The control time of wheat scab is better in the early stage of infection

Wheat scab is most likely to occur at heading and flowering stage, that is, from mid-April to mid-May, so the control effect is better at this stage. Wheat scab should be mainly prevented. If it is infected at flowering stage, serious consequences may occur at grain filling stage, and it is difficult to prevent the disease at this time.

1. Control time of wheat scab

Wheat scab, also known as wheat ear blight, can lead to the occurrence of rotten ears, and even cause wheat death. Wheat scab generally occurs at heading and flowering stage, and the time is generally between April 15 and May 10. Because of the climate difference and slightly different time, wheat heading stage and flowering time should be carefully controlled.

Because wheat scab is infected at flowering stage, serious consequences occur at filling stage, and it is difficult to control after disease occurs, so prevention is the main method for wheat scab. And wheat scab prevails in cloudy and rainy weather commonly, control wheat scab so, must seize crucial period.

II. Control methods of wheat scab

1. In order to control wheat scab, seed dressing can be carried out with yield-increasing bacteria, and then sown after drying.

2. Prevention of ear rot at flowering stage is the key point of prevention and control. Pesticide spraying should be carried out at the early flowering stage, especially at the heading and flowering stage. When the weather forecast has 3 consecutive days of rainy weather, it is more necessary to be vigilant and apply pesticide in time 6-24 hours before rainfall. If it is not possible to administer the drug before rain, it can also be administered within one day (at the latest 36 hours) after the rain stops or during intermittent periods. Generally, according to the characteristics of climate, variety and growth period, the second application is carried out every week or so.

III. Precautions for wheat scab control

1. Selection of pesticides

(1) To prevent and control scab, pay attention to the selection of pesticides with good permeability and persistence, and the pesticides should be resistant to rain erosion. Generally, 10% Cisco 50g or 50% carbendazim 75g mixed with 20- 30kg of water should be used per mu for spraying.

(2) the use of ultra-fine powder or glue effect is better, should be aimed at the wheat ear when using, and pay attention to the pressure and spray aperture, spray film should use small hole spray film, to ensure that the mist meets the requirements.

(3) Note that the water consumption per mu should be greater than or equal to 15 kg, and the use concentration should be calculated correctly.

2. Watering time

Watering time should be arranged flexibly to avoid sprinkler watering. Generally speaking, watering should avoid flowering period.

3. Mixed use of pesticides

In heading and flowering stage, it is generally also the time to prevent powdery mildew and other diseases and insect pests. At this time, some pesticides can be mixed to realize the effect of spraying pesticides once to prevent various diseases. Pay attention to the concentration of pesticides.

4. Mistakes in disease prevention

(1) The control of wheat scab cannot always rely on old experience, but should be considered comprehensively according to climate, soil and wheat ear.

(2) The disease should not be treated with drugs, but prevention should be the main one.

(3) Strictly control the frequency of medication, and the amount of water should be sufficient.

(4) Pay attention to the correct mixture of different pesticides to prevent the occurrence of diseases in an all-round way.