Every spring, wheat should be carried out "one spray and multiple prevention". For what to squirt? Prevent what? However, most growers do not understand that they also follow when they see others spraying medicine. As for what diseases or insects are in our fields, and when the effect of pesticides is better, it is not clear. For this reason, I would like to talk to you about the problem of spraying multiple prevention, when to spray, what to spray, and what to prevent.
If you want to know what to spray, first understand the meaning of one spray and multiple defenses.
Wheat is one of the most important crops in the world and an important food crop in China. The implementation of wheat spray and multi-prevention technology can greatly reduce the harm of wheat diseases and insects, lodging, dry and hot wind, ensure and improve wheat yield and quality, and then ensure national food security. At the same time, it can also reduce the economic burden of wheat farmers and improve the efficiency of agricultural production.
As the name suggests, it is an agricultural production measure for wheat to prevent diseases, insects, weeds, falls, and dry and hot air. The main measure is through pesticide control, that is, during the critical period of wheat growth and development, a one-time spray of suitable pesticides for wheat pest control to meet the safety standards of storage.
The implementation time of wheat spray and multi-prevention technology is about 2003, which is a national mobilization in wheat planting to prevent and control pests and diseases, lodging, dry and hot wind, increase grain and weight of scientific and technological activities, the main purpose is to ensure wheat production and national food security. In order to achieve this goal, wheat fields should be sprayed with fungicides, insecticides, foliar fertilizers and growth regulators.
Spraying time, prevention and control objects and medication. The climatic conditions in the north and south are different, the south is early and the north is late, and the specific day to spray the pesticide must obey the command of the local agricultural department. The following is just a reminder of the time frame for your prevention and control work.
When spraying for the first time: wheat regreening and jointing February 15 March 15.
From the tillering stage to the jointing stage (March), wheat mainly targets red spiders and aphids; Prevention of sheath blight and rust.
Aphids, red spiders: fludimidamide, thiamethoxam, thiamethoxam, chlorofluorine, chlorofluoroprid, bifenthrin, avermectin, ethoxazole, spirodifenolate, etc.
Sheath blight, rust: tebuconazole, tebuconazole, prochloraz, pyrazole etherstrobin, difenoconazole, fluconazole, etc. can be used.
The second spraying time: April 15 and May 10 from booting to flowering of wheat. During this period, it mainly prevents powdery mildew, rust, sheath blight, scab, etc., and promotes wheat booting and robustness. It can be prevented by adding appropriate tebuconazole prochloraz. Focus on the prevention and control of wheat scab. Wheat scab is most likely to occur at the heading and flowering stage, that is, between mid-April and mid-May, so the control effect is generally better at this stage. Wheat scab should be prevented, if it is infected at the flowering stage, there may be serious consequences during the grain filling stage, and it is difficult to stop the disease at this time.
Scab control: When wheat has just begun to flower, it can be sprayed with pesticides for prevention and control. Sooner rather than later. You can choose: 25% prochloraz aqueous emulsion 50-70 ml per mu, or 25% cyanostrobin suspension 100-200 ml per mu, or 40% tebuconazole prochloraz suspension emulsion 20-30ml per mu, sprayed with water for prevention and control, sprayed once every 5-7 days, sprayed 2-3 times in a row.
The third spraying time: around May 15 during the wheat filling period. The two periods from booting to grain filling stage of wheat are mainly used to control insect pests, dry and hot wind, and uncontrolled scab to prevent its spread. Spike aphid, sapase worm: fluridine thiamethoxam or bifenthrin + thiamethoxam or acetamiprid, etc. Prevent the spread of gibberella leaf blight: 30% tebuconazole, pyrazole, 40% tebuconazole, prochloraz, etc.
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