Hi mountainrose: I don't know about that product. However, there are cheaper ways to prevent BS and RRD, which I mentioned in the below thread.

The below thread deals mainly with BS, with just a touch on RRD. Michaelg's thread more than a week ago dealt more with RRD.

Here is a link that might be useful: Previous thread on BS

There are NOT cheaper ways to prevent RRD. There is NO proven way to prevent RRD, because of the size of the vector mites and their huge numbers when a garden may be surrounded by other roses infected with RRD.

Take a look at my e-book, and the bibliography it has in one of the last chapters.

RRD is far more complicated than a simple fungal disease.

Here is a link that might be useful: Rose Rosette E-book

It's possible that a spray could repel mites or make them fail to recognize a rose as an appropriate host plant. But as far as I know, we haven't a clue as to what that might be.

The reason I asked about rrd was that pro-tekt claims to strengthen cell walls. I wondered if it could strengthen the cells enough that the little buggers could not sink their fangs in.

Silicon compounds have been mentioned as something that one could try for RRvirus.

http://forums2.gardenweb.com/forums/load/roses/msg030010308429.html

I posted the following in a different thread:
"Something suggested (but not backed by controlled tesearch) is to spray the neighboring, so far not infected roses, with something like WiltPruff. The "hope" is that the "foreign" coating will "fool" the mites to look elsewhere.

Another untested "suggestion" is to add a silicon solution to your watering. In another thread I state: "I wonder if adding a silicate to the rose's water will "encourage" the rose rosette virus carrying mites to go elsewhere.
"The most widely accepted mechanism for the action of silicon in increasing plant resistance to insect attack is reduced digestibility and increased hardness and abrasiveness of plant tissues due to silica deposition, mainly as opaline phytoliths, in various tissues, including ... "

Here is a link that might be useful: earlier silicon thread

Seems like a good topic for research. Without controlled studies, rhere is no way for gardeners to tell whether something like that is working or not.

The following was stated: "Seems like a good topic for research. Without controlled studies, rhere is no way for gardeners to tell whether something like that is working or not."

H.Kuska comment. However since there has been controlled research on other benefits and the chemicals discussed in the other thread are not expensive, I would recommend trying if you consider the other benefits worth the cost and effort.

The link leads to a 2013 review in a major scientific journal. The abstract is not very useful to rose growers except to indicate that this concept has made its way to main stream science.

http://jxb.oxfordjournals.org/content/64/5/1281.abstract

Here is a link that might be useful: link to 2013 review abstract

Another 2013 review

http://link.springer.com/chapter/10.1007/978-81-322-0723-8_7#

"Title: Disguising the Leaf Surface

Abstract
The leaf surface provides the first barrier that fungi must overcome in order to gain access to the leaf, but it also provides chemical and physical cues that are necessary for the development of infection structures for many fungal pathogens. Film-forming polymers can coat the leaf surface, acting not just as an extra barrier to infection but also disguising the cues necessary for germling development. Kaolin particle films can envelop the leaf in a hydrophobic particle film barrier that prevents spores or water from directly contacting the leaf surface and, as a result, can suppress infection. Adhesion of fungal spores to the leaf surface, which is important to keep spores on the leaf surface and for appropriate development of the fungus on the leaf surface, can be inhibited, leading to reduced infection and lesion development. Polymer and particle films have been shown to provide disease control in the field, whilst research on agents that inhibit spore adhesion on leaf surfaces is still in its infancy. There is an urgent need for research on the practicality of using these novel methods under field conditions and on ways of integrating them into current crop protection programmes.
"

Here is a link that might be useful: link for 2013 review