and spiders.
3. Chemical control. Suitable for early use of neonicotinoids (imidacloprid, thiamethoxam, pymetrozine, nitenpyram, clothianidin, etc.), or organophosphorus (phosphonates, etc.), or pyrethroids Benzostrobin, cyhalothrin, fenpropathrin, etc.). Note: Imidacloprid should be used early, that is, after the heading of wheat (before May 10th), the aphid has not yet reached the control index, but the spraying effect has been better when it has been widely distributed on the lower leaves, and it is later used in mass production. The performance is not good. It is best to mix and spray with low-toxic organophosphorus pesticides in a reasonable amount, which can maintain a 10-day drug efficacy period. It is better to use the above agents for compounding each other. Acetamiprid had no effect on the control of wheat aphids in the late period (after May 10), and it is not recommended to use it again.
Second, wheat spider
Our province mainly has wheat leg spiders and wheat spiders. Mai long-legged spiders like warm and dry, mostly distributed in the plains, hills, mountainous areas, arid wheat fields, drought-prone and rain-prone years are prone to disaster. Generally occurs in late high-temperature conditions. Maiyuan spiders are hiy and damp, afraid of high temperature and dryness, and they are mostly distributed in irrigated or low-lying, damp and cool corn fields. It usually happens in early days when the weather is cool.
1. Agricultural control. (1) After the wheat harvest, cultivating the earthworms to eliminate the summer eggs and reduce the mouth density of the autumn seedlings. (2) Irrigate the wheat at the same time and shake the wheat plant to effectively reduce the population of wheat spiders.
2. Chemical control. In the spotting period, quick-acting acaricides are mainly used, and can be used in combination with other types of acaricides. It can be controlled by avermectin, matrine, ethylcarbazole, acetylene, bufalin, acetylene decyl ester, pyrimidyl ester, fluorenone, fenpyridyl ester, etc. and the corresponding compound preparations spray. Quick effect. Chlorfenapyr, fenpropathrin, flumethrin, bifenthrin, etc. may also be used, but the potency is short. The avermectin and other medicaments are mixed and sprayed in half.
The climate is cool before and after the erection period. The wheat spiders are the main species. Before and after noon, the wheat spiders were sprayed at the height of their damage. In late wheat jointing, high-temperature weather is dominated by wheat long-legged spiders. Before 10 o'clock in the morning and after 4 o'clock in the afternoon, spraying should be avoided during the high-temperature period at noon. It is important to thoroughly penetrate the drug for the first time. It is better to add 1% urea.
In the above-mentioned key prevention and control links for each target pest and disease, the addition of sea-salt hormone (5% aminooligosaccharide) can achieve various effects such as efficiency increase, quality improvement, growth promotion, stress resistance, immunity, and safety, and it can increase The prevention and control of wheat scab.
A summary of practical technical guidance for wheat field pests and diseases
1. Symptomatic. Choose drugs for symptomatic --- scientific.
2. Timeliness. Grasp the indicators and choose the best time to use drugs. Such as early onset, egg hatching, etc., before and after flowering, before and after buds.
3. Security. Crops, products, environment, production processes, etc.
4. Effectiveness. The effect is good, the comprehensive benefit is high, the investment is less, the income is more, and the interests are not unilaterally pursued.
5. Economical. Easy to take, easy to use, easy to grasp (actual), strong operability, popular, suitable for large agriculture and large production, such as unified medication, appropriate early management.
6. Rationality. The use of time (mainly in accordance with phenology), the correct scope of application, the practical use of mixing technology.
7. Placement. The application of technology, such as roots, bases, and leaves, is in place.
8. Uniformity. Evenly sprayed thoroughly, not heavy, the next turn on the buckle, spray uniform penetration, atomization is better, the application of new types of medical equipment.
9. Alternating sex. Not single drug use, reasonable alternate rotation and mixed use, improve drug efficacy, extend the life span of scientific and technological achievements, control the speed of target pest resistance.
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