New Zealand Plant Protection 66 (2013): 365-373
The impact of post acquisition period (PAP) on detection of Candidatus Liberibacter solanacearum (Lso) in adult tomato potato psyllid (TPP; Bactericera cockerelli) was investigated using qPCR assays on whole insects. Lso in adults was initially tested immediately after acquisition access periods (AAP) of 15, 24, 48, 72, 96 h or 1 week on Lso-infected tomato leaves. These results were compared with those from adults with 15 or 24 h AAP followed by 24-, 48- or 72-h PAP on Lso-free tomato leaves. From 15-20 individuals of each treatment tested, 5-15% were positive for Lso immediately after AAP of 15 or 24 h. That increased to 84% and 100% with 24- and 48-h PAPs respectively, but decreased to 25-47% after 72 h. Longer AAP (48 h-1 week) without PAP did not exceed 55% acquisition success. The phloem ingestion and possible acquisition of Lso during 15 and 24 h plant access periods are discussed.
Keywords: tomato/potato psyllid, Candidatus Liberibacter solanacearum, post acquisition period, phloem ingestion, detection.
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