JULY 17 UI PSYLLID/ZEBRA CHIP UPDATE

Published online: Jul 19, 2012 Insecticide, Fungicide
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From The Treasure Valley and Pacific Northwest Pest Alert Network:

"A single potato plant was observed on July 17 at the Kimberly R&E Center with classic zebra chip symptoms: aerial tubers, pink coloration on leaves, curling of leaves and characteristic internal discoloration of tubers. Samples were sent to the University of Idaho campus, but based on symptoms, we are reasonably confident the plant is positive for zebra chip. The plant was pulled from the field and destroyed.

"Additionally, psyllid samples collected on July 3 from two commercial fields in Twin Falls County have tested positive for liberibacter.

"Samples for this week from other fields being scouted by the UI scouting program are still being collected and processed; we will have an update later on findings from these samples.

"Two adult potato psyllids collected on yellow sticky traps from Elmore County on July 15 were taken into the Parma R&E Center. Two adult potato psyllids (one on July 13 and one on July 15) on yellow sticky traps from Minidoka County were taken into the Kimberly R&E Center. These samples will be sent to the University of Idaho campus to test for liberibacter.

"To our knowledge, we have the first (preliminary) finding of a ZC potato plant from this year's planting in the Pacific Northwest this season. However, we continue to encourage scouting in order to make the most sound and appropriate management decisions for a given field.

"Refer to the sites below for guidance on scouting and IPM programs for potato psyllids.

"To view the full alert, and to download any attached files, please go to
www.pnwpestalert.net.

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