Wheat heading and flowering period is the key period for the formation of wheat yield, and it is also the key node for controlling wheat pests and diseases. At this stage of wheat, the glumes are opened and the germs easily infect wheat ears. If it is raining during the wheat flowering period, we must beware of these pests.
First, wheat scab
Since there are a large number of germs every year, heading to the grain filling stage of wheat, it is prone to scab in case of rain.
Once wheat is infected with head blight, it generally reduces production by more than 10%. In severe years, it can reduce production by 20-30%. Furthermore, the toxins contained in wheat grains can cause poisoning or miscarriage to humans and animals, which is extremely damaging!
In order to protect the interests of farmers and prevent “gravy injury to farmersâ€, in 2017 the country will continue to implement the minimum purchase price policy in the main wheat producing areas. With the approval of the State Council, the minimum purchase price for wheat (third class) produced in 2017 is 2.36/kg, which remains unchanged in 2016.
However, whether or not it can sell 2.36 yuan/kg in the grain storage sector depends on whether the quality of wheat is up to standard. Therefore, prevention and control of wheat scab and reduction of gibberellin are key.
In addition, the number of wheat diseased grains exceeds 3% (4% in previous years), and purchases are prohibited from being put into storage, which is an increase of 1 percentage point from the standard in previous years.
Remind the majority of wheat farmers, Yang Hua must pay attention to the control of scab.
Wheat scab control:
In the prevention and control of wheat scab, it is necessary to pay attention to the complement of the agent's resistance and the mechanism of action. For example, in some places, if carbendazim is used to prevent and control wheat scab in the long term and the effect of the drug on drug resistance is very unsatisfactory, it is necessary to increase the dosage or replace other fungicides. Such as tebuconazole, prochloraz, cyanocastrobin and so on.
At the same time pay attention to the correct use of different mechanisms of action of the agents, mixed medication or alternate medication, to ensure that the use of the drug has a multiple effect of internal absorption therapy, protection eradication, to prevent the spread of the disease.
If it has rained and the wheat is dry for about a day, the threat of head blight is not great. It is advisable to spray the drug to prevent scab as long as it can be used to fight drugs.
Second, wheat powdery mildew
Continuous rainfall will not only lead to head blight, powdery mildew will also go out in the water, prochloraz, triadimefon, diniconazole, propiconazole, and carbendazim, all can prevent powdery mildew.
At the heading and flowering stage of wheat, in the late stage of wheat powdery mildew, 15% triadimefon WP 80-100g/mu, 30% thioxamate suspension 400ml/mu, 25% prochloraz EC 50-60ml/mu , 6% tebuconazole microemulsion 200ml / acre, 12.5% ​​of myclobutanil emulsifiable concentrate 3000 ~ 5000 times the liquid spray, spaced 7 days before spraying again.
Third, wheat rust
High temperature and humidity are conducive to the occurrence of wheat rust. It is reported that due to the recent favorable weather conditions and other factors, wheat stripe rust rapidly spreads in the Huang-Huai-Hai wheat area. Widespread occurrence, rapid spread of the epidemic, reports of wheat stripe rust in Henan, Shandong, Shaanxi, Anhui, Jiangsu, Shanxi, and Hebei.
The main characteristics of wheat stripe rust: it mainly occurs in 2-3 leaves below the panicle, followed by leaf sheaths and stems. On the front of the leaf blade, there appears a bright yellow long stripe that is parallel to the veins and arranged in rows. Like a rust-like pattern, it appears as a dotted line, like a stitch rolled by a sewing machine. â€
In the next 10 days, rainfall in North China, Huanghuai, and other places, combined with pouring grouting water everywhere, increasing the humidity in the field will be conducive to the spread of wheat stripe rust.
Control methods: 12.5% ​​diniconazole WP per acre 30-50 grams or 430 grams per liter tebuconazole suspension 10-20 ml / acre or 25% propiconazole EC 30-40 ml / acre water 30 - Uniform spray of 50 kg, severe onset of land mass, spraying again every 7 days. We must rely on specialized and unified defense service organizations to prevent and control and ensure the effectiveness of prevention and control.
Four, locusts
Heading flowering period also pay attention to guard against the damage of locusts. To know that wheat blooms, locusts are also prone to flooding.
Control methods: Mu with 10% imidacloprid wettable powder 20 grams, 50% anti-inferior wettable powder 10-15 grams or 25% pymetrozine wettable powder 20 grams, watered 30 kilograms, in the morning dew dry or afternoon Spray evenly after 4 o'clock. If you add 25% tebuconazole EC 50ml or 12.5% ​​diniconazole WP 50g simultaneously, it can be used to treat diseases such as scab, powdery mildew, leaf blight, leaf rust and other late-stage wheat diseases. effect.
Remind Meinong once again that in early May, regardless of whether the wheat is growing or there are no flowers, it is necessary to use drugs to control scab before continuing rainfall.
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