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wiliwili tree pests

 

Bruchid beetles (Specularis impressithorax) emerged from wiliwili seeds collected in September 2008. These seeds were stored in a glass jar for six months. the beetles lay dormant inside the seed and eat their way out through little hatches. One seed was infested with six beetles. Finding them emerged after a six months hibernation was a surprise. I  selected only seeds that were free from any penetrations, some were just pin pricks, but apparently these parasites were already inside. This bit of news is disturbing for all the seeds that were collected in the effort to save the wiliwili trees unless precautions were made to kill the beetles prior to storing them in one location.  After two hours in the freezer, these beetles came back to life as soon as they were exposed to room temperature.     According to the link http://www.hear.org/species/erythrina_sandwicensis/pdfs/wiliwiliseedform.pdf using water to test whether a seed float to determine that it is infected, is not fool proof. I discovered a seed that has tell tale signs of infection, a circular bump similar to a pimple on its skin where a beetle will exit. This seed sank to the bottom like other supposedly clean seeds, but when cut open, I found a dead beetle below the bump. Freezing the seed and everything else with it may kill the beetle but not its eggs. I supposed I will have to find out by experiment.

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