Essie’s Corner (Dr. Esmaeil Fallahi, University of Idaho Parma Research Center)
Table Grape Research
Essie’s Update 4.23.11
Dear Grape Growers;
Late-Dorrnant stage is the best stage to spray table grapes and these days ,we are at that stage. This is the stage that buds are swelled but not opened. If you delay too long, you may injure the plant. In our spray program, we spray Dorrnant oil combined with Lorsban at this stage (follow rates and labels). Please be aware that in some oil formulations, mixing oil and sulfur sprays at the same time are not recommended. They recommend spray 10 days after oil spray. Since every formulation is different, I strongly recommend that you Follow the Label Before Using and Mixing any chemical. Please look at the following precaution from the Superior Oil NW. label as an example.
“USE PRECAUTIONS To avoid injury to trees, vines, fruit or foliage, observe the following precautions when using emulsiflable spray oils. WHEN USING SUPERIOR SPRAY OIL N.W. AS A TANK MIX WITH OTHER PRODUCTS, FOLLOW ALL LIMITATIONS, PRECAUTIONS AND RATE RECOMMENDATIONS WHICH APPEAR ON THE LABEL OF THE COMPANION PRODUCTS. D0 not Combine SUPERIOR SPRAY OIL N.W. with sulfur sprays.
For Grapes: Do not apply sulfur within 10 days of an oil application. For all other crops, do not apply micronized sulfur within 10 days of an oil application and do not apply oil within 14 days of an application of wettable or dusting sulfur.”
Dr. Esmaeíl “Essie” Fallahí
Professor and Director of Pomology Program University of Idaho, 29603 U of I Lane
Parma, Idaho 83660, U.S.A.
Tel: 208-722-6701 ext 225; Cell: 208-880-8088