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Container-grown Cycas micronesica seedlings were purposefully infested with Aulacaspis yasumatsui and then installed at 0, 75, or 150 cm above the ground to investigate effects of infestation height on predation by Rhyzobius lophanthae. Signif- icantly more scales on elevated seedlings were attacked by the predator. Our results indicate that lower predation at ground level by R. lophanthae may partly explain why the predator is not effectively controlling this armored scale epidemic on Guam. Ephemeral outbreaks of A. yasumatsui documented in quarterly surveys from Sept. 2006untilAug.2012confirm theinadequate biologicalcontrol.Ourresultsilluminatethe importance of fully evaluating the reliance on an alien predator as a solo biological control agent for an alien pest.

Vertical Stratification of Predation on Aulacaspis yasumatsui Infesting Cycas micronesica Seedlings