Understanding host use by psyllids (Hemiptera: Psylloidea) benefits from comparative studies of behavior on host and nonhost plant species. While most psyllid species develop on one or a few closely related plant species, some species are generalized enough to develop on species across plant families. We used electropenetography (EPG) technology to compare probing activities of an oligophagous psyllid (Bactericera cockerelli (Šulc)) and a host-specialized psyllid (Bactericera maculipennis) on two species of Solanaceae (potato, Solanum tuberosum L. and matrimony vine, Lycium barbarum L.) and two species of Convolvulaceae (field bindweed, Convolvulus arvensis L. and sweet potato, Ipomoea batatas). Bactericera cockerelli develops on all four species, albeit with longer development times on Convolvulaceae. Bactericera maculipennis develops only on Convolvulaceae. Bactericera cockerelli fed readily from phloem of all four species, but the likelihood of entering phloem and duration of time in phloem was reduced on suboptimal hosts (Convolvulaceae) relative to behavior on Solanaceae. We observed instances of cycling between bouts of phloem salivation and ingestion in assays of optimal (Solanaceae) hosts not observed on Convolvulaceae. The Convolvulaceae-specialized B. maculipennis (Crawford) failed to feed from phloem of nonhosts (Solanaceae). Both psyllid species readily ingested from xylem of all plant species, irrespective of host status. Our finding that phloem feeding by B. maculipennis did not occur on potato has implications for understanding epidemiology of phloem-limited psyllid-vectored plant pathogens. Our results also showed that EPG assays detect subtle variation in probing activities that assist in understanding host use by psyllids.

中文翻译：

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两种细菌（半翅目：木虱科：Triozidae）对寄主和非寄主植物的探针探测行为

了解木虱（半翅目：木虱）对宿主的使用受益于对宿主和非宿主植物物种行为的比较研究。虽然大多数木虱物种在一种或几种密切相关的植物物种上发育，但一些物种的泛化程度足以在植物科的物种上发育。我们使用电子渗透图 (EPG) 技术比较了寡食木虱 (Bactericera cockerelli (Šulc)) 和宿主特化木虱 (Bactericera maculipennis) 对两种茄科植物（马铃薯、马铃薯和枸杞、枸杞）的探测活动。 L.) 和旋花科的两种（旋花旋花L.和甘薯Ipomoea batatas）。Bactericera Cockerelli 在所有四个物种上都有发育，尽管旋花科的发育时间更长。Bactericera maculipennis 仅在旋花科上发育。Bactericera Cockerelli 很容易从所有四种物种的韧皮部进食，但相对于茄科的行为，次优宿主（旋花科）进入韧皮部的可能性和在韧皮部中的持续时间降低。我们观察到在旋花科未观察到的最佳（茄科）宿主的测定中，韧皮部流涎和摄入之间循环的实例。旋花科特化的 B. maculipennis (Crawford) 不能从非寄主 (茄科) 的韧皮部取食。两种木虱物种都容易从所有植物物种的木质部摄取，无论宿主状态如何。我们发现 B. maculipennis 的韧皮部摄食没有发生在马铃薯上，这对理解韧皮部限制的木虱载体植物病原体的流行病学具有重要意义。