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In recent intensive sampling of insecticide-free potatoes at Pukekohe, several insect predators and spiders have been found in association with the new pest Bactericera cockerelli, tomato-potato psyllid (TPP). Micromus tasmaniae (brown lacewing), Melanostoma fasciatum (small hover fly), Coccinella undecimpunctata (11-spotted ladybird) and sheet web spiders (Linyphiidae) were collected from potatoes at Pukekohe Research Station and reared in the laboratory to assess their potential as predators against TPP nymphs. Individual predators were presented every 24 h to a maximum of 10 TPP nymphs of different instars ranging from 2 to 4 instar depending on the size of the predator. All predator species fed on TPP nymphs, and all predatory life stages were capable of consuming more than five nymphs per day. Ongoing studies with these species show that all predatory life stages of all predatory species feed on all life stages of TPP. Together with separate data on predator incidence, these results suggest that naturally occurring predators are likely to be important biological control agents of TPP, particularly early in the season when TPP infestations are low.

proceedings of the new zealand weed and pest control conference/new zealand plant protection/proceedings of the ... national weeds conference/proceedings of the new zealand weed control conference/proceedings of the new zealand plant protection conference

Naturally occurring predators of <i>Bactericera cockerelli</i> in potatoes