Central Oregon Potato Extension Program, 2014

Series/Report Number: COARC2014

Abstract: Insect pests were monitored in potato fields to assess potential risk of disease transmission. Aphid, tuberworm moths, and potato psyllids were collected and counted weekly using water pans for aphids, delta traps for potato tuberworm and yellow sticky traps for psyllids. This information was distributed to growers, fieldman and industry representatives through the Potato Patches newsletter. During 2014 aphid numbers were moderately high at the beginning of the season, averaging fifteen to seventy-seven aphids per trap before decreasing to below twenty in mid-July, followed by a slight rebounded in mid-September. Potato tuberworm moths were found in very low numbers through the season. During 2014 the first recorded incidence of potato psyllid was detected in Jefferson County. Specimens were tested for the pathogen causing zebra chip, (Candidatus Liberibacter solanacearum), and all tested negative. Early blight prediction modeling and crop water use data provided helpful information for seed potato management. Weekly monitoring and reporting through the Potato Patches newsletter continues to be a significant source of information for integrated pest management in Central Oregon potato fields.