1.Place：Kazuo County, Chaoyang, Liaoning
3. Test crop: cucumber
4.Product name: HD-816
5.Test disease: Powdery mildew
（1）On March 16th, 2021, powdery mildew occurred in a 720 square meter cucumber greenhouse, which was the initial stage. Dissolve 60 milliliters of HD-816 plant protection solution in 30 liters of water, stir well, and spray them with a 15-liter sprayer in two separate times. 430 square meters are used for medicine, and 290 square meters are not used for comparison.
(2) On March 23th, 2021, the powdery mildew of 430 square meters of cucumber was controlled for 7 days after the application of the pesticide. Observe that the parts where powdery mildew occurred on the cucumber leaf surface was dry, and the new leaves did not develop disease. In the other half of the cucumbers that were not sprayed with plant protection liquid, the area of powdery mildew was getting bigger and bigger.