The key pests of Brassica crops, diamondback moth (DBM), is particularly hard to manage. It has been known to destroy Brassica and canola crops and cause economic damage to those industries in Australia and overseas. The annual cost of controlling DBM globally is estimated at $1 billion. Suppressing DBM infestation has involved the widespread use of insecticides, which has exaberated the problem for most growers as the pest has developed a decreased susceptibility to many chemicals over time.