It’s literally in the post. Not even in the article, it’s in the synopsis. Why didn’t you read that before commenting?
Can you be more precise? When you say “it” is “literally in the post” what exactly is “it”? Serious question because yes I read the article.
I would surmise that you are referring to the line “while bigger beneficial insects, like bees, are not trapped by the drops”.
The problem here is the word “bigger”. So great, it doesn’t trap bees, that’s something of a step forward. But it will trap other non-targeted smaller insects.