I know very little about grapes other than the wild one which grows here on my property (and we eat them). But, for me, I've got a bad case of Powdery Mildew over here in Rhode Island, on multiple types of plants. Worst hit are some of my DR apple tress which are supposedly very resistant to PM. *sigh* I already gave them a sulfur treatment earlier in the season, but I'm not sure how much it helped. I thought sulfur was more of a protectant rather than an irradicant? Anyway, I decided to get tough and order systemic Immunox to see how that will work. I had wanted to experiment with Immunox anyway to see how it compared against Ferbam for Cedar Apple Rust next year. I had to order it online, as I couldnÂt find it at my 7 local nurseries. DonÂt be confused with "Immunox Plus" which is more widely available, but also has an insecticide which isnÂt rated for fruit. According to this link, it's very effective against PM for my apples: http://www.caf.wvu.edu/kearneysville/vadisbul.pdf According to this pesticide page, it is rated for grapes as a foliar treatment So, IÂm not sure what it means when you already have grapes: http://www.pesticideinfo.org/Detail_Product.jsp?REG_NR=00968800123&DIST_NR=008845 According to this link, others are using it for grapes, and itÂs among their last seasonal sprays: http://www.jackeden.com/cgi-bin/sheets/viewdata.cgi?id=1144209836 HereÂs the product homepage: http://www.spectracide.com/ProductCategories/RoseAndFlowerCare/SpectracideImmunox/ Note: I only ordered this yesterday, so I don't yet know the results of how effective it will be for me. Again, to quote another poster, I know very little, but I did stay at a Holiday Inn Express last night. Please double check all my info before acting on it. Other thoughts/opinions are welcome. -Glenn

I have had some experience with T&M and have to agree with many of the comments posted. I first came across the company many years ago and observed a significant change in practice as time went by, in particular I noted the vastly increased "hype" associated with their products (does anyone remember the edible carp for sale!); this I attributed to their increased focus on the U.S.A. market  in particular the usage of what I would refer to as "Americanisms", in the catalogue descriptions. I see from comments posted here that you guys have now got your own! As a customer of their seeds I was once invited to promotional event that they had organized in conjunction with a garden centre in a neighboring county. Whilst there I saw some fantastic gerberas on display, I asked one of their reps about where I could acquire seeds of these plants, and was somewhat sheepishly told that these where vegetatively propagated clones that where not available and were only for purposes of display! Partly as a result of this experience - in which I felt that T&M had been lest than honest - I took my custom elsewhere. I have also observed that the T&M marketing drive extends to U.K. gardening magazines aimed at the amateur, there being frequent mentions of this company in various articles and presentations sometimes "ad nauseum", which implies to me that some product placement deal is in operation. I would suggest that potential customers view the claims and additional hype that T&M generate "cum grano salis", and to make full use of sites like this and also the internet in general when sourcing seeds and plant material.

Spray with a Bordeaux mix, such as Bonide Copper Fungicide. You'll never rid the plant of it, but it will bring it under control and you won't lose the plant. You should get on a regular routine of spraying them both with it before the rains of spring in your area arrive. edit: I posted this link for another grape vine problem, but it's such a nice file (loaded with photos & info) that I'll post it here too: http://www5.agr.gc.ca/resources/prod/doc/sci/pub/pdf/id_guide_major_diseases_grapes_e.pdf This post was edited by MsMorningSong on Fri, Jun 13, 14 at 13:49

Throw the Thompson's in the trash can. It can do nothing for you but cause premature failure as the products are not compatable. I am also not a fan of putting bleach on untreated wood. You would get much better results using sodium percarbonate to clean your deck.