My brother-in-law, a very successful rubber tree grower in Phattalung, is experimenting with oil palm trees. He says that rats are his biggest problem with the small trees he has started. I'm not there now so I can't visualize the exact problem, but because of the torrential rains that often hit the area it sounds like it's problematic to leave the poison laying around the trees because of standing water. I also heard that there are Warfarin-resistant rats. Any advice that I can forward to him? Thanks.