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A simple procedure to record parasitoids of armoured scale insects (Diaspididae) is described and illustrated using San Jose scale (SJS, Diaspidiotus perniciosus) on apple wood. Pieces of 2-3 year old SJS infested wood were collected during crawler release periods and kept in moistened Oasis floral foam to prevent desiccation. Neonate crawlers were confined to the twigs for up to 2 weeks in ventilated 30 cm high plastic containers to obtain large numbers of newly settled scale insects. The twigs, still in Oasis, were secured to branches in the same trees from which they had been collected to allow natural parasitism over 2-3 weeks. Twigs were retrieved and returned to the containers for a further 6 weeks. A yellow sticky strip was placed inside the containers to catch emerging parasitoids. The most common parasitoid species caught in a SJS pheromone trap was Encarsia perniciosi, with very low numbers of E. citrina, Aphytis mytilaspidis and Aphytis sp. (? diaspidis). Higher numbers of Encarsia citrina and Aphytis sp. (? diaspidis) were recorded from SJS infested wood. The results indicate that pheromone traps alone do not provide an accurate assessment of the armoured scale insect parasitoid complex on pipfruit.

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

Monitoring techniques reveal differences in the scale parasitoid complex on pipfruit