Larvae Found on Recent X-Rays

After x-ray round 2 we have found larvae in six seed samples, which is exciting for the project:

  • Chamaecyparis thyoides from LongwoodGardens in Kennett Square, PA were infested with larvae.  One sample had 5 infested seeds of a total of 175 (2.9% infestation rate) and another had 1 of 161 seeds infested (0.6%).
  • 1 of 173 seeds were infested (0.6%) in a sample of Chamaecyparis thyoides from North Carolina Botanical Gardens.  We processed two infested Chamaecyparis thyoides samples from this location last year.  This result was expected both because of the findings from 2011, but also because Megastigmus thyoides was first discovered by Turgeon in North Carolina in 1994.
  • Two samples of Cyrptomeria japonica from New York Botanical Gardens were infested, 10 of 980 seeds (1.0%) for one sample and 181 of 1185 (15.3%) for the other.  We received an infested sample of this species last year, but from another location.
  • Finally, 2 of 16 seeds (12.5%) from Juniperus virginiana from New York Botanical Gardens are believed to have larvae in them, but we are less sure of this result. 

We have placed the infested seeds, along with any cones and seeds not used in processing the sample for x-rays, outside in our insectarium in hopes of rearing insects.  In the case of Juniperus virginiana, the extra cones have been processed and we will x-ray these additionally to try and confirm larval presence.

There are 16 samples that are now prepared for the final x-ray round, as well as seed discards from 2 seedlots.  We hope to acquire the discards of 4 more seedlots in the coming weeks and x-ray those as well.

Infestation of Cryptomeria japonica 'Sekkan-sugi' from New York Botanical Gardens

Infestation of Cryptomeria japonica ‘Sekkan-sugi’ from New York Botanical Gardens

Infestation of Chamaecyparis thyoides from Longwood Gardens

Infestation of Chamaecyparis thyoides from Longwood Gardens (one larvae inside a seed in the centre sample, 5 in the bottom left sample)

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