Powdery White Substance Causes Grapes to Shrivel

By

Catherine Michele

The white powder is a fungus called oïdium. Here is a natural remedy that should stop the fungus propagation : spray leaves and grapes with 0.5% sunflower oil emulsified in water.

By

that_hippie_chick

It looks sort of like what happened to my fig tree several years ago. The white spread to the bush itself and ended up killing it, we thought. A nurseryman told me later that it was Bordeaux fungus. It affects grapes, figs, some other things. I believe that Ortho makes a spray for Bordeaux fungus, just read some of the labels. Ask at a farm or nursery center what they have.

If spraying with liquid soap/water doesn't work you might consider that it isn't mildew.

By

kffrmw88

http://www.backyardgardener.com/tv/mildew.html or I make a spray with liquid soap in kitchen; 1 table spoon of soap to a quart spray bottle of water, from Dollar store. Use it at least once a week, re apply after rain, good luck.

By

Susanne

BTW, this is a picture of the "powdery white substance"