We have both the black head caterpillar and the rhinoceros beetle doing our coconut trees in... Worse than that, is when we go to the Thai ag people, they have no recommendations for eradication and tell us to check the Internet... Well, duh, that's what I did and I found some purported effective measures against the black heads: Control of coconut black-headed caterpillar (Opisina arenosella Walker) by systemic application of ‘Soluneem’ – A new water-soluble neem insecticide formulation ... Anybody have any experience with Suluneem or similar?