Hi Berta;
your reference to the spruce budworm spray program here in New Brunswick,
brought to mind a lesson we were told when I first arrived in Whitehorse Yukon with the RCAF in 1962 when we were out fishing on one of the many lakes in the area. Always wear a lifejacket, it will not save your life as due to the cold water conditions all year round, you would expire pretty early but it sure as hell made finding your body that much easier.
Take care. rj