Losing the fight against the orchid beetle (pest)!

I hate this small orchid pest, a beetle which drops to the ground (escape strategy) when one tries to catch it. It is found everywhere here, even in the cool, highlands. This one I found in Bario, getting ready to chomp on some Phaius tankervilleae flowers. It eats and lays eggs on my vanda flowers. The larvae can reduce several large 5 inch flowers down to nothing in a matter of days. I have had no choice but to resort to chemical warfare but I'm on the losing end at the moment...