This calendar is an ever-expanding database on information about life cycle events for common Missoula County plants, pests, and diseases. Below, you will find information about LEAST-TOXIC treatments (those that have the smallest impact on humans, pests, wildlife and insects, like bees and ladybugs, which benefit the garden) as well as HARD PESTICIDE treatments (those that have greater impact on humans and the environment).
Integrated Pest Management (IPM) strives to optimize plant health by:
IPM also means knowing as much about each pest as possible.
1woody perennial tree care
5Prune out fireblight strikes on hot, dry days. Sterilize pruners between cuts.
8Trees may have spots on leaves from earlier fungal infections, no need to treat in hot, dry weather if you keep irrigation water off leaves!
10Trees may have spots on leaves from earlier fungal infections, no need to treat in hot, dry weather if you keep irrigation water off leaves!
11Aphid populations start to decrease if weather is hot and dry
15Still time to manage Codling Moth, what product you spray determines how often you need to reapply for control.
17Still time to manage Codling Moth, what product you spray determines how often you need to reapply for control.
18Black vine weevil is notching leaves of peonies, lilacs and other landscape plants, treat larva in soil when Spirea vanhoutii is finished blooming.
21Cherry fruit fly is usually in cherries by middle of July - to late to treat
25mow seed producing weeds(like knapweed) when they are in full flower and before they seed.
27Hobo spiders start to move indoors - seal and/or spray foundation perimeters.
29Mourning Cloak Butterfly larvae may be present on aspen, willow, elm and poplar trees. No need to treat them.