TreeIssues

Pest & Disease Forecast for Colorado

It's September — 225 tracked threats are active right now in Colorado. Each timeline shows estimated activity across the year.

Active nowWatch closely — these threats are at or near peak activity this month.
Emerald Ash Borer
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Mountain Pine Beetle
InsectCRITICAL

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Ips Bark Beetles
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Dutch Elm Disease
DiseaseCRITICAL

Peak activity: Spring

J
F
M
A
M
J
J
A
S
O
N
D
Powdery Mildew
FungusLOW

Peak activity: Spring

J
F
M
A
M
J
J
A
S
O
N
D
Thousand Cankers Disease
DiseaseHIGH

Peak activity: Spring

J
F
M
A
M
J
J
A
S
O
N
D
Dothistroma Needle Blight
FungusMODERATE

Peak activity: Spring

J
F
M
A
M
J
J
A
S
O
N
D
Rhizosphaera Needlecast
FungusHIGH

Peak activity: Spring

J
F
M
A
M
J
J
A
S
O
N
D
Stigmina/SNEED Needlecast
FungusHIGH

Peak activity: Spring

J
F
M
A
M
J
J
A
S
O
N
D
Cytospora Canker
FungusHIGH

Peak activity: Spring

J
F
M
A
M
J
J
A
S
O
N
D
Verticillium Wilt
FungusHIGH

Peak activity: Spring

J
F
M
A
M
J
J
A
S
O
N
D
Bronze Birch Borer
InsectHIGH

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Leaf Spot Diseases
FungusLOW

Peak activity: Spring

J
F
M
A
M
J
J
A
S
O
N
D
Seven-spotted Lady Beetle
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Asian Lady Beetle
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
LeConte's Giant Lady Beetle
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Red Admiral
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
White-lined Sphinx
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Painted Lady
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Mourning Cloak
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Eastern Boxelder Bug
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
North American Common Water Strider
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Small Milkweed Bug
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Asian Longhorned Beetle Damages hardwood trees by tunneling deep into trunks and branches
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Convergent Lady Beetle
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Parenthesis Lady Beetle
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Sutured Longhorn Beetle
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Monarch
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Gray Hairstreak
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Taxiles Skipper
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Microvelia
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Veiled Polypore
FungusMODERATE

Peak activity: Spring

J
F
M
A
M
J
J
A
S
O
N
D
Cottonwood Stag Beetle
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Japanese Beetle
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
sunflower beetle
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Two-tailed Swallowtail
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Gravel Ground Beetle
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Blue-bordered Pedunculate Ground Beetle
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Common Fieldcap
FungusMODERATE

Peak activity: Spring

J
F
M
A
M
J
J
A
S
O
N
D
Asian Carpet Beetle
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Bumble Flower Beetle
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Large Yellow Underwing
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Graphocephala lugubris
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Ten-lined June Beetle
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Red-femured Milkweed Borer
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Idaea gemmata
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Yellow-fringed Dolichomia Moth
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Clover Hayworm Moth
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Obscure Plant Bug
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Charcoal Seed Bug
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Black Witch
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Sooty-winged Chalcoela Moth
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Oleander Aphid
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Punctured Tiger Beetle
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Southern Masked Chafer
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Glossy Black Idia Moth
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Queen Alexandra’s Sulphur
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Western Tiger Swallowtail
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Plains Bee Assassin
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Giant Sawgill
FungusMODERATE

Peak activity: Spring

J
F
M
A
M
J
J
A
S
O
N
D
Many-spotted Tiger Moth
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Topiary Grass-veneer
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Four-spotted Moth
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Plains Cicada
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Glyphidocera septentrionella
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Master's Dart
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Brother Moth
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Darker-spotted Straw Moth
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Four-spotted Yellowneck Moth
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Rocky Mountain Parnassian
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Morning-glory Plume Moth
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Twice-stabbed Lady Beetle
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Squash Bug
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Four-spotted Sap Beetle
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Large Milkweed Bug
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Shaggy Parasol
FungusMODERATE

Peak activity: Spring

J
F
M
A
M
J
J
A
S
O
N
D
Pale Brittlestem
FungusMODERATE

Peak activity: Spring

J
F
M
A
M
J
J
A
S
O
N
D
Ruby Porcini
FungusMODERATE

Peak activity: Spring

J
F
M
A
M
J
J
A
S
O
N
D
Western Leaf-footed Bug
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Harlequin Bug
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Hairy Pine Borer
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Fire-necked Longhorn Beetle
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Spotted Pine Sawyer
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Obscure Darkling Beetle
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
California Warrior Beetle
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Snakeweed Borer Moth
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Armyworm Moth
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Jagged Ambush Bug
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Short-lined Chocolate
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Filbertworm Moth
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Three-ribbed Darkling Beetle
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Big-headed Ground Beetle
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Lilac Root Weevil
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Masked Hunter
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Two-spotted Stink Bug
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Stenomorpha opaca
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Carolina Sphinx
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Three-spined Grass Bug
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
crown-tipped coral fungus
FungusMODERATE

Peak activity: Spring

J
F
M
A
M
J
J
A
S
O
N
D
Chevrolat's Dytiscid
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Bead-like Cottonwood Gall aphid
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
black knot
FungusMODERATE

Peak activity: Spring

J
F
M
A
M
J
J
A
S
O
N
D
Orizabus clunalis
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Hollyhock Weevil
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Green Stink Bug
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Fly Agaric
FungusMODERATE

Peak activity: Spring

J
F
M
A
M
J
J
A
S
O
N
D
aspen bolete
FungusMODERATE

Peak activity: Spring

J
F
M
A
M
J
J
A
S
O
N
D
Tricolored Carpet Beetle
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
California Root Borer
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Eleodes fusiformis
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Red-shouldered Bug
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
flocculose inkcap
FungusMODERATE

Peak activity: Spring

J
F
M
A
M
J
J
A
S
O
N
D
Frothy Moth
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Lapland Beard Lichen
FungusMODERATE

Peak activity: Spring

J
F
M
A
M
J
J
A
S
O
N
D
Eleodes acuta
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Green Claybank Tiger Beetle
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Rain Beetle
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Red Turpentine Beetle
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Rustic Harp Ground Beetle
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Rocky Mountain Billbug
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Red-backed Darkling Beetle
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Five-spotted Hawk Moth
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
aspen oyster mushroom
FungusMODERATE

Peak activity: Spring

J
F
M
A
M
J
J
A
S
O
N
D
Pole Borer
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Pale Green Assassin Bug
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Big-eyed Toad Bug
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Bristly Beard Lichen
FungusMODERATE

Peak activity: Spring

J
F
M
A
M
J
J
A
S
O
N
D
Western Sculptured Pine Borer
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Golden Tortoise Beetle
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Dainty Sulphur
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Rough strawberry root weevil
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Knapweed Root Weevil
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Mythicomyces corneipes
FungusMODERATE

Peak activity: Spring

J
F
M
A
M
J
J
A
S
O
N
D
Elastic Saddle
FungusMODERATE

Peak activity: Spring

J
F
M
A
M
J
J
A
S
O
N
D
Sinuate Lady Beetle
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Schinia albafascia
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Extricated Darkling Beetle
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Black Blister Beetle
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Western Conifer Seed Bug
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Sumac Flea Beetle
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Spotted Asparagus Beetle
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Common Pollen Beetle
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
common bird's nest fungus
FungusMODERATE

Peak activity: Spring

J
F
M
A
M
J
J
A
S
O
N
D
stinking parachute
FungusMODERATE

Peak activity: Spring

J
F
M
A
M
J
J
A
S
O
N
D
shaggy scalycap
FungusMODERATE

Peak activity: Spring

J
F
M
A
M
J
J
A
S
O
N
D
Yellow-green Russula Mold
FungusMODERATE

Peak activity: Spring

J
F
M
A
M
J
J
A
S
O
N
D
Tomentose Burying Beetle
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Salt-loving Agaricus
FungusMODERATE

Peak activity: Spring

J
F
M
A
M
J
J
A
S
O
N
D
Soapy Trich
FungusMODERATE

Peak activity: Spring

J
F
M
A
M
J
J
A
S
O
N
D
Green-spored Parasol
FungusMODERATE

Peak activity: Spring

J
F
M
A
M
J
J
A
S
O
N
D
Brown Tile Lichen
FungusMODERATE

Peak activity: Spring

J
F
M
A
M
J
J
A
S
O
N
D
Conifer roundhead
FungusMODERATE

Peak activity: Spring

J
F
M
A
M
J
J
A
S
O
N
D
Smoky-gilled Hypholoma
FungusMODERATE

Peak activity: Spring

J
F
M
A
M
J
J
A
S
O
N
D
Ashy Gray Lady Beetle
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
White-spotted Sawyer
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Tragidion coquus
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Ebony Shield Lady Beetle
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Red Sunflower Seed Weevil
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Figeater Beetle
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Blue Fungus Beetle
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Puncture vine seed weevil
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
White Underwing
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Blowout Tiger Beetle
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Conchuela Bug
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Aphroditeola olida
FungusMODERATE

Peak activity: Spring

J
F
M
A
M
J
J
A
S
O
N
D
The Emperor
FungusMODERATE

Peak activity: Spring

J
F
M
A
M
J
J
A
S
O
N
D
Orange Jelly Spot
FungusMODERATE

Peak activity: Spring

J
F
M
A
M
J
J
A
S
O
N
D
Oak-loving Gymnopus
FungusMODERATE

Peak activity: Spring

J
F
M
A
M
J
J
A
S
O
N
D
Black Vine Weevil
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Barrow's Bolete
FungusMODERATE

Peak activity: Spring

J
F
M
A
M
J
J
A
S
O
N
D
Clover Leaf Weevil
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Strawberry Root Weevil
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Spotted Cucumber Beetle
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Eleodes carbonaria
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Philolithus sordidus
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Garden Webworm Moth
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
American Plum Borer Moth
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
common puffball
FungusMODERATE

Peak activity: Spring

J
F
M
A
M
J
J
A
S
O
N
D
Achemon Sphinx
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Serrated Darkling Beetle
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Bronzed Tiger Beetle
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Canada Thistle Bud Weevil
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Relict Rhinoceros Beetle
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Destructive Pholiota
FungusMODERATE

Peak activity: Spring

J
F
M
A
M
J
J
A
S
O
N
D
Oblique-lined Tiger Beetle
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Black-veined Seed Bug
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Yellow-striped Armyworm Moth
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Merry Graphic Moth
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Conifer Mazegill
FungusMODERATE

Peak activity: Spring

J
F
M
A
M
J
J
A
S
O
N
D
Purple Spindles
FungusMODERATE

Peak activity: Spring

J
F
M
A
M
J
J
A
S
O
N
D
Poplar-and-Willow Borer
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Colorado Soldier Beetle
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Lepiota lilacea
FungusMODERATE

Peak activity: Spring

J
F
M
A
M
J
J
A
S
O
N
D
Corn Earworm Moth
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
American Fly Agaric
FungusMODERATE

Peak activity: Spring

J
F
M
A
M
J
J
A
S
O
N
D
dune stinkhorn
FungusMODERATE

Peak activity: Spring

J
F
M
A
M
J
J
A
S
O
N
D
fairy ring marasmius
FungusMODERATE

Peak activity: Spring

J
F
M
A
M
J
J
A
S
O
N
D
Fringed Larder Beetle
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
gold cobblestone lichen
FungusMODERATE

Peak activity: Spring

J
F
M
A
M
J
J
A
S
O
N
D
Cortinarius pinguis
FungusMODERATE

Peak activity: Spring

J
F
M
A
M
J
J
A
S
O
N
D
Two-spotted Lady Beetle
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Striped Cucumber Beetle
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Meal moth
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Cabbage Looper Moth
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Aspen leaf-pocket aphid
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Genista Broom Moth
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Spined Assassin Bug
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Thinker Moth
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Bindweed Powdery Mildew
FungusMODERATE

Peak activity: Spring

J
F
M
A
M
J
J
A
S
O
N
D
Horse Mushroom
FungusMODERATE

Peak activity: Spring

J
F
M
A
M
J
J
A
S
O
N
D
Armillaria solidipes
FungusMODERATE

Peak activity: Spring

J
F
M
A
M
J
J
A
S
O
N
D
Short-stemmed Russula
FungusMODERATE

Peak activity: Spring

J
F
M
A
M
J
J
A
S
O
N
D
Aesculus leaf blotch
FungusMODERATE

Peak activity: Spring

J
F
M
A
M
J
J
A
S
O
N
D
Honora mellinella
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Locust Borer
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Volupial Mint Moth
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
North American Tarnished Plant Bug
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Garland Roundhead
FungusMODERATE

Peak activity: Spring

J
F
M
A
M
J
J
A
S
O
N
D
Ironweed Curculio
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Eleodes longicollis
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Lateral-lined Water Beetle
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Festive Tiger Beetle
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
Nine-spotted Lady Beetle
InsectMODERATE

Peak activity: Summer

J
F
M
A
M
J
J
A
S
O
N
D
witch's butter
FungusMODERATE

Peak activity: Spring

J
F
M
A
M
J
J
A
S
O
N
D
Banded Mottlegill
FungusMODERATE

Peak activity: Spring

J
F
M
A
M
J
J
A
S
O
N
D
← National forecast|All Colorado threats →|Get monthly care reminders →

Activity windows are seasonal estimates based on pest type and known phenology for the continental US; local timing varies with weather and elevation. Always confirm with a certified arborist or your state extension office.