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
CRITICALA 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
CRITICALA 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
HIGHA 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
HIGHA 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
HIGHA 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
HIGHA 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
MODERATEAn 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
MODERATEAn 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
MODERATEAsian 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
MODERATECyclocephala lurida lurida observed in the wild. Research-grade iNaturalist observation.
Affecting 20 regions
Chickweed Geometer Moth
MODERATEFlew into garage after dark when we were organizing. Rescued to the outside. Stunning moth!
Affecting 20 regions
Two-spotted Grass Bug
MODERATETwo-spotted Grass Bug observed in the wild. Research-grade iNaturalist observation.
Affecting 7 regions
Rhynocoris ventralis
MODERATERhynocoris ventralis observed in the wild. Research-grade iNaturalist observation.
Affecting 3 regions
Southern Masked Chafer
MODERATEAttracted 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
MODERATEVirgin Moth observed in the wild. Research-grade iNaturalist observation.
Affecting 2 regions
Phyllophaga crenulata
MODERATEPhyllophaga crenulata observed in the wild. Research-grade iNaturalist observation.
Affecting 1 region
Saw-wing
MODERATESaw-wing observed in the wild. Research-grade iNaturalist observation.
Affecting 3 regions
Large Lace-border Moth
MODERATELarge Lace-border Moth observed in the wild. Research-grade iNaturalist observation.
Affecting 13 regions
American Lappet Moth
MODERATEAmerican Lappet Moth observed in the wild. Research-grade iNaturalist observation.
Affecting 3 regions
Painted Lichen Moth
MODERATEPainted Lichen Moth observed in the wild. Research-grade iNaturalist observation.
Affecting 17 regions
Waved Sphinx
MODERATEWaved Sphinx observed in the wild. Research-grade iNaturalist observation.
Affecting 24 regions
Confused Eusarca Moth
MODERATEConfused Eusarca Moth observed in the wild. Research-grade iNaturalist observation.
Affecting 8 regions
Black-rimmed Prominent
MODERATEBlack-rimmed Prominent observed in the wild. Research-grade iNaturalist observation.
Affecting 4 regions
Relict Rhinoceros Beetle
MODERATERelict Rhinoceros Beetle observed in the wild. Research-grade iNaturalist observation.
Affecting 14 regions
Black-dotted Glyph
MODERATEBlack-dotted Glyph observed in the wild. Research-grade iNaturalist observation.
Affecting 5 regions
Thirteen-spotted Lady Beetle
MODERATEThirteen-spotted Lady Beetle observed in the wild. Research-grade iNaturalist observation.
Affecting 6 regions
Magdalen Underwing
MODERATEMagdalen Underwing observed in the wild. Research-grade iNaturalist observation.
Affecting 1 region
Elm Sphinx
MODERATEElm Sphinx observed in the wild. Research-grade iNaturalist observation.
Affecting 7 regions
Acholla multispinosa
MODERATECV 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
MODERATEFive-spotted Hawk Moth observed in the wild. Research-grade iNaturalist observation.
Affecting 6 regions
Modest Sphinx
MODERATEModest Sphinx observed in the wild. Research-grade iNaturalist observation.
Affecting 7 regions
Black Witch
MODERATEFound trapped inside our screen porch at 10 pm. Took a photo then helped it get outside.
Affecting 12 regions
Betrothed Underwing
MODERATEBetrothed Underwing observed in the wild. Research-grade iNaturalist observation.
Affecting 3 regions
Emerald-dusted Sallow
MODERATEEmerald-dusted Sallow observed in the wild. Research-grade iNaturalist observation.
Affecting 1 region
Bristly Cutworm Moth
MODERATEBristly Cutworm Moth observed in the wild. Research-grade iNaturalist observation.
Affecting 10 regions
Scarlet-winged Lichen Moth
MODERATEScarlet-winged Lichen Moth observed in the wild. Research-grade iNaturalist observation.
Affecting 5 regions
Punctured Tiger Beetle
MODERATEPunctured Tiger Beetle observed in the wild. Research-grade iNaturalist observation.
Affecting 27 regions
Plains Cicada
MODERATEi 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
MODERATEEye-spotted Lady Beetle observed in the wild. Research-grade iNaturalist observation.
Affecting 4 regions
Bicolored Pyrausta Moth
MODERATEBicolored Pyrausta Moth observed in the wild. Research-grade iNaturalist observation.
Affecting 12 regions
Orange Wing
MODERATEOrange Wing observed in the wild. Research-grade iNaturalist observation.
Affecting 7 regions
Melissa Blue
MODERATEMelissa Blue observed in the wild. Research-grade iNaturalist observation.
Affecting 1 region
Twice-stabbed Stink Bug
MODERATETwice-stabbed Stink Bug observed in the wild. Research-grade iNaturalist observation.
Affecting 20 regions
Seven-Spot Ladybird
MODERATESeven-Spot Ladybird observed in the wild. Research-grade iNaturalist observation.
Affecting 1 region
Tomentose Burying Beetle
MODERATETomentose Burying Beetle observed in the wild. Research-grade iNaturalist observation.
Affecting 17 regions
Oblique-banded Leafroller Moth
MODERATEOblique-banded Leafroller Moth observed in the wild. Research-grade iNaturalist observation.
Affecting 4 regions
Spined Assassin Bug
MODERATESpined Assassin Bug observed in the wild. Research-grade iNaturalist observation.
Affecting 8 regions
Pink-spotted Hawkmoth
MODERATEPink-spotted Hawkmoth observed in the wild. Research-grade iNaturalist observation.
Affecting 10 regions
Small Milkweed Bug
MODERATEObserved: 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
MODERATEBronzed Tiger Beetle observed in the wild. Research-grade iNaturalist observation.
Affecting 4 regions
Monarch
MODERATEEarly 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
MODERATECluster of black and orange insects on milkweed plant. Warm, near sunset, slightly overcast.
Affecting 35 regions
Black Swallowtail
MODERATEBlack Swallowtail observed in the wild. Research-grade iNaturalist observation.
Affecting 17 regions
White-lined Sphinx
MODERATEExtremely 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
LOWA 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
LOWA 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