The shrub normally recovers from this mass defoliation. The caterpillars pupate within the webbing. Certain members of the unrelated snout moths (Pyralidae) are also known as "ermine moths." It is showing up in some U.S. states, primarily in the Great Lakes region. The sedum small ermine can have two generations a year with active caterpillars in June-July and September-October. May. The nonnative euonymus caterpillar moth, or spindle ermine (Yponomeuta cagnagella), has been introduced to North America from Europe. Ermine Moth caterpillars Andy M noticed that the Spindle Trees were covered in webs this week, and that their leaves had been almost entirely consumed by Ermine Moth caterpillars, which were dropping themselves out of the trees on long strands of silk. The caterpillars of the Bird-Cherry Ermine Moth (Latin: Yponomeuta evonymellus) cover a tree in a communal silk web. Spilosoma lubricipeda is an unrelated moth with the common name "white ermine.". A caterpillar of the spindle ermine moth (Yponomeuta cagnagella) crawling along a grass blade at Bexley, Kent. Hosts: Different species of small ermine moths can be found on willow (Salix), hawthorn (Crataegus), cherry & blackthorn (Prunus), and some other fruit and ornamental trees. The White Ermine caterpillars grow to approximately 40 mm in length, feed on a wide variety of herbaceous plants and are very easy to rear. The very hungry caterpillars giving Northamptonshire's countryside a spooky look ... belong to a group of insects called Small Ermine moths. Never recorded on oak. This is one of four Ermine moth species, namely Orchard Ermine (Yponomeuta padella), Apple Ermine (Yponomeuta malinellus), Spindle Ermine (Yponomeuta cagnagella) and Willow Ermine (Yponomeuta rorrella) which should now be recorded as Yponomeuta agg., unless it is made clear that they were recorded as an occupied larval web or reared from the relevant larval foodplant. Other hairy caterpillar can be seen in the Hairy caterpillar gallery and British moth caterpillar gallery The sedum small ermine (Y. sedella) can have 2 generations per year, the caterpillars being active June-July and September-October. The family Yponomeutidae are known as the ermine moths, with several hundred species, most of them in the tropics.The larvae tend to form communal webs, and some are minor pests in agriculture, forestry, and horticulture. Ermine moth webs should not be confused with other web-forming larvae, which can be found around the same time, although these nests tend not to be so extensive and the caterpillars of most are hairy. These caterpillars should not be confused with the webbing caused by box tree caterpillar, cotoneaster webbers, brown tail moth or oak processionary moth. 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