Hercules beetles can grow as large as 180 millimetres (7 inches).
Building a better butternut
Building a better butternut Scientists are trying to save butternut trees from
a fungal canker which has infected up to 90 per cent of the
butternut trees that grow in Ontario. The canker fungus kills trees
by circling the trunk and cutting off the flow of nutrients from
the roots. DNA evidence suggests the canker originated in Asia.
Researchers are attempting to grow trees resistant to the fungus by
taking samples from trees which appear to be resistant, and growing
seedlings in laboratories and greenhouses. They hope that some
trees will have a genetic resistance to the canker. 20 SEPTEMBER 1997
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