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.
1Apples with sunken dark spots and leaves that have a velvety brown lesion are infected with apple scab. Treatment in late spring.
5Mow Knapweed before seeds disperse
8leaf scorch on trees and shrubs(papery curled margins) are showing up now, apply 1-2" much and water deeply every 7-10 days
11Second generation leafroller and apple skeletonizer larva feeding on fruit tree leaves now, treat before larva are over 1/2"
15Fall webworms may be present in chokecherries and cottonwoods. Prune out limb
22Aspen leaves that have black spots or black curling leaves may be dropping early due to aspen leaf spot fungus. Rake up leaves to help prevent infection next year.
25Second generation elm leaf beetle larva beginning to hatch. Treat if 75% of leaves infected with larva.
28Second generation elm leaf beetle larva beginning to hatch. Treat if 75% of leaves infected with larva.
29When weather starts to cool down SLOWLY start to decrease water on woody tress and shrubs to help prepare them for winter.