D16

ACP is a key pest of Florida citrus mainly due its role in spreading “huanglongbing” or citrus greening. Insecticides with new modes of action are needed as rotation partners for older materials in order to slow selection for resistance. The trial was conducted at the University of Florida Southwest Research and Education Center in Immokalee, Florida, on young ‘Hamlin’ orange trees budded to ‘US-802’ pummalo x trifoliate rootstock and planted in May 2010 at 8 ft within rows spaced 18 ft apart to give 303 trees/ac. Ten treatments were assigned to 8-tree plots in an RCB design with 4 replicates. Applications were made 11 Jul 2011 using a 12 volt battery powered 25 gal Northstar sprayer operating at 40 psi delivering 150 gpa spraying to runoff. Trees were evaluated weekly throughout the trial. Five young shoots were removed per plot and psyllid eggs and nymphs counted under a stereoscopic microscope. Density of ACP adults was assessed weekly starting at 2 DAT from the 5 center trees in each plot. A randomly chosen branch was struck 3 times with a piece of PVC pipe, dislodging insects that fell onto a white plastic clipboard to be counted for one “tap” sample. All data were subjected to ANOVA for treatment effect on ACP with means separated using LSD (P = 0.05).