Holes in leafs - do I have to worry?

[Powertotheflower]

I grow 4 plants on the terrace. first only one, but by now 3 of them have a few leafs with small holes. So far I don't think it really hurts the plants, but I'm afraid that more leafs will be damaged. haven't seen any bugs. Does anyone know what the holes come from and what I can do?

 

[Powertotheflower]

now I do worry. today I realized that most of the older leafs of one plant are changing their colour, getting little brown dots. The other 3 plants so far don't have that so far.
I don't think that it has to do with nutes. I'm using Biotaps with all the plants and they grow and doing fine.
Nobody here with an idea what this could be and what I could do?

 

[Bob's Auto's]

You have caterpillars brother...and they are now probably cocooning underneath them leaves somewhere...

 

[Powertotheflower]

Thank you for that reply. Any advice to get rid of them? Should I keep the infected plant away from the others?

 

[Powertotheflower]

just looked again. but I can't see anything under the leaves.

 

[GreenBean]

They can be pretty sneaky. But caterpillars and grasshoppers love outdoors canna. I will usually use BT, or Spinosad up until flower on outdoor grows.

 

[Bob's Auto's]

Spinosad, if you can get your hands on it. US is easy to get a good deal. In Europe not so, but pyrethrum is easier to get. Go figure

 

[JP1]

I've had good luck with this for caterpillars...

Monterey Bt Liquid Concentrate

OMRI Listed Monterey Bt Liquid Concentrate is a biological insecticide whose active ingredient is the beneficial bacteria Bacillus thuringiensis subspecies kurstaki strain SA-12 ( Btk ). This biopesticide works by introducing bacterial spores and toxins into the body of the insect...

www.arbico-organics.com

 

[Powertotheflower]

Thank you for your answers. I found something with BT, so will try to get that. But it seems that you have to be very carefully (lot of precautions mentioned when used), so I wonder if it's ok to use it with flowering plants as well. 2 plants will need probably another 5-6 weeks (about 3 weeks of flower), the 2 smaller ones 6-8 weeks (maybe 1-2 weeks of flower).

 

[JP1]

You can use Dr zymes eliminator and lost coast plant therapy up until harvest