Yellow leaves,brown holes...yikes!

[otis48]

I have some plants growing outside in the 90 degree heat.
I`m feeding them GH maxi-gro every 10 days or so..I water them often.
I can`t see any sign on insects with my handheld microscope.

 

[NuttyProfessor]

i would say nutes too strong , first sign goes to tips , those holes look like bugs , i had them also takes a bit of time to see the little buggers have to look under leaves they are so small and green mostly , dont over water either let them dry to at least 4" down then give a good flush with good ph water ( check your ph too ) , looking at some of your hanging leaves signs of over watering which can lead to the bad leaves , learning my self still but have read up on every thing over the last 6 months lol
Im sure you will get few different answers but you should get the right one by one of the masters

Good luck

 

[Antics]

Looks like a 5 gallon bucket? Shouldn't have to water any more than once every 5 days or so with a fairly standard soil mix with perlite.

You want to let that soil get DRY. It should be completely dry on top with ZERO detectable moisture, and the moisture content in the soil should be fairly low before watering again.