I just came back in a few minutes ago from checking those two.
I got a little more curious about looking into what the cause was seeing as how other ppl were havin an identical problem.
Look closely at you plants. If there are more than one, check and compare them all.
I noticed when inspecting some leaves that had grown in prior to this whole ordeal, that there were slight signs of it before these holes appeared.
Of the two in the buckets, one didnt become affected nearly as bad as the other.( Ill call that plant #1) Coinsedentaly plant #1 was also a deeper more vivid green then its sister. Got me thinking...
When i looked at this healthier lookin plant #1, i noticed that at about the same point in growth that i got the holes in plant #2 there are teeny tiny light green-white spots clustered together like the tiny holes were.
Then i went back to the severely affected #2 girl and looked at the stuff that came prior to the holes on her.
Sure enough (though BARELY noticable) the couple sets of leaf sets that came in ahead of the riddled ones have those same teeny whitish/greenish flecks.
I dont know about what anyone else here would say, or for that matter what kind of nutrient deficiency would cause such a thing, but,
This was some kind of def. in my plants.
I questioned it once or twice and was back and forth over that and the bugs for a while.
Now after having looked so closely, comparing them, and having seen them come around from the foliar spray, im thoroughly convinced that there was somthing lacking in their diet.
Hope the input helps.