LIFE and RMH held an educational workshop on Iris Yellow Spot Virus (IYSV) in Waianae on May 4, 2012 at Katsu Kobashigawa's farm. Dr. John Hu and Dr. Wayne Borth started off the workshop by talking about the pathogen, IYSV. Maui Extension Agent, Robin Shimabuku provided an overview about the insecticide trials conducted in conjuction with emeritus Extension specialist, Dr. Ronald Mau. Extension agent Jari Sugano provided an overview of IYSV best management practices (included insect vector identification, field scouting, cultural practices, insecticide resistance management, pesticide education, etc.) and shared an additional tool in managing IYSV, USDA crop insurance programs. CTAHR pesticide specialists, Dr. Mike Kawate, Charlie Nagamine, and Cathy Tarutani were present to answer grower's questions regarding pesticide use, as well as Daisuke Inoyama and Steven Ogata from HDOA. CTAHR entomologists, Drs. Koon Hui Wang and Helen Spafford along with Dr. Ted Radovich and Jensen Uyeda from the CTAHR Sustainable and Organic Agriculture program were also there to support the group's educational efforts and provide technical assistance to growers with questions. Representatives from agricultual chemical companies such as BEI, Pacific Agricultural and CPS Hawaii were also in attendance. Extension agent Steve Fukuda (semi retired), Shimabuku, and Kawate organized a demonstration using kaolin clay to show how changes in spray variables affect overall coverage.
Dr. John Hu provides overview of IYSV in English and Chinese
Dr. Wayne Borth discussed the different techniques used to identify the disease
Extension agent Robin Shimabuku shared advances based on Maui's insecticide trials.
Extension agents, Robin Shimabuku and Steve Fukuda utilized kaolin clay to demonstrate the role of spray coverage in onion thrip management
Changes in spray variables (such as nozzles, PSI, speed, etc) affect spray coverage
Growers were able to see first hand IYSV symptoms in a field setting
Green onions sprayed with kaolin clay for demonstration purposes
Kaolin clay allowed growers to see where the spray was deposited. In previous CTAHR spray demonstrations, a fluorescent dye was used with a black light system.
Weed management is important as weeds such as pig weed serves as a host for IYSV
Special thanks to Katsu Kobashigawa and Lisa Salazar for hosting the LIFE/ RMH educational event.