TreeIssues

South Dakota

56 active alerts in this region

TreeIssues monitors plant and tree health threats across South Dakota. Below you will find current alerts for pests, diseases, fungi, and invasive species that have been detected in the state. Alerts are sourced from USDA, USFS, and South Dakota state agricultural agencies. Each alert includes severity ratings, affected species, symptoms, and recommended treatments.

Mountain Pine Beetle

CRITICAL
Insect

A native bark beetle responsible for massive die-offs of lodgepole, ponderosa, and whitebark pines across western North America. Climate change has expanded its range northward and to higher elevations. Outbreaks have affected tens of millions of acres.

Affecting 9 regions

Dutch Elm Disease

CRITICAL
Disease

A devastating vascular wilt disease spread by elm bark beetles that has killed millions of American elms since the 1930s. The fungus blocks water-conducting vessels, causing rapid wilting. It fundamentally changed the American urban landscape.

Affecting 45 regions

Rhizosphaera Needlecast

HIGH
Fungus

A common fungal disease of spruce trees, especially Colorado blue spruce, throughout the Midwest and Northeast. The fungus infects current-year needles through stomata, causing them to turn purple-brown and drop prematurely. Inner and lower branches are affected first because humidity is higher there, and the disease progresses upward and outward over successive years. Severely affected trees may retain only the current year's needles at branch tips.

Affecting 25 regions

Stigmina/SNEED Needlecast

HIGH
Fungus

A fungal disease of spruce very similar in appearance to Rhizosphaera needlecast but caused by a different fungus. Often occurs alongside Rhizosphaera. It has become increasingly recognized as a major cause of spruce needle loss, particularly on Colorado blue spruce. Diagnosis requires microscopic examination to distinguish from Rhizosphaera.

Affecting 20 regions

Cytospora Canker

HIGH
Fungus

A common fungal disease of spruce and other conifers that causes branch dieback, typically starting from the lowest branches and progressing upward. Colorado blue spruce and Norway spruce are especially susceptible. The fungus enters through wounds or stressed tissue. White resin bleeding on bark is a hallmark sign. Stressed trees are most vulnerable.

Affecting 25 regions

Bronze Birch Borer

HIGH
Insect

A native North American wood-boring beetle that attacks birch trees, especially paper birch and European white birch in landscape settings. Larvae feed under the bark in a serpentine pattern, disrupting nutrient and water transport. Dieback starts at the top of the crown and progresses downward, the opposite pattern of many other pests.

Affecting 26 regions

Emerald Ash Borer

MODERATE
Insect

An invasive wood-boring beetle native to Asia that has killed hundreds of millions of ash trees across North America since its discovery in Michigan in 2002. Larvae feed on the inner bark, disrupting nutrient and water transport.

Affecting 36 regions

Japanese Beetle

MODERATE
Insect

An invasive beetle introduced to New Jersey in 1916. Adults skeletonize leaves of over 300 plant species while larvae (grubs) damage turf grass roots. They are particularly damaging to linden, birch, and fruit trees.

Affecting 35 regions

Asian Longhorned Beetle Damages hardwood trees by tunneling deep into trunks and branches

MODERATE
Insect

Asian Longhorned Beetle Damages hardwood trees by tunneling deep into trunks and branches - identified by USDA APHIS as a pest threat.

Affecting 50 regions

Cyclocephala lurida lurida

MODERATE
Insect

Cyclocephala lurida lurida observed in the wild. Research-grade iNaturalist observation.

Affecting 20 regions

Chickweed Geometer Moth

MODERATE
Insect

Flew into garage after dark when we were organizing. Rescued to the outside. Stunning moth!

Affecting 20 regions

Two-spotted Grass Bug

MODERATE
Insect

Two-spotted Grass Bug observed in the wild. Research-grade iNaturalist observation.

Affecting 7 regions

Rhynocoris ventralis

MODERATE
Insect

Rhynocoris ventralis observed in the wild. Research-grade iNaturalist observation.

Affecting 3 regions

Southern Masked Chafer

MODERATE
Insect

Attracted to light at night. The plant on which the insect is resting (sweet Joe Pye weed) is located beside an exterior light that was illuminated.

Affecting 33 regions

Virgin Moth

MODERATE
Insect

Virgin Moth observed in the wild. Research-grade iNaturalist observation.

Affecting 2 regions

Phyllophaga crenulata

MODERATE
Insect

Phyllophaga crenulata observed in the wild. Research-grade iNaturalist observation.

Affecting 1 region

Saw-wing

MODERATE
Insect

Saw-wing observed in the wild. Research-grade iNaturalist observation.

Affecting 3 regions

Large Lace-border Moth

MODERATE
Insect

Large Lace-border Moth observed in the wild. Research-grade iNaturalist observation.

Affecting 13 regions

American Lappet Moth

MODERATE
Insect

American Lappet Moth observed in the wild. Research-grade iNaturalist observation.

Affecting 3 regions

Painted Lichen Moth

MODERATE
Insect

Painted Lichen Moth observed in the wild. Research-grade iNaturalist observation.

Affecting 17 regions

Waved Sphinx

MODERATE
Insect

Waved Sphinx observed in the wild. Research-grade iNaturalist observation.

Affecting 24 regions

Confused Eusarca Moth

MODERATE
Insect

Confused Eusarca Moth observed in the wild. Research-grade iNaturalist observation.

Affecting 8 regions

Black-rimmed Prominent

MODERATE
Insect

Black-rimmed Prominent observed in the wild. Research-grade iNaturalist observation.

Affecting 4 regions

Relict Rhinoceros Beetle

MODERATE
Insect

Relict Rhinoceros Beetle observed in the wild. Research-grade iNaturalist observation.

Affecting 14 regions

Black-dotted Glyph

MODERATE
Insect

Black-dotted Glyph observed in the wild. Research-grade iNaturalist observation.

Affecting 5 regions

Thirteen-spotted Lady Beetle

MODERATE
Insect

Thirteen-spotted Lady Beetle observed in the wild. Research-grade iNaturalist observation.

Affecting 6 regions

Magdalen Underwing

MODERATE
Insect

Magdalen Underwing observed in the wild. Research-grade iNaturalist observation.

Affecting 1 region

Elm Sphinx

MODERATE
Insect

Elm Sphinx observed in the wild. Research-grade iNaturalist observation.

Affecting 7 regions

Acholla multispinosa

MODERATE
Insect

CV really likes this choice. Difficult to photograph. I have many more photos if needed please let me know!

Affecting 9 regions

Five-spotted Hawk Moth

MODERATE
Insect

Five-spotted Hawk Moth observed in the wild. Research-grade iNaturalist observation.

Affecting 6 regions

Modest Sphinx

MODERATE
Insect

Modest Sphinx observed in the wild. Research-grade iNaturalist observation.

Affecting 7 regions

Black Witch

MODERATE
Insect

Found trapped inside our screen porch at 10 pm. Took a photo then helped it get outside.

Affecting 12 regions

Betrothed Underwing

MODERATE
Insect

Betrothed Underwing observed in the wild. Research-grade iNaturalist observation.

Affecting 3 regions

Emerald-dusted Sallow

MODERATE
Insect

Emerald-dusted Sallow observed in the wild. Research-grade iNaturalist observation.

Affecting 1 region

Bristly Cutworm Moth

MODERATE
Insect

Bristly Cutworm Moth observed in the wild. Research-grade iNaturalist observation.

Affecting 10 regions

Scarlet-winged Lichen Moth

MODERATE
Insect

Scarlet-winged Lichen Moth observed in the wild. Research-grade iNaturalist observation.

Affecting 5 regions

Punctured Tiger Beetle

MODERATE
Insect

Punctured Tiger Beetle observed in the wild. Research-grade iNaturalist observation.

Affecting 27 regions

Plains Cicada

MODERATE
Insect

i first saw it around 7:30AM and took a pic at 6PM, so it's been dead all day

Affecting 4 regions

Eye-spotted Lady Beetle

MODERATE
Insect

Eye-spotted Lady Beetle observed in the wild. Research-grade iNaturalist observation.

Affecting 4 regions

Bicolored Pyrausta Moth

MODERATE
Insect

Bicolored Pyrausta Moth observed in the wild. Research-grade iNaturalist observation.

Affecting 12 regions

Orange Wing

MODERATE
Insect

Orange Wing observed in the wild. Research-grade iNaturalist observation.

Affecting 7 regions

Melissa Blue

MODERATE
Insect

Melissa Blue observed in the wild. Research-grade iNaturalist observation.

Affecting 1 region

Twice-stabbed Stink Bug

MODERATE
Insect

Twice-stabbed Stink Bug observed in the wild. Research-grade iNaturalist observation.

Affecting 20 regions

Seven-Spot Ladybird

MODERATE
Insect

Seven-Spot Ladybird observed in the wild. Research-grade iNaturalist observation.

Affecting 1 region

Tomentose Burying Beetle

MODERATE
Insect

Tomentose Burying Beetle observed in the wild. Research-grade iNaturalist observation.

Affecting 17 regions

Oblique-banded Leafroller Moth

MODERATE
Insect

Oblique-banded Leafroller Moth observed in the wild. Research-grade iNaturalist observation.

Affecting 4 regions

Spined Assassin Bug

MODERATE
Insect

Spined Assassin Bug observed in the wild. Research-grade iNaturalist observation.

Affecting 8 regions

Pink-spotted Hawkmoth

MODERATE
Insect

Pink-spotted Hawkmoth observed in the wild. Research-grade iNaturalist observation.

Affecting 10 regions

Small Milkweed Bug

MODERATE
Insect

Observed: Two milkweed bugs mating on a dried, and brown native milkweed plant. Logged as “Small Milkweed Bug” due to INaturalist’s recommendation Observed at 6:25 pm, approximately 40 minutes before sunset, in an east facing, fully shaded milkweed host garden on a dead browned native milkweed plant. When first observed, they were not responsive to my presence. At this time, I observed them moving together, secured by the end of their abdomens. They engaged in a movement that was similar to pl

Affecting 34 regions

Bronzed Tiger Beetle

MODERATE
Insect

Bronzed Tiger Beetle observed in the wild. Research-grade iNaturalist observation.

Affecting 4 regions

Monarch

MODERATE
Insect

Early was stationary on Lima bean leaf, then on this particular Zinnia flower, nectaring, for a long while. Lots of Common and Butterfly milkweed flowers nearby but went for this zinnia.

Affecting 32 regions

Large Milkweed Bug

MODERATE
Insect

Cluster of black and orange insects on milkweed plant. Warm, near sunset, slightly overcast.

Affecting 35 regions

Black Swallowtail

MODERATE
Insect

Black Swallowtail observed in the wild. Research-grade iNaturalist observation.

Affecting 17 regions

White-lined Sphinx

MODERATE
Insect

Extremely friendly breezeway light visitor. I attempted to deposit it on nearby common evening primrose but it followed me back inside. Audio is the moth's wings.

Affecting 22 regions

Powdery Mildew

LOW
Fungus

A widespread group of fungal diseases that produce a distinctive white powdery coating on leaves and shoots. It affects hundreds of tree, shrub, and plant species. Unlike most fungi, it thrives in warm, dry conditions with high humidity.

Affecting 49 regions

Tar Spot

LOW
Fungus

A very common and distinctive fungal disease of maple leaves. The raised black spots are dramatic in appearance but the disease is almost entirely cosmetic and does not harm tree health. It is most severe in cool, wet years. The fungus overwinters in fallen leaves.

Affecting 22 regions

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