The latest control methods of strawberry powdery mildew

Strawberry powdery mildew is a very common disease in strawberry production, which generally results in a 20% reduction in strawberry production by 30%, and may even cause a bad harvest, seriously affecting the planting efficiency of strawberries. So how to control strawberry powdery mildew? Let's learn more about it with the editor.

1. Occurrence of symptoms

Powdery mildew can occur in the whole growth period of strawberry, which mainly infringes on strawberry leaves, flowers and fruits. At the beginning of the damage, the leaves show dark spots of no size. With the passage of time, white powdery matter will be produced on the leaf spots, and the disease spots will turn reddish brown in the later stage. The leaf margin gradually shrunk and scorched. After the flower is infected, the petals may turn red, resulting in the bud can not be fully opened, the young fruit can not be normally expanded, withered and shrunk, a layer of white hair will appear after the fruit is infected, and the color will be uneven, which will seriously affect the fruit quality and edible value.

2. The cause of disease

Most of the pathogens use mycelium and conidia to complete the annual cycle of conidia in the previous generation of the host and spread by airflow, invade from the bud tube and haustorium, propagate rapidly, and form hyphae after a week, then form new conidia and spread by airflow. Under the premise of the existence of pathogens, the prevalence of the disease depends on temperature and humidity. In the range of 15-25 degrees, when the humidity is higher than 80%, the disease spreads faster, showing the characteristics of low temperature and high humidity. In addition, insufficient base fertilizer, lack of soil water, or too much watering, excessive application of nitrogen fertilizer, lack of light and so on are also conducive to the epidemic of the disease.

3. Prevention and control methods

Reasonable rotation can be adopted, which can reduce the number of pathogens and reduce the occurrence of diseases. Varieties resistant to powdery mildew should be selected when planting. When fertilizing, it is necessary to apply reasonable fertilizer, do not partial application of nitrogen fertilizer, watering follows the principle of "better dry than wet", do small water irrigation frequently, do not flood irrigation, and extend the ventilation time and humidity in the greenhouse as much as possible without affecting the normal growth of strawberries. When the disease occurs, the diseased plants should be pulled out in time and taken out of the field for treatment, and then the disease and its surroundings should be sprayed with acetaminophen to avoid further spread of the disease.

The above is the introduction of strawberry powdery mildew prevention and control methods, hope to help you, want to know more related knowledge, please pay attention to us.