Wednesday, January 30, 2013

Tracking Diamond Back Moth (DBM) Resistance Levels

Field populations of diamond back moth (DBM), Plutella xylostella (L.) were detected as moderate to high in insecticide (spinosad) resistance at Hawaii’s large crucifer producing areas such as Maui, Hawaii and Oahu in 2000. Riley and Sparks (2006) suggest that it is highly likely for DBM to become resistant to any class of insecticide given enough time, pressure, and high populations for selections to occur. Extension professionals from the University of Hawaii, College of Tropical Agriculture and Human Resources have worked with commercial crucifer crop growers on an insecticide resistance management program since the initial resistance discovery.
Thirteen year later, DBM Insecticide Resistance Management (IRM) team members, Robin Shimabuku, Dr. Ronald Mau (emeritus), Ming Yi Chou, Randy Hamasaki, Jari Sugano, Steve Fukuda (emeritus) and new CTAHR junior agents, Jensen Uyeda and Sharon Motomura are continuing field and laboratory bioassays to: 1) evaluate new chemical classes for the IRM rotation program and 2) monitor resistance levels for chemicals (new and old) in the current statewide DBM IRM program at least twice a year.
Managing and tracking insecticide resistance in commercial areas is an important component in sustaining Hawaii’s crucifer crop industries.

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