I have used Root Shield 3 seasons...mixed into the seed starting mix for melons and tomatoes. The reason I use it is that I have raised melons for many years and it is hard to keep fusarium wilt down to decent levels in some years...without aids like T-22. I have used the left over supply as a booster drench later...need to learn better when to do this as melon roots really grow.
I've used T-22 on difficult Alocasia plants like A. nebula 'Imperialis' and others. I find that applying every one to two weeks works for these plants. I haven't grown melons, though, but if the roots grow fast, I would guess you need to apply the T-22 more often.