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Old 08-01-2010, 12:42 AM   #1
fahne23
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Sep 2008
Pasadena, CA
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2nd year growth of Cascade and Nugget hops. This year has been plagued by some mysterious "powdery/cottony" looking stuff on the underside of the leaves. I have searched around everywhere and can't seem to find anything that looks similar to this.

Anyone able to shed some light? Any help would be appreciated!

Cheers!

http://img412.imageshack.us/f/hop1x.jpg/
http://img267.imageshack.us/f/hop2.jpg/

 
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Old 08-01-2010, 01:12 AM   #2
B-Hoppy
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it doesn't look like powdery mildew as there is some kind of webbing creating the white appearance. it actually doesn't look like any of the mite webbing i've ever seen. i'd take a magnifying glass and see if you can locate any critters moving around. my guess is that it's some other type of insect as there is none of the characteristic 'bronzing' of the leaves from mite damage

 
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Old 08-02-2010, 05:03 PM   #3
HoppyDaze
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its definitely not mildew...

the spider mites I have don't make such big and thick webs like that, but my money would be on spider mites...
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Old 08-02-2010, 05:12 PM   #4
fahne23
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Sep 2008
Pasadena, CA
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It definitely looks as though there are some critters moving around, however they look more like little flies rather than spiders...very strange.

 
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Old 08-02-2010, 07:48 PM   #5
Emerald
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Sep 2009
Michigan
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It looks more like a problem called White Fly- they can be taken care of with a teaspoon of dish soap in about a pint of water and spray them. Shouldn't hurt the hops.

 
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Old 08-03-2010, 02:09 AM   #6
ctheis
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Mar 2010
Tennessee
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It is neither Spider mite nor Powdery mildew... not sure what it is but looks like catterpillar nests of sorts.

 
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Old 08-07-2010, 12:16 AM   #7
Hopfarmer
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Jan 2009
Paonia Co
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I think this is your pest Eastern Comma Butterfly http://edis.ifas.ufl.edu/in817 Cheers Glen

 
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