Articles by Bill Granger

Mountain Ash Sawfly Larvae Eat Their Way Into Year Three

This is the third, and likely the final, article on Pristophora geniculata, Order Hymenoptera, identified consuming up to 90% of the foliage of certain Mountain Ash trees in Metro Vancouver, BC in 2015, with subsequent defoliation in summers of 2016, 2017. This chewing insect pest was previously reported in Ontario after 1938, of European origin, … read more of Mountain Ash Sawfly Larvae Eat Their Way Into Year Three.

Mountain Ash Sawfly Persists in the Pacific Northwest

This article is offered as a follow-up to last year’s article on Mountain Ash Sawfly, a new pest in the Pacific Northwest that had previously only been a problem to ornamental Mountain Ash specimens east of Michigan. The emerging population is persisting and appears to have increased range in 2016. The larval stage of this … read more of Mountain Ash Sawfly Persists in the Pacific Northwest.

Mountain Ash Sawfly Makes a Surprise Entry to the Pacific Northwest

After a hard day of pruning, mulching, and watering at my place on Bowen Island, BC in mid-June, I finally sat down to admire the airy look of the plantings along the front walkway. With the bright sun going down in the background, one tree looked a little too airy, so I went out to … read more of Mountain Ash Sawfly Makes a Surprise Entry to the Pacific Northwest.