I'm no help. We're far enough down in the Midcoast that we don't have those issues. I had no idea it could be like that way up there. My sympathies. But, there are some Canadian forums, one called "Gardening in Canada." Some of those Canadians have darn near tropical temps in the summer, if you ask me, but you might get an answer from somebody in the colder regions who can help. I'd also try some of the colder Midwest forums, like Wisconsin. They can get hot in the summer, but maybe somebody by the Great Lakes has similar problems, Just read your post recently about slugs and electricity. Thanks for the tip!

Also, the New England forum is much more active. Post there!

Thanks I'll do that.

I live outside of Portland, but have gardened in many countries. One thing that really helps is to figure out what grows well where you are and what doesn't. It's worth noting that powdery mildew, the fungal disease I have the most of, is actually a disease from being too dry. You also want to make sure you are not sprinkling and making your foliage damp overnight. Get soaker hoses and water the roots.

What are you trying to grow? That will effect your success as Sigurd said, and trying to grow warm-weather crops such as tomatoes, eggplant, and peppers isn't likely to be successful in your area.

What are you trying to combat with Aliette? (The term fungus is an entire kingdom of plants, and you need to know what specific kind of fungus to know whether particular fungicides are likely to work.). I tend to reduce disease with cultural practices where ever possible. If it is fungus on the plant leaves such as powdery mildew, that will be different than mushrooms in the soil that won't harm the plants.

One possibility is to make a high tunnel to increase warmth. You can roll up the sides on sunny days for air circulation and roll them down at night or on cloudy days to decrease air-borne moisture. Leaving the sides down on sunny days will cook your plants, so this will take some care to make it work well. Or cover the high tunnel with spun bond row cover instead of plastic, and it will keep the area a bit warmer but still allow air circulation and no overheating.

Creating raised beds will help with drainage and the soil will warm up faster in the spring.

Any seeds you plant should have disease resistance on the package. The more disease resistant your varieties, the more likely you will have success.

I'm way up north on the Can. border. fungus diseases are bad here and our soils terrible rocky clay. to get anything to grow, i use raised beds, even for my apple trees. without it, the roots stunt and rot. to combat mold, fungus and bugs i use de and 1/8 c pure neem oil diluted with warm water and a squirt of plain dawn soap. spay the entire plant and soil at sunset once a week. shake sprayer often to keep oil mixed. all natural and i find works better than fungicides and pesticides. slugs don't like de as its like crossing sandpaper. reapply in a circle around your plants. the electric idea sounds great too! i heard copper tape works also.