Safer Brand Grub Killer Ready to Spray Concentrate 32 Ounce 5611 Utilizes a derivative of the seed of Neem trees Grub Killer uses 3 modes of action resulting in broad spectrum control OMRI Listed and compliant for use in organic gardening Grub Killer interferes with insect growth functions, and is most effective when applied 2-3 times at 7-10 day intervals This item is not for sale in Catalina Island