Fungus gnats?

First thing to do is check the soil and underside of the leaves. That's where you find most pests.

 

Fungus Gnats, Bradysia and Sciara
Hosts: In potting soils and mixes of many houseplants. Symptoms: Damage is caused by the larvae. They feed on any organic matter as well as attacking bulbs, roots and other fleshy organs. Delicate seedlings of many plant species can be killed with plants yellowing and often wilting rapidly before death. Look for the larvae, particularly in the upper inch of media in the container. Fungus gnats have been shown to transmit diseases economically serious to the greenhouse industry. The gnats (flying adults) can be a nuisance for homeowners even thought they do not cause damage to plants.

Not gnat damage.
Did it appear suddenly or are you just noticing flaws that might have been long present?
Plants are rarely perfect with irregular leafs and other flaws.
Inspect close and monitor.
BNW

 

Some of those look like a caterpillar (of some sort) chewed on them? Maybe some kind of aphid? Spider-mite IDK?

@BrassNwood , what all kinds of bugs would chew on Canna leaves like a caterpillar? Besides the obvious answer "A Caterpillar" LOL

 

You could try a Neem oil treatment and see if that works? There are many other organic pesticides out there but Neem is what I used on mine.

I had gnats bad with one of my grows one time and they were flying all over the place, so if your not seeing adults flying around, I doubt it's gnats. The adult gnats themselves won't chomp on the leaves but their larva are bad for the roots and just kills the plant through starvation.

What you have looks more like something munching on the leaves to me.

Just my opinion...

 

I don't think nicked leaves would look like that, that's not a clean cut flesh wound, that's been chewed on and sections missing just like a caterpillar would do to a sweetgum leaf.

BTW, Are you using scissors or sheers to prune your leaves?

Just to pass along some cool info I was taught about pruning, you should pinch the leaves your pruning off with your fingers and let the leaf stem just die and sluff off. I was told to never use scissors or sheers for removing leaves. Clean cuts can attract diseases because of the open air getting into the wound, while pinched off leaves are more of a closed wound because the leaf stem is crushed instead of being cut, so the remaining leaf stem just withers and dies off cleanly...Or at least that's what my guru mentor taught me anyway...Just thought I'd share.

 

Several will but large damage is most often Grasshoppers, large browns and small greens. At lest that is who I find with a mouthful of cannabis leafs outside.
Aphids leave tiny punch holes.

Leaf miners look like squiggles on the fingers.


Thrip
.

BNW

 

Ahh, yea...I kinda forgot about grasshoppers, they eat very much like caterpillars, but their quick and nimble, so they can quickly hide when you get to looking for them.

I've seen a variety of tiny small green grasshoppers that could easily be overlooked upon inspection. If those were brought into the house via other house plants, they could easily transfer on to your Cannabis plants, or so I'd think?

I've actually had grasshoppers go around to the back side of a stem on my tomato plants before when I was inspecting for bugs, so they are sneaky little shits that will actually hide from you when you disturb the plants.

Maybe that's it? IDK? Could be a possibility?

 

I guess now the issue is to figure out how to get rid of them, if indeed that's the problem? You could try looking for them and catching them by hand, but that would be like looking for a needle in a haystack.

And if you do have them, you don't even know how many are on your plants, could be one, or could be a few?

I would defiantly start combing over your plants and establish whether that's defiantly the issue or not. If you can locate one of those little shits, you'll know for sure that's the problem.

Maybe someone will know of a remedy for grasshoppers that's noninvasive to your plants?

 

I use lost coast for ipm and bt for catepillars

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