Tree Problem Diagnostic Center

Quick identification guide for tree health issues. Diagnose problems fast, understand symptoms, and discover effective Mauget treatment solutions to save your trees.

Start Problem Identification

High Priority Tree Threats

Critical problems that require immediate attention to prevent tree loss

Ambrosia beetles showing characteristic boring patterns and gallery damage
URGENT

Ambrosia Beetles (Including PSHB)

Ambrosia beetles are weevil subfamily beetles that live in nutritional symbiosis with ambrosia fungi. They excavate tunnels in trees where they cultivate fungal gardens as their sole source of nutrition. The Polyphagous Shot Hole Borer (PSHB) is causing very serious concern and damage in California.

Identify & Treat →
American Plum Borer damage showing characteristic galleries and exit holes
URGENT

American Plum Borer

A cambium-feeding moth pest that bores into trees, creating reddish orange frass and gum pockets (gummosis). The major borer pest of stone fruits and ornamental trees, causing up to 33% decline in life span of cherry trees. Most damaging to scaffold crotches and graft unions of young trees.

Identify & Treat →
Arborvitae branch canker showing characteristic browning and canker formation
URGENT

Arborvitae Branch Canker

A serious fungal canker disease that affects members of the cypress family, particularly Oriental arborvitae. The disease causes elongated, flattened cankers that can girdle branches and stems, leading to dieback and potential tree death.

Identify & Treat →
Armillaria root rot showing characteristic mushrooms and root damage
URGENT

Armillaria Root Rot

A widespread fungal root disease attacking most tree species worldwide. Often associated with stressed trees, it spreads through root contact and can survive for decades in infected stumps. The disease causes gradual decline and can predispose trees to bark beetle infestation.

Identify & Treat →
Ash yellows symptoms showing characteristic crown dieback and yellowing foliage
URGENT

Ash Yellows

A phytoplasma disease that affects ash species throughout northeastern and midwestern North America. The disease causes progressive decline with reduced growth, abnormal branching patterns, and eventual tree death.

Identify & Treat →
Asian Cycad Scale infestation showing characteristic white waxy covering
URGENT

Asian Cycad Scale

An exotic invasive armored scale insect that forms devastatingly dense populations on cycad plants. The scale creates white coverings that can completely coat plants, appearing like snow. Unique among scales for its ability to infest both foliage and root systems.

Identify & Treat →

Browse Problems by Type

Comprehensive database organized by problem category to help you quickly identify and treat tree health issues

Pest Problems

Insects and other pests that damage trees

78
Problems Identified

Disease Problems

Fungal, bacterial, and viral diseases

70
Problems Identified

Nutrient Disorders

Deficiencies and environmental stress

6
Problems Identified

Pest Problems (78)

Adelgids showing characteristic galls and woolly masses

Adelgids

medium
Ambrosia beetles showing characteristic boring patterns and gallery damage

Ambrosia Beetles (Including PSHB)

high
American Plum Borer damage showing characteristic galleries and exit holes

American Plum Borer

high
Aphid colony showing characteristic clustering and honeydew production

Aphids

medium
Asian Cycad Scale infestation showing characteristic white waxy covering

Asian Cycad Scale

high
Longhorned beetle showing characteristic features similar to Asian longhorned beetle with long antennae and wood-boring damage

Asian Longhorned Beetle

high
Birch leaf miner damage showing characteristic leaf mining patterns and browning

Birch Leaf Miner

medium
Black turpentine beetles showing characteristic attacks on pine trees

Black Turpentine Beetle

medium
Black Vine Weevil adult and larval damage on yew and other plants

Black Vine Weevil

high
Black vine weevil larvae and adult damage

Black Vine Weevil Adult

medium
Black vine weevil adult and larvae

Black Vine Weevil Larvae

high
Bronze Birch Borer damage showing characteristic galleries and exit holes

Bronze Birch Borer

high
California oakworm larvae

California Oakworm

high
California tent caterpillar larvae and tent

California Tent Caterpillar

low
Cedar bark beetle damage

Cedar Bark Beetles

medium
Citrus longhorned beetle adult and damage

Citrus Longhorned Beetle

high
Mealybugs showing characteristic white waxy coating and egg masses

Citrus Mealybug

medium
Clearwing borer showing typical boring damage and exit holes in tree bark

Clearwing Borers

medium
Cottonwood longhorned borer adult and damage

Cottonwood Longhorned Borer

medium
Cynipid gall wasp galls on oak showing various spherical and specialized forms

Cynipid Gall Wasps

low
Cypress bark beetle damage showing characteristic galleries and pitch tubes on conifer bark

Cypress Bark Beetle

medium
Dogwood twig borer showing characteristic boring damage and exit holes in dogwood twigs

Dogwood Twig Borer

medium
Douglas fir cone moth showing adult moth and larval damage to cone scales

Douglas Fir Cone Moth

medium
Douglas fir cone moth larvae showing tunneling damage and resinous cocoons in cone scales

Douglas Fir Cone Moth Larvae

medium
Douglas fir gall midge showing characteristic needle galls and orange larvae

Douglas Fir Gall Midge

high
Eastern Tent Caterpillar showing characteristic tent webs and larvae

Eastern Tent Caterpillar

medium
Elm Leaf Beetle adults and larvae feeding damage on elm leaves

Elm Leaf Beetle

high
Emerald Ash Borer adult beetle and characteristic D-shaped exit holes

Emerald Ash Borer

high
Engraver beetles showing characteristic boring damage patterns and gallery formation typical of bark beetles

Engraver Beetles (Pine Bark Beetles)

high
Eucalyptus longhorned borer showing characteristic features of longhorned beetles with long antennae and wood-boring damage

Eucalyptus Longhorned Borer

high
Elm scale insects showing characteristic scale coverings on elm bark and branches

European Elm Scale

medium
European pine sawfly larvae showing characteristic feeding damage on pine needles

European Pine Sawfly

high
Fall Web Worm nests showing characteristic terminal webbing

Fall Web Worm

medium
Flatheaded borer damage showing characteristic galleries and emergence holes

Flatheaded Borer

high
Gouty gall wasp damage showing characteristic large woody galls on oak

Gouty Gall Wasps

medium
Gypsy moth caterpillars showing characteristic hairy appearance and defoliation

Gypsy Moth

high
Nipple gall psyllid showing characteristic nipple-shaped galls on hackberry leaves

Hackberry Nipple Gall Psyllid

low
Psyllid galls showing characteristic abnormal growths and small jumping insects typical of hackberry psyllid infestations

Hackberry Psyllid

medium
Hemlock Woolly Adelgid showing characteristic white woolly masses

Hemlock Woolly Adelgid

high
Japanese Beetle adult showing characteristic metallic green body and copper wing covers

Japanese Beetle

high
Juniper bark beetles showing characteristic galleries and emergence holes in juniper bark

Juniper Bark Beetles

high
Lace bugs showing characteristic lace-like wing patterns and feeding damage

Lacebugs

medium
Leaf miner damage showing characteristic mining patterns and browning in leaves

Leaf Miners

medium
Leafhoppers showing characteristic wedge-shaped insects and feeding damage

Leafhoppers

medium
Lepidoptera insects showing various moths and caterpillars affecting trees

Lepidoptera (Moths and Butterflies)

medium
Lerp psyllids showing characteristic white lerp covers on eucalyptus leaves

Lerp Psyllids

medium
Lesser peach tree borer showing clearwing adult moth and characteristic bark damage

Lesser Peach Tree Borer

medium
Mimosa webworm larvae and webbing damage on mimosa tree foliage

Mimosa Webworm

medium
Mountain pine beetle damage and pitch tubes

Mountain Pine Beetles

high
Nantucket pine tip moth damage showing characteristic tip browning and larval tunneling

Nantucket Pine Tip Moths

medium
Oak gall wasp galls showing large, round formations on oak leaves and twigs

Oak Gall Wasp

low
Obscure scale infestation showing clustered gray to tawny scales on tree bark

Obscure Scale

medium
Pine bark beetles showing characteristic small beetles and boring damage patterns in pine bark

Pine Bark Beetles

high
Pine engraver beetles showing characteristic bark boring damage and beetle features similar to mountain pine beetle

Pine Engraver Beetles

high
Pine needle scale insects showing characteristic white scale coverings on pine needles

Pine Needle Scale

medium
Pine tent caterpillars in characteristic tent-like nest in pine tree

Pine Tent Caterpillars

high
Pine tip moth larvae damage showing dead terminal tips

Pine Tip Moth Larvae

medium
Pit scale insects in characteristic sunken pits on oak bark

Pit Scale

medium
Psyllid adults and galls on plant leaves

Psyllids

medium
Red turpentine beetle and characteristic pitch tubes on pine bark

Red Turpentine Beetles

high
Redwood bark beetle showing characteristic gallery patterns and bark damage on conifer trees

Redwood Bark Beetles

high
Roundheaded borer adult beetles and characteristic tunneling damage in tree bark

Roundheaded Borers (Excluding Asian Longhorn Beetles)

medium
Royal palm bug showing characteristic lace-like wing patterns and feeding damage

Royal Palm Bug

low
Rugose spiraling whitefly showing characteristic white waxy secretions and feeding damage

Rugose Spiraling Whitefly

medium
Sawfly larvae feeding on pine needles showing characteristic defoliation patterns

Sawfly

medium
Scale insect infestation showing characteristic oval brown scales on bark

Scale Insects

medium
Southern pine beetle and characteristic S-shaped galleries

Southern Pine Beetle

high
Spider mite damage showing characteristic stippling and discoloration on broadleaf plants

Spider Mites

medium
Spittlebug showing characteristic foam masses and feeding damage

Spittlebug (Froghopper)

medium
Spotted lanternfly adult showing characteristic grey wings with black spots

Spotted Lanternfly

high
Spruce budworm larva feeding on spruce needles

Spruce Budworm

high
Sycamore borer larvae showing characteristic tunneling damage in sycamore bark

Sycamore Borer

medium
Sycamore lace bug adults and nymphs feeding on leaf underside

Sycamore Lace Bug

medium
Thrips damage showing characteristic stippling on leaf surface

Thrips

medium
Western pine beetle galleries showing characteristic winding pattern under bark

Western Pine Beetles

high
Western spruce budworm larvae feeding damage on conifer needles

Western Spruce Budworm

high
Whiteflies on plant leaf underside with characteristic white waxy appearance

Whiteflies

medium
Winter moth larva showing characteristic pale green color with white stripes

Winter Moth (Operophtera brumata)

high

Disease Problems (70)

Ceratocystis canker showing characteristic dark, sunken lesions and vascular staining in alder tree tissue

Alder Ceratocystis Canker

medium
Anthracnose damage on sycamore showing characteristic leaf necrosis along veins

Anthracnose

medium
Apple scab fungal lesions on leaves showing characteristic dark spots

Apple Scab

medium
Arborvitae branch canker showing characteristic browning and canker formation

Arborvitae Branch Canker

high
Armillaria root rot showing characteristic mushrooms and root damage

Armillaria Root Rot

high
Ash yellows symptoms showing characteristic crown dieback and yellowing foliage

Ash Yellows

high
Bacterial blight symptoms showing wilting and browning of leaves

Bacterial Blight

medium
Bacterial leaf scorch showing marginal browning and yellowing

Bacterial Leaf Scorch

high
Birch melanconium dieback showing characteristic branch death and canker symptoms

Birch Melanconium Dieback

high
Botryodiplodia canker showing characteristic cankers and dieback

Botryodiplodia and Oak Decline Complex

high
Botryosphaeria canker symptoms

Botryosphaeria Branch Canker

high
Cedar branch canker symptoms

Cedar Branch Canker

high
Cedar coryneum blight symptoms

Cedar Coryneum Blight

medium
Elm vascular wilt symptoms

Cephalosporium Ulmi (Dothiorella Ulmi)

medium
Ceratocystis canker symptoms

Ceratocystis Canker

high
Oak wilt symptoms

Ceratocystis Dieback (Oak Wilt)

high
Oak wilt disease symptoms

Ceratocystis Fagacearum (Oak Wilt)

high
Dutch Elm Disease symptoms

Ceratocystis Ulmi (Dutch Elm Disease)

high
Coryneum blight showing characteristic shot-hole symptoms on leaves

Coryneum Blight

high
Coryneum canker showing characteristic twig dieback and lesion formation

Coryneum Canker

medium
Crab apple scab showing characteristic olive-green lesions and leaf spots

Crab Apple Scab

medium
Cypress cedar branch canker showing yellowing foliage and branch dieback

Cypress Cedar Branch Canker

high
Cytospora canker showing characteristic branch canker symptoms and bark discoloration

Cytospora Canker

high
Diplocarpon theumenii causing hawthorn leaf spot with characteristic red spots and maroon blotches

Diplocarpon Theumenii (Hawthorn Leaf Spot)

medium
Diplodia tip blight showing browning needles and cankers on pine

Diplodia Tip Blight

medium
Dothiorella (elm wilt) showing characteristic yellowing foliage and vascular discoloration

Dothiorella (Elm Wilt)

medium
Douglas fir Phomopsis canker showing characteristic narrow girdling lesions and branch dieback

Douglas Fir Phomopsis Canker

medium
Phomopsis canker showing characteristic branch browning and dieback

Douglas Fir Phomopsis Canker

medium
Dutch Elm Disease symptoms showing characteristic wilting and browning

Dutch Elm Disease

high
Elm dieback showing characteristic branch death and canker symptoms

Elm Dieback (Vermicularia)

low
Elm Phloem Necrosis showing characteristic yellowing and wilting

Elm Phloem Necrosis (Elm Yellows)

high
Phloem necrosis showing characteristic yellowing and crown dieback

Elm Phloem Necrosis (Elm Yellows)

high
Elm wilt showing characteristic wilting and dieback symptoms

Elm Wilt

high
Fire blight damage showing characteristic blackened, burned appearance of infected shoots

Fire Blight

high
Fusarium subglutinans showing characteristic canker and wilting symptoms

Fusarium Pine Pathogen

high
Fusarium wilt showing characteristic wilting and vascular discoloration

Fusarium Wilt

high
Fusarium wilt symptoms

Fusarium Wilt

high
Fusarium wilt symptoms showing characteristic yellowing and wilting

Fusarium Wilt (Mimosa Wilt)

high
Hawthorn leaf spot showing characteristic dark spots and leaf damage

Hawthorn Leaf Spot

medium
Kabatina branch canker showing characteristic branch death and browning

Kabatina Branch Canker

medium
Leptographium canker showing characteristic root decline and canker symptoms in pine trees

Leptographium Canker (White Pine Root Decline)

high
Melanconium dieback symptoms on birch

Melanconium Dieback

medium
Fusarium perniciosum showing characteristic wilting and root damage

Mimosa Wilt

high
Nectria canker showing characteristic target-pattern lesions and branch damage

Nectria Canker

medium
Oak decline complex showing characteristic crown thinning, leaf discoloration, and branch dieback

Oak Decline Complex

high
Oak wilt showing characteristic half-leaf browning and vascular discoloration

Oak Wilt

high
Palm bud rot showing terminal bud death and crown decay symptoms

Palm Bud Rot

high
Penicillium vermoeseni infection showing characteristic fungal rot symptoms and tissue damage typical of this pathogen

Palm Bud Rot

high
Palm lethal yellows showing characteristic progressive frond yellowing and palm decline

Palm Lethal Yellows

high
Peach X disease symptoms showing characteristic decline and borer damage

Peach X-Disease

high
Oak wilt symptoms showing crown thinning and vascular damage typical of Oak Decline Complex diseases

Pestalotia (Oak Decline Complex)

high
Phomopsis blight showing characteristic browning and dieback in juniper

Phomopsis Blight

medium
Physalospora bleeding canker showing characteristic canker formation and bleeding symptoms typical of this fungal disease

Physalospora Bleeding Canker

medium
Phytophthora cactorum infection showing characteristic water-soaked lesions and tissue damage typical of this water mold pathogen

Phytophthora cactorum

high
Phytophthora cinnamomi infection showing characteristic root rot and crown damage typical of this water mold pathogen

Phytophthora cinnamomi

high
Phytophthora palmivora infection showing characteristic water-soaked lesions and tissue damage on palm tissue

Phytophthora palmivora

high
Phytophthora root rot showing characteristic root decay and canker symptoms

Phytophthora Root Rot

high
Phytophthora species showing characteristic water-soaked lesions and tissue damage typical of this water mold pathogen genus

Phytophthora spp.

high
Pine Atropellis canker showing characteristic diamond-shaped, resinous cankers on pine branch with needle flagging

Pine Atropellis Canker

high
Fusarium moniliforme showing characteristic wilting and yellowing symptoms

Pine Pitch Canker

high
Pine pitch canker showing characteristic resinous bleeding cankers and branch dieback on infected pine tree

Pine Pitch Canker

high
Pine pitch girdle disease showing pitch exudation on pine bark

Pine Pitch Girdle

high
Pine tree showing symptoms of pine wilt nematode disease

Pine Wilt Nematode

high
Palm tree showing symptoms of pink bud rot disease

Pink Bud Rot

medium
Plum leaf showing bacterial leaf scald symptoms with marginal browning

Plum Non-Bearing Leaf Scald

high
Redwood needles showing purple spots and branch canker symptoms

Redwood Branch Canker

medium
Oak tree showing symptoms of sudden oak death with crown dieback and bleeding cankers

Sudden Oak Death

high
Madrone tree showing symptoms of Thielaviopsis decline with yellowing foliage

Thielaviopsis Decline

high
Oak tree showing symptoms of decline complex with crown thinning

Verticicladiella (Oak Decline Complex)

high
Tree showing verticillium wilt symptoms with characteristic one-sided wilting and crown dieback

Verticillium Wilt

high

Found Your Tree Problem?

Now discover proven Mauget treatment solutions designed specifically for each tree health issue. Our micro-injection system delivers targeted treatments directly where they're needed most.

Browse Treatment ProductsView Treatment Matrix