I have spot sprayed tall fescue with trimec (3way) in 90 degree weather.... the whole reason main reason programs are written to spot spray in summer heat is not to burn the lawn... it knot really how hot it is that burns the lawn, its how hot the chemical mixture is in the tank. So if you have a huge tank mixed on your truck blanket applicating in hot weather then the tank is heat up and "skunk" the tank. All that chemical is not bad and will burn grass. Heat increases chemical reactions and makes it too strong.... that is why I apply granular fertilizer and spot spray. I could go into this further but on my phone. Basically u are right and the JD guy is moron... don't trust any his advice, this should of been a no brainer for him.
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