1a.Objectives (from AD-416):
Assess feeding deterrence effects of Cyazypyr on potato psylllid to prevent or minimize transmission of zebra chip potato disease.
1b.Approach (from AD-416):
Cyazypyr, a DuPont product has been shown to deter feeding and oviposition in Hemipteran insect vectors (e.g., whiteflies and thrips) and preventing disease transmission to vegetable crops. Potato plants in the greenhouse and small field cages will be treated with Cyazypyr and exposed to liberibacter-infective potato psyllids. After insect exposure, the plants will be monitored for zebra chip symptoms to estimate disease incidence.
The bacterium liberibacter that causes zebra chip is rapidly transmitted to potato by the potato psyllid and pesticides may have limited disease control as they may not kill the insect fast enough to prevent liberibacter transmission to potato. Therefore, there is an urgent need to develop management tools that have deterrence and repellency effects to potato psyllid feeding and egg development. Laboratory and field experiments are currently being conducted at USDA-ARS Wapato, WA, to assess feeding deterrence effects of Cyazypyr insecticide on potato psyllid to prevent or minimize transmission of zebra chip. Cyazypyr has been shown to deter feeding and egg development in other insect vectors and preventing disease transmission to vegetable crops. Preliminary research conducted at the ARS Wapato location found that foliar applications of Cyazypyr are effective in preventing transmission of liberibacter to potato plants by the potato psyllid. Information from this research will be incorporated in integrated pest management programs for potato psyllid control to help potato growers affected by zebra chip to quickly minimize losses due to this economically important disease. The work reported here addresses objective 3 of the parent project plan.