Plant Clinic

Pest Management Calendar

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

August 2024

This Month

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28	29	30	Jul 31	Aug 1	2	3
				Apples with sunken dark spots and leaves that have a velvety brown lesion are infected with apple scab. Treatment in late spring.

4	5	6	7	8	9	10
Apples with sunken dark spots and leaves that have a velvety brown lesion are infected with apple scab. Treatment in late spring.				Leaf scorch on trees and shrubs(papery curled margins) are showing up now, apply 1-2" much and water deeply every 7-10 days
	Mow Knapweed before seeds disperse

11	12	13	14	15	16	17
Second generation leafroller and apple skeletonizer larva feeding on fruit tree leaves now, treat before larva are over 1/2"				Fall webworms may be present in chokecherries and cottonwoods. Prune out limb

18	19	20	21	22	23	24
				Aspen 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.

25	26	27	28	29	30	Aug 31
Second generation elm leaf beetle larva beginning to hatch. Treat if 75% of leaves infected with larva.				When weather starts to cool down SLOWLY start to decrease water on woody tress and shrubs to help prepare them for winter.

Apples with sunken dark spots and leaves that have a velvety brown lesion are infected with apple scab. Treatment in late spring. (Day 1 of 5 )

All Day

Apples with sunken dark spots and leaves that have a velvety brown lesion are infected with apple scab. Treatment in late spring. (Day 2 of 5 )

All Day

Apples with sunken dark spots and leaves that have a velvety brown lesion are infected with apple scab. Treatment in late spring. (Day 3 of 5 )

All Day

Apples with sunken dark spots and leaves that have a velvety brown lesion are infected with apple scab. Treatment in late spring. (Day 4 of 5 )

All Day

Mow Knapweed before seeds disperse (Day 2 of 2 )

All Day

Leaf scorch on trees and shrubs(papery curled margins) are showing up now, apply 1-2" much and water deeply every 7-10 days (Day 1 of 3 )

All Day

Leaf scorch on trees and shrubs(papery curled margins) are showing up now, apply 1-2" much and water deeply every 7-10 days (Day 2 of 3 )

All Day

Leaf scorch on trees and shrubs(papery curled margins) are showing up now, apply 1-2" much and water deeply every 7-10 days (Day 3 of 3 )

All Day

Second generation leafroller and apple skeletonizer larva feeding on fruit tree leaves now, treat before larva are over 1/2" (Day 1 of 3 )

All Day

Second generation leafroller and apple skeletonizer larva feeding on fruit tree leaves now, treat before larva are over 1/2" (Day 2 of 3 )

All Day

Second generation leafroller and apple skeletonizer larva feeding on fruit tree leaves now, treat before larva are over 1/2" (Day 3 of 3 )

All Day

Fall webworms may be present in chokecherries and cottonwoods. Prune out limb (Day 1 of 3 )

All Day

Fall webworms may be present in chokecherries and cottonwoods. Prune out limb (Day 2 of 3 )

All Day

Fall webworms may be present in chokecherries and cottonwoods. Prune out limb (Day 3 of 3 )

All Day

Aspen 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. (Day 1 of 3 )

All Day

Aspen 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. (Day 2 of 3 )

All Day

Aspen 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. (Day 3 of 3 )

All Day

Second generation elm leaf beetle larva beginning to hatch. Treat if 75% of leaves infected with larva. (Day 1 of 4 )

All Day

Second generation elm leaf beetle larva beginning to hatch. Treat if 75% of leaves infected with larva. (Day 2 of 4 )

All Day

Second generation elm leaf beetle larva beginning to hatch. Treat if 75% of leaves infected with larva. (Day 3 of 4 )

All Day

Second generation elm leaf beetle larva beginning to hatch. Treat if 75% of leaves infected with larva. (Day 4 of 4 )

All Day

When weather starts to cool down SLOWLY start to decrease water on woody tress and shrubs to help prepare them for winter. (Day 1 of 3 )

All Day

When weather starts to cool down SLOWLY start to decrease water on woody tress and shrubs to help prepare them for winter. (Day 2 of 3 )

All Day

When weather starts to cool down SLOWLY start to decrease water on woody tress and shrubs to help prepare them for winter. (Day 3 of 3 )

All Day

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.