I found your website by googleing and I have read the info on leaf cutter bees. Still need to ask questions though. This is the second year that we have become aware of this problem, so much so that we have been so disappointed with our roses. Now that we are going into the fall and freezing will be coming on here in NW Nebraska, I'm wondering what, if anything, we should be doing now???? I even had some product intended for barnyard that had the product in that you sell(pyretherine?) and it really did a bad number on the plants(could be, I sprayed it wrong time of day). Could you please advise me as to your recommendations? Thank you kindly.
In our LEAF CUTTER BEE CONTROL ARTICLE, we have both PERMETHRIN CONCENTRATE and PERMETHRIN DUST featured. These products can be sprayed directly on your roses and will not damage them if you do the treatment in the evening after dinner. As a general rule, you should never spray any plants in the middle of the day when it's hot outside. Early morning treatments are okay; evening treatments are the best.
Since leaf cutter bees are generally thought of as "beneficial", you might consider repelling them and not killing them. To do this, use the INSECT REPELLENT CONCENTRATE instead of the Permethrin. This product is completely organic and won't hurt any insects; it's merely a repellent and will keep away pests where applied. Just mix it with water and do your spraying in the evening to avoid heat damage.
Here are direct links to the information and products listed above:
Leaf Cutter Bee Article: http://www.bugspray.com/catalog/products/page1344.html
Permethrin Concetrate: http://www.bugspray.com/catalog/products/page1344.html
Permethrin Dust: http://www.bugspray.com/catalog/products/page1348.html
Insect Repellent Concentrate: http://www.non-toxic-pest-control.com/repellents/nbs-repellent-insect-spray