Oil plus heat

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To applying pesticide when it's very hot or plants are dry.

Oil plus heat is great for saute but not a good thing for roses or tomatoes.

The rose foliage burned after a misty spray of liquid lawn weed and feed went a bit wide. The tomato reacted to spray that drifted as a neighbor killed weeds. Both may recover but their season will be lost.

 

Discoloration and distorted growth often follow exposure to pesticides during hot weather. Herbicide and fertilizer caused this damage on the exposed surfaces of a hybrid tea rose. Oil is the base in most spray formulas, so even insecticides that are normally considered safe for use on a plant can burn when they sit on the plant leaf like coconut oil on a sun bather.

Discoloration and distorted growth often follow exposure to pesticides during hot weather. Herbicide and fertilizer caused this damage on the exposed surfaces of a hybrid tea rose. Oil is the base in most spray formulas, so even insecticides that are normally considered safe for use on a plant can burn when they sit on the plant leaf like coconut oil on a sun bather.