This weekend, was at the Lilac Festival at the Royal Botanical Gardens in Hamilton. Not all the Lilacs were not in full bloom yet, but there were many beautiful blossoms.
Noticed an army of Caterpillars on the trunk of an Oak tree. These are Gypsy Moth Caterpillars. These can be a destructive force - eating the leaves and defoliating many trees. Their populations tends to go in cycles. For several years there may be minimal populations, but then over a few years, the numbers seem to increase until one year there are so many that large mature trees can be defoliated. And there can be many trees in an area that will be affected.
No indications so far if there is any problems in this area but a search on Google news did reveal some spraying was planned in various communities across North America.