Horticultural oil maximum temps?

General Fruit Growing
#1

Hello, I planned to spray hort oil and fungicide today. My apples are at half-inch green to tight cluster.
I am in zone 6a Michigan. It is going to be 80 degrees out today and tomorrow. Is it too hot to spray?
Thanks

#2

Perfect. Has to be into the 90’s to cause damage. Doesn’t the label say? Having just read my Purespray label I guess it doesn’t. It isn’t about a precise temp, damage can be the result of water stress in the trees or high humidity combined with temps. https://extension.tennessee.edu/mtnpi/Documents/handouts/Insect%20and%20Disease%20Control/Horticultural_Oil_Handout.pdf

1 Like
#3

Thanks very much for the help Alan. My label does not say maximum temp.
Hope you have a great day.

#4

Thanks. I’ll spray to.