New Zealand Plant Protection 66 (2013): 349-355
A main crop summer potato trial at Pukekohe assessed the damage caused by Bactericera cockerelli, tomato potato psyllid (TPP), and investigated the use of action spray thresholds. Five treatments were used: in-furrow insecticide and weekly blocks of foliar sprays; in-furrow insecticide and one of three different threshold-based foliar spray programmes; and no insecticides. The threshold-based spray programmes used either the number of TPP nymphs per middle leaf or the mean number of TPP adults per yellow sticky trap per week, plus different mode-of-action insecticide rotations. Three treatments resulted in acceptable yield and specific gravity, and a low incidence of zebra chip disease (ZC). These were the weekly treatment and two spray programmes based on a threshold of >3 TPP adults per trap per week where insecticide applications were reduced by 50% compared to the weekly applications.
Keywords: tomato-potato psyllid, Bactericera cockerelli, potatoes, insecticide trials, action thresholds.
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Copyright © 2013 New Zealand Plant Protection Society (Inc.).