Golden Malrin Fly Bait The standard in fly baits for over 30 years, Golden Malrin Fly Bait draws flies in to feed with Muscamone fly attractant. As they feed on the sugar-based bait, the active ingredient methomyl starts killing flies immediately after ingestion. Golden Malrin Fly Scatter Bait can be used in rotaion with QuickStrike Fly Scatter Bait as part of an integrated program to fight flies.