Plant Clinic

Pest Management Calendar

This calendar provides information about life cycle events for common Missoula County plants, pests, and diseases.

August 2026

This Month

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26	27	28	29	30	Jul 31	Aug 1
						12:00 am Check for Elm Leaf Beetle larva

2	3	4	5	6	7	8
12:00 am Check for Elm Leaf Beetle larva	12:00 am Manage for Codling Moth		12:00 am Check for Leaf Scorch Symptoms			12:00 am Knapweed in full bloom

9	10	11	12	13	14	15
12:00 am Knapweed in full bloom	12:00 am Check for second generation Leafroller larva and Apple Skeletonizer			12:00 am Check for Fall Webworms		12:00 am Check for Elm leaf beetle eggs

16	17	18	19	20	21	22
12:00 am Check for Elm leaf beetle eggs	12:00 am Check for Aspen Leaf Spot fungus			12:00 am Treat for Western Raspberry Fruit Worm

23	24	25	26	27	28	29
12:00 am Knapweed seeds forming	12:00 am Check for second generation Elm Leaf beetle		12:00 am Treat for Aphids			12:00 am Start decreasing irrigation

30	Aug 31	Sep 1	2	3	4	5
12:00 am Start decreasing irrigation

Check for Elm Leaf Beetle larva (Day 1 of 2 )

Starts 12:00 am

Check for Elm Leaf Beetle larva (Day 2 of 2 )

Until 11:00 pm

Manage for Codling Moth (Day 1 of 2 )

Starts 12:00 am

Manage for Codling Moth (Day 2 of 2 )

Until 11:00 pm

Check for Leaf Scorch Symptoms (Day 1 of 3 )

Starts 12:00 am

Check for Leaf Scorch Symptoms (Day 2 of 3 )

All Day

Check for Leaf Scorch Symptoms (Day 3 of 3 )

Until 11:00 pm

Knapweed in full bloom (Day 1 of 2 )

Starts 12:00 am

Knapweed in full bloom (Day 2 of 2 )

Until 11:00 pm

Check for second generation Leafroller larva and Apple Skeletonizer (Day 1 of 3 )

Starts 12:00 am

Check for second generation Leafroller larva and Apple Skeletonizer (Day 2 of 3 )

All Day

Check for second generation Leafroller larva and Apple Skeletonizer (Day 3 of 3 )

Until 11:00 pm

Check for Fall Webworms (Day 1 of 2 )

Starts 12:00 am

Check for Fall Webworms (Day 2 of 2 )

Until 11:00 pm

Check for Elm leaf beetle eggs (Day 1 of 2 )

Starts 12:00 am

Check for Elm leaf beetle eggs (Day 2 of 2 )

Until 11:00 pm

Check for Aspen Leaf Spot fungus (Day 1 of 3 )

Starts 12:00 am

Check for Aspen Leaf Spot fungus (Day 2 of 3 )

All Day

Check for Aspen Leaf Spot fungus (Day 3 of 3 )

Until 11:00 pm

Treat for Western Raspberry Fruit Worm (Day 1 of 3 )

Starts 12:00 am

Treat for Western Raspberry Fruit Worm (Day 2 of 3 )

All Day

Treat for Western Raspberry Fruit Worm (Day 3 of 3 )

Until 11:00 pm

Knapweed seeds forming

12:00 am - 11:00 pm

Check for second generation Elm Leaf beetle (Day 1 of 2 )

Starts 12:00 am

Check for second generation Elm Leaf beetle (Day 2 of 2 )

Until 11:00 pm

Treat for Aphids (Day 1 of 3 )

Starts 12:00 am

Treat for Aphids (Day 2 of 3 )

All Day

Treat for Aphids (Day 3 of 3 )

Until 11:00 pm

Start decreasing irrigation (Day 1 of 3 )

Starts 12:00 am

Start decreasing irrigation (Day 2 of 3 )

All Day

Start decreasing irrigation (Day 3 of 3 )

Until 11:00 pm

Using Integrated Pest Management (IPM) strategies

IPM means getting to know your pests.

When is the pest MOST vulnerable, infective, or invasive?
When is the pest most vulnerable to least-toxic management strategies?
What is the least-toxic management tool that can be used successfully?

IPM optimizes plant health through the following:

Managing garden and landscape soils to promote drainage and aeration
Maximizing soil health by adding organic matter and properly timed fertilizers.
Pruning and irrigating based on the needs of particular plants.
Knowing the plant's level of susceptibility to pest damage.