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IOBC Canada 2017 – Part III

This post is a part of a series of notes taken at the International Organization of Biological Control 2017.

Go back to Monday’s Agenda

Foraging and egg-laying behaviour of the coccinellid predator Rhyzobius lophanthae
Marjolein Kruidhof, Wageningen University & Research, BU Greenhouse Horticulture

  • Diaspis boisduvalii scales in cymbidium; major problem in Netherlands and they don’t know what to do anymore to control
    • Due to restrictions of use of chemicals (i.e. neonics), they have been unable to control the scale
  • Cage experiment; comparison of different natural enemies of Diaspis boisduvalii scales
  • Tried 8 different treatments, different release rates and frequencies of release of Rhyzobius lophanthae larvae or adults (with or without ephestia eggs)
  • In control, plant was covered with the scale at the end (5 weeks later)
    • When releasing R. lophanthae adults and ephestia eggs, got excellent control
  • R. lophanthae is a predatory beetle
    • Adults are about 2.5mm in small
    • Specialist predators of the Diaspididae family
    • Lays eggs under the shields of adult female scales

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