A friend of mine and his group will be attempting to summit Whitney via the MT as a dayhike on Aug 6. I've never done the MT that early, so don't know the answer to his question, which is: Should we be concerned enough with mosquitoes anywhere on the trail to warrant bringing bug repellent? Since my ventures on Whitney have always been late Aug - early-mid September, I've not personally had any problems with the little blood-suckers!
CaT