Population Graphs of Psyllids and Parasitoids on Red Gum
© The Regents of the University of California, (2004)

The following graphs plot the numbers of red gum lerp psyllid female adults caught per week in traps set in many California areas. We have found that female adults in traps are the most reliable indicators of psyllid levels on foliage. Error bars around the female psyllid means indicate how variable the traps were. Also plotted are release dates of parasitoid natural enemies and parasitoids per trap. On some plots we have noticed up to four new species of free-living brown-colored psyllids. Brown psyllids per trap with error (all species) are plotted when they present in significant numbers.

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