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INVASIVE SPECIES - A-Z
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Slender False Brome
Brachypodium sylvaticum
Slender false brome is a perennial grass that grows in dense clumps. This species has long, drooping, bright green leaves 5-12 mm wide, which can be covered in long, sparse hairs or may be hairless.
Spiny Waterflea
Bythotrephes cederstroemi
Spiny waterfleas are tiny crustaceans less than 1/2" long with long, sharp, barbed tails. Spiny waterfleas collect in gelatinous globs on fishing equipment and lines.
Spotted Knapweed
Centaurea stoebe
Spotted knapweed is an herbaceous biennial, although it may live for up to nine years. In its first year it grows in a basal rosette with 6-8” leaves. In every year after that, it can grow up to 3 ft. tall with flowers growing at the ends of its many branching stems.
Spotted Lanternfly
Lycorma delicatula
Spotted lanternfly has been found in western New York, in the Buffalo area. The Department of Agriculture and Markets is asking for the public's assistance by reporting sightings.
Spotted Wing Drosophila
Drosophila suzukii
Spotted wing drosophila (SWD), Drosophila suzukii, is an insect pest of economically valuable small fruit and tree fruit crops. Known in Oregon and the Pacific Northwest since about 2009, this species now appears to be established in many fruit growing regions around the country. Growers and researchers are working together to implement effective pest control strategies.
Starry Stonewort
Nitellopsis obtusa
Starry stonewort looks like a rooted plant, but is actually an algae related to the native Chara. It can form dense mats on the lake bottom, and has long, uneven-length, gelatinous branches that look angular at each joint. It may also have one cream colored bulb at the base of each branch cluster.
Swallow-worts
Cynanchum spp.
Pale and black swallow-worts are herbaceous, perennial, twining vines. Pale swallow-wort (Cynanchum rossicum) has small maroon to pale pink flowers with 5 hairless, triangular petals that are twice as long as they are wide. Black swallow-wort (Cynanchum louiseae) has small dark purple flowers with 5 pointed, downy, triangular petals that are the same length as their width. Pods split open, releasing innumerable downy seeds that are easily carried miles by wind.
Swede Midge
Contarinia nasturtii
Swede midges are small, light brown flies. They begin to emerge in May, lasting until mid-June. The adult females lay about 100 eggs throughout their short lifetime of 1-4 days.
