This research: 1) addresses the impact of Glassy-winged sharpshooter (GWSS)on navel orange yield, and distribution of fruit size when GWSS are controlled compared to untreated blocks of Valencia oranges, and ‘Washington’ navel oranges; 2) Evaluates the effects of high GWSS populations have on fruit quality (sugar/acid ratios, peel thickness, sugar/acid ratio, juice quality, peel texture and firmness, susceptibility to post-harvest disorders) in Valencia and Navel oranges; 3) Evaluates the effects of large GWSS populations have on water stress, nutrient loss (Ca etc.), metabolite loss (amino acids, xylem translocated PGRs) due to xylem feeding and fruit drop and fruit quality, and fruit drop; and 4) Determines if Admire enhances fruit size, tree health and vigor in the absence of GWSS.