Plant Clinic

Pest Management Calendar

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

July 2025

This Month

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29	Jun 30	Jul 1	2	3	4	5
		12:00 am Last Week to Fertilize		12:00 am Check for Twig Blight on Aspen & Poplar Trees
				12:00 am Birch Leaf Miners are pupating - do not treat

6	7	8	9	10	11	12
12:00 am Leaf Spot lesions may develop on Apple, Crabapple, and Aspen leaves			12:00 am New Mountain Pine Beetle attacks start		12:00 am Hobo Spiders Start to Move Indoors

13	14	15	16	17	18	19
12:00 am Prune out fireblight strikes			12:00 am Check inside Cherries		12:00 am Boxelder leafrollers are done for the year
	12:00 am Check for aphids on flowers and vegetable plants

20	21	22	23	24	25	26
12:00 am Check for Leaf hoppers			12:00 am Treat Codling Moth		12:00 am Mow seed producing weeds
	12:00 am Check for Spider Mites

27	28	29	30	Jul 31	Aug 1	2
12:00 am Check for Black Vine Weevil			12:00 am Check for Mourning Cloak Butterfly larvae
12:00 am Check for Apricot scab				12:00 am Check for Apple scab

Last Week to Fertilize (Day 1 of 2 )

Starts 12:00 am

Last Week to Fertilize (Day 2 of 2 )

Until 11:00 pm

Check for Twig Blight on Aspen & Poplar Trees (Day 3 of 3 )

Until 11:00 pm

Leaf Spot lesions may develop on Apple, Crabapple, and Aspen leaves (Day 1 of 3 )

Starts 12:00 am

Leaf Spot lesions may develop on Apple, Crabapple, and Aspen leaves (Day 2 of 3 )

All Day

Leaf Spot lesions may develop on Apple, Crabapple, and Aspen leaves (Day 3 of 3 )

Until 11:00 pm

New Mountain Pine Beetle attacks start (Day 1 of 2 )

Starts 12:00 am

New Mountain Pine Beetle attacks start (Day 2 of 2 )

Until 11:00 pm

Hobo Spiders Start to Move Indoors (Day 1 of 2 )

Starts 12:00 am

Hobo Spiders Start to Move Indoors (Day 2 of 2 )

Until 11:00 pm

Prune out fireblight strikes (Day 1 of 2 )

Starts 12:00 am

Check for aphids on flowers and vegetable plants (Day 2 of 2 )

Until 11:00 pm

Check inside Cherries (Day 1 of 2 )

Starts 12:00 am

Check inside Cherries (Day 2 of 2 )

Until 11:00 pm

Boxelder leafrollers are done for the year (Day 1 of 2 )

Starts 12:00 am

Boxelder leafrollers are done for the year (Day 2 of 2 )

Until 11:00 pm

Check for Leaf hoppers (Day 1 of 2 )

Starts 12:00 am

Check for Spider Mites (Day 2 of 2 )

Until 11:00 pm

Treat Codling Moth (Day 1 of 2 )

Starts 12:00 am

Treat Codling Moth (Day 2 of 2 )

Until 11:00 pm

Mow seed producing weeds (Day 1 of 2 )

Starts 12:00 am

Mow seed producing weeds (Day 2 of 2 )

Until 11:00 pm

Check for Black Vine Weevil (Day 3 of 3 )

Until 11:00 pm

Check for Mourning Cloak Butterfly larvae (Day 1 of 2 )

Starts 12:00 am

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.