Pulvinaria innumerabilis (Rathvon)
COTTONY MAPLE SCALE

Hosts: Silver maple, honeylocust, hackberry, linden and other hardwoods.

Cottony maple scale is one of the largest and the most conspicuous scale insect that occurs in the region. Adult females may swell to over 1/4 inch diameter when producing a large cottony egg sack. Adults and nymphs feed on plant sap of twigs and leaves, respectively.

Cottony maple scale also excretes honeydew as it feeds.

The cottony maple scale spends the winter as adult, mated females on twigs and branches. During winter they appear as small, indistinguished dark lumps but begin to grow rapidly when they resume feeding in spring. A very large, wax-covered egg sack is ultimately produced by late spring, somewhat of the appearance of a marshmallow, and may contain over a thousand eggs. Eggs hatch from late June through July and the newly hatched crawlers settle on the undersides of leaves, usually near the midrib. During this leaf-feeding stage the nymphs are flattened with oval form and nearly translucent.

Nymphs feed on leaves until late summer, migrating to twigs and small branches before leaves drop. They then molt for the last time, after which the females remain in place for the rest of their lives. Males are produced at this time which are mobile and mate with the females, dying afterwards. There is one generation per year.

Neopulvinaria innumerabilis innumerabilis (Rathvon, 1854)
cottony maple scale

Coccus innumerabilis Rathvon 1854: 256. Type data: U.S.A.: Pennsylvania, Lancaster County, on Siver Maple and Linden trees
Lecanium acericorticis Fitch 1861: 775. Type data: U.S.A.: New York, Salem, west border of Jarvis Martin's woods, on maple
Lecanium acerella Rathvon 1876: 101. Type data: U.S.A.: Pennsylvania, Lancaster County, on maple [=Acer] branches
Pulvinaria innumerabilis (Rathvon, 1854); Putnam 1880: 293. change of combination
Pulvinaria tinsleyi King 1900d: 360. Type data: U.S.A.: New Mexico, near Roswell, on Celtis sp.
Neopulvinaria imeretina Hadzibejli 1955: 233. Type data: REPUBLIC OF GEORGIA
Neopulvinaria innumerabilis (Rathvon, 1854); Hodgson 1994a: 402. change of combination
Neopulvinaria inumerabilis (Rathvon, 1854); Dervišević, et al. 2021: 1. misspelling of species epithet

Hosts: [many other plants in other genera] Acer negundo, nigrum, platanoides, rubrum, saccharinum

Range: British Columbia, Ontario, Quebec, AZ, AR, CA, CO, FL, GA, IL, IN, LA, MS, NJ, NM, NY, OR, PA, RI, TN, TX, UT, VT, VA, WA, WI