White spots appear on the leaves of zucchini. White spots do not necessarily appear as powdery mildew, because this “white†is not a layer of mildew, but a white spot, much like the symptoms of silver leaf disease. How then does silver leaf disease and powdery mildew identify and What about prevention?
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Zucchini silver leaf disease is caused by plants infected with silver leaf disease virus. At present, the cause of silver leaf symptoms is recognized as the result of the damage caused by B-type whiteflies. Its saliva secretions are toxic to plants and have internal absorption. Sexuality, that is, insects do not necessarily have symptoms, but later on the new leaves show silver leaves. There is no whitefly on the silver leaf disease plant, which is the key to the cause of silver leaf disease for a long time. Therefore, only the complete eradication of Bemisia tabaci to prevent its spread, can control the damage of silver leaf disease.
Zucchini powdery mildew is a fungal disease that can be diseased from the seedling stage to the harvesting stage. The incidence of heavy leaves, petiole and stems followed. Zucchini powdery mildew can be pathogenic at 10-25°C. High-temperature drying is conducive to the expansion of the disease, especially when high-temperature drought and high-humidity conditions occur alternately, and when there are a large number of diseased bodies and susceptible hosts of powdery mildew, it is popular.
the difference:
The typical symptom of silver squash of zucchini is the generation of snowflake-like white spots near the leaf veins of the leaves. In severe cases, the entire leaves turn white, showing the appearance of bright veins and no mildew layer. This condition is due to unfavorable environmental conditions and damage caused by B. tabaci, resulting in chlorophyll synthesis disorders and the formation of silver leaf. When the population density of high temperature, drought and Bemisia tabaci is high, the disease will occur in a large area.
Zucchini powdery mildew can occur from the seedling stage to the harvesting stage. The incidence of blade disease is heavy. The petiole and stem are secondary, and the fruit is generally not affected. In the early stage of disease, small white spots with white near-circle were formed on the leaves or the leaves and young stems. There were many frontal surfaces of the leaves, and the entire severe leaves were covered with white powder.
Same thing:
Both of these diseases can severely hinder photosynthesis, cause premature leaf failure, and reduce the yield and quality of squash.
Control methods:
First, when the greenhouse membrane is used, it is better to use a drip-free membrane with good quality to reduce the relative humidity in the greenhouse. II. Prevention and control of silver squash of zucchini The most important thing is to prevent the spread of whiteflies. At the same time, it is supplemented by physical prevention and control to control the humidity in the shed, release the air early, and discharge the moisture in the shed. Appropriate amounts of trace element fertilizers and plant growth regulators such as the No. 1 harvest, etc., can make plants robust and reduce the occurrence of silver leaf disease. In the hot season, pay attention to shade nets and insect nets, pay attention to cooling and reduce the population density. Third, the prevention and treatment of powdery mildew in summer squash should be: 1, timely removal of diseased leaves and leaves in the field, enhance the ventilation and light transmittance in the field. 2. Strictly control the watering, control the humidity in the field, and reduce the incidence of disease. 3. When diseased leaves appear at the initial stage, it can be sprayed with 1500 times solution of World High or 2000 times Prelic for drug control. 
Difference between silver leaf disease and powdery mildew in zucchini