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12 October 2017 Phenology of the Potato Psyllid, Bactericera cockerelli (Hemiptera: Triozidae), and “Candidatus Liberibacter solanacearum” in Commercial Potato Fields in Idaho
Erik J. Wenninger, Amy Carroll, Jennifer Dahan, Alexander V. Karasev, Michael Thornton, Jeff Miller, Philip Nolte, Nora Olsen, William Price
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Abstract

Zebra chip disease (ZC) is an emerging disease of potato in which tubers are produced with striped necrotic patterns that make them unmarketable. ZC is associated with the bacterium “Candidatus Liberibacter solanacearum” (Lso), which is transmitted by the potato psyllid, Bactericera cockerelli (Šulc; Hemiptera: Triozidae). First found in Idaho during 2011, ZC now contributes to increased production costs each season via additional insecticide sprays. To clarify the extent and severity of the threat of ZC in Idaho, we sampled potato psyllids in commercial potato fields across the state over four growing seasons (2012–2015). All life stages of psyllids were sampled using a combination of methods (yellow sticky traps, vacuum samples, and leaf samples), and adult psyllids were tested for the presence of Lso by Polymerase Chain Reaction (PCR). Abundance of potato psyllids initially increased gradually over each growing season, then exhibited a sharp late-season rise and a sharp decline as most fields were being harvested. Abundance of psyllids was higher at warmer, lower elevation sites, but infestation onset did not differ between growing regions. Fewer psyllids were collected in vacuum samples than in sticky trap samples. Nymphs and eggs were found only late season and during years with high abundance of adults. Overall incidence of Lso was similar among all years but one. The results presented here clarify our understanding of the seasonal phenology of potato psyllids and Lso in Idaho potato fields and will aid in developing integrated management strategies against this important pest of potato.

© The Authors 2017. Published by Oxford University Press on behalf of Entomological Society of America. All rights reserved. For permissions, please e-mail: journals.permissions@oup.com.
Erik J. Wenninger, Amy Carroll, Jennifer Dahan, Alexander V. Karasev, Michael Thornton, Jeff Miller, Philip Nolte, Nora Olsen, and William Price "Phenology of the Potato Psyllid, Bactericera cockerelli (Hemiptera: Triozidae), and “Candidatus Liberibacter solanacearum” in Commercial Potato Fields in Idaho," Environmental Entomology 46(6), 1179-1188, (12 October 2017). https://doi.org/10.1093/ee/nvx158
Received: 5 July 2017; Accepted: 31 August 2017; Published: 12 October 2017
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