I got red beetles taking out my watermelon and pumpkin leaves, small black beetles mostly harmful because some predator wiped those out, maybe the sparrows. Then I have nocturnal large thumb sized beetles who can take out all new mango flushes overnight. Those I have not seen but away of the type from the poop they leave behind.
Ah, so how to get beetles? I read online about these traps, so I made my own with a giant 50l tank and a funnel, in the tank put yeast, bagasse, and papaya. It is supposed to ferment and give off a strong smell that attracts the beetles. Day 3 the smell is not so strong yet, perhaps should have used white sugar, totally forgot bagasse will slow down the bacteria.
It is basically just an oversized white fly trap with this smelly lure.
Plenty of DIY videos on youtube to make these traps and white fly traps.