When is the filling period of wheat?

The flowering and filling period of wheat is the peak period of many diseases and insect pests, and it is also the key period for wheat to strive for grain number per spike and 1000-grain weight. The main control targets in this period were wheat midge, wheat aphid, wheat sheath blight, powdery mildew, stripe rust, scab and leaf blight. When controlling pests and diseases, different control techniques and formulas should be adopted according to the occurrence dynamics of pests and diseases in wheat fields, so as to achieve the effect of controlling more with one spray. Specific prevention and control opinions:

1, control wheat midge adults and wheat aphids. In the first half of May, wheat blooms and midges enter eclosion to lay eggs, which is the key period for adult control. At this stage, adults lay eggs in the upper part of wheat, and wheat aphids reproduce in the middle and lower leaves. At this time, scientific control of pesticides can achieve the effect of treating both the symptoms and the root causes. It is best to spray imidacloprid phoxim, such as 30% pesticide 1. You can also choose 4.5% beta-cypermethrin 1000 times solution or 10% imidacloprid 1000 times solution for spray control.

2. When it is necessary to treat sheath blight at the same time, 5% validamycin 100 ~ 150ml or 20% colistin 60 ~ 100ml can be mixed with the above chemicals, and the chemicals should be in place for the wheat stem base.

3. It rains during flowering, and powdery mildew, stripe rust or scab need to be treated. Add 12.5% diniconazole and 25% tebuconazole to the liquid medicine for controlling midges and aphids at the dilution multiple of 1500 ~ 2000 times, or add 20% triadimefon and 50% carbendazim at the dilution multiple of 1000 times for control.

Precautions: ① The amount of liquid medicine per mu should not be less than 30 kg, and the spraying should be even and thorough, so that all parts of wheat are covered with medicine, especially the lower leaves. Don't hesitate to use water. (2) The mixed drugs should be prepared as needed and should not be stored.

In addition, gramineous weeds should be uprooted in time. Because of malignant weeds such as Aegilops tauschii, oats, Aegilops tauschii and so on. They breed quickly, do great harm, and mature earlier than wheat. Their seeds fall off the surface with the continuous maturity, and most of them have basically landed when wheat matures, leaving hidden dangers for the coming year. Therefore, the wheat field with this malignant weed should be completely uprooted and taken out of the field before heading and filling, and eliminated before fruiting.