m******v
发帖数: 36 | 1 求教:黄瓜叶子上出现白色的斑点，有大有小，基本上是圆形的.
仔细找过了，没有发现任何虫子。该怎么处理？多谢多谢! | m******v
发帖数: 36 | | l*n
发帖数: 2590 | 3 是powdery mildew。
现在不是太严重，建议你上1%的Neem oil喷一下，不过不要在温度超过85度的天气里喷。
【在 m******v 的大作中提到】
: It looks like this one.
| m******v
发帖数: 36 | 4 Thanks a lot, will try Neem oil.
Another recipe from internet, will try this one too.
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Baking Soda (sodium bicarbonate) -This is possibly the best known of the
home-made, organic solutions for powdery mildew. Although studies indicate
that baking soda alone is not all that effective, when combined with
horticultural grade or dormant oil and liquid soap, efficacy is very good if
applied in the early stages or before an outbreak occurs.
Use this recipe to make your own solution—mix one tablespoon of baking soda
with a teaspoon of dormant oil and one teaspoon of insecticidal or liquid
soap (not detergent) to a gallon of water. Spray on plants every one to two
weeks.
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