08/16/2026
There’s a lot going on in this photo! This is Amelanchier alnifolia, aka Saskatoon berry, a hub of biodiversity! Not only do the white flowers in spring provide an early nectar source for pollinators but the berries are a bonanza for birds, insects and even fungus. One of the few berries recognizable to everyone and falling on the good for you to eat category, you can’t go wrong adding these to your yard!
Then there are the leaves. Here we can see at least 2 invertebrates taking advantage. Those bumps belong to a gall mite (of which there are at least 9 that use Amelanchier as their host). These mites spend their entire lives inside the plant with those galls being the safe haven for growing larvae. Once they become adults, lacewings, ladybugs and other insects prey on them. Too many on the plant can disrupt the ability of the plant to photosynthesize and gather energy so thank goodness there are those predators!
Then there is the caterpillar. Recognizable to many as a wooly bear, this is the spotted tussock moth’s caterpillar. Typically preferring willow, alder or poplar, they will also eat Saskatoon leaves in a pinch. The adults are out in spring and early summer and the caterpillars emerge in July, continuing to be visible until September. While they look cute and fuzzy, those hairs are their defense and can irritate the skin. This might prevent mammals and birds from preying on them but there are likely parasitic wasps and other predatory insects specializing on them! They fall into the cute, but from a distance category for us! ❤️🐛