dormant oil for chestnuts, walnuts, apples, and grapes. - Ask Extension
i already applied a home made oil once, but with all the rain, I'm wondering if another application might be a good idea?
Knowledgebase
dormant oil for chestnuts, walnuts, apples, and grapes. #786911
Asked April 15, 2022, 11:34 AM EDT
i already applied a home made oil once, but with all the rain, I'm wondering if another application might be a good idea?
Ottawa County Michigan
Expert Response
Hello,
Thank you for contacting Ask Extension.
Could you tell me what ingredients are included in your home-made dormant oil and to what strength? Also, what insects are you trying to treat at this time?
The following link from Oregon State Extension addresses dormant oils for fruit trees and what ingredients should be used. It recommends 3 treatments - one in the late fall, one in January and the third in February. It also discusses what to do if you miss this timeline.
https://today.oregonstate.edu/news/get-leg-fruit-tree-problems-dormant-oils
I have also included information from MSU Extension and the University of Minnesota Extension about horticultural oils in general that you may find helpful. These articles address how to use horticultural oils when pests are present.
https://blog-yard-garden-news.extension.umn.edu/2020/06/horticulture-oils-use-and-safety.html
https://www.canr.msu.edu/news/how-to-control-invasive-pests-while-protecting-pollinators-and-other-beneficial-insects
If these articles don't answer your questions or if you have other questions, please contact us again.
Thank you for contacting Ask Extension.
Could you tell me what ingredients are included in your home-made dormant oil and to what strength? Also, what insects are you trying to treat at this time?
The following link from Oregon State Extension addresses dormant oils for fruit trees and what ingredients should be used. It recommends 3 treatments - one in the late fall, one in January and the third in February. It also discusses what to do if you miss this timeline.
https://today.oregonstate.edu/news/get-leg-fruit-tree-problems-dormant-oils
I have also included information from MSU Extension and the University of Minnesota Extension about horticultural oils in general that you may find helpful. These articles address how to use horticultural oils when pests are present.
https://blog-yard-garden-news.extension.umn.edu/2020/06/horticulture-oils-use-and-safety.html
https://www.canr.msu.edu/news/how-to-control-invasive-pests-while-protecting-pollinators-and-other-beneficial-insects
If these articles don't answer your questions or if you have other questions, please contact us again.
my dormant oil consists of 1c vegetable oil
2T dawn
1 Gal. water
A friend says he has gaull wasps, and they're also at Hager park. We checked mine, and there are none so far. I spray my apples, fruits, cherries, pecans, walnuts, grapes, and chestnuts, with Imidan, and captan mostly. I'm thinking even when I miss dormant spray, which is often, my first spray of Imidan must get the eggs. I worried about keeping wettable powder in my unheated barn, but it must be ok after 15 years!
Hello,
MSU Extension usually recommends only scientific, researched methods and products. However, many home remedies have proven to be effective. The following is from the University of California Extension:
Alternatively, you can try a homemade spray developed by scientists at Cornell University:
Mix two tablespoons of ultrafine canola oil and one tablespoon of baking soda in a gallon of water.
Since you mention the possible presence of insects in your area, keep in mind that horticultural oils don't have a residual effect and must be sprayed when insects are present. They are non-selective, which means they can kill beneficials and pollinators.
I believe that there are recommendations for the use of Captan or Imidan in the articles I sent you earlier.
The following is an article from MSU on gall wasps that you may find helpful.
https://www.canr.msu.edu/news/tree_galls_are_rarely_cause_for_concern
Please contact me again if I haven't answered your questions or if you need further information.
MSU Extension usually recommends only scientific, researched methods and products. However, many home remedies have proven to be effective. The following is from the University of California Extension:
Alternatively, you can try a homemade spray developed by scientists at Cornell University:
Mix two tablespoons of ultrafine canola oil and one tablespoon of baking soda in a gallon of water.
Since you mention the possible presence of insects in your area, keep in mind that horticultural oils don't have a residual effect and must be sprayed when insects are present. They are non-selective, which means they can kill beneficials and pollinators.
I believe that there are recommendations for the use of Captan or Imidan in the articles I sent you earlier.
The following is an article from MSU on gall wasps that you may find helpful.
https://www.canr.msu.edu/news/tree_galls_are_rarely_cause_for_concern
Please contact me again if I haven't answered your questions or if you need further information.
