Moths of Europe Volume 1 Patrice Leraut Britain's Day-flying Moths David Newland, Robert Still and Andy Swash Colour Identification Guide to Caterpillars Jim Porter 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. These caterpillars should not be confused with the webbing caused by box tree caterpillar, cotoneaster webbers, brown tail moth or oak processionary moth. 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. May. The sedum small ermine can have two generations a year with active caterpillars in June-July and September-October. Never recorded on oak. The adult moths fly later in summer and all look superficially similar, being white or greyish with many small black dots, hence the ermine name. Certain members of the unrelated snout moths (Pyralidae) are also known as "ermine moths." 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 caterpillars of the Bird-Cherry Ermine Moth (Latin: Yponomeuta evonymellus) cover a tree in a communal silk web. 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. Other hairy caterpillar can be seen in the Hairy caterpillar gallery and British moth caterpillar gallery It is showing up in some U.S. states, primarily in the Great Lakes region. A caterpillar of the spindle ermine moth (Yponomeuta cagnagella) crawling along a grass blade at Bexley, Kent. 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. The very hungry caterpillars giving Northamptonshire's countryside a spooky look ... belong to a group of insects called Small Ermine moths. Spilosoma lubricipeda is an unrelated moth with the common name "white ermine.". The colour of the dorsal line of the fully grown caterpillar may be either red, orange or quite pale. The shrub normally recovers from this mass defoliation. 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. The caterpillars pupate within the webbing. The nonnative euonymus caterpillar moth, or spindle ermine (Yponomeuta cagnagella), has been introduced to North America from Europe. The sedum small ermine (Y. sedella) can have 2 generations per year, the caterpillars being active June-July and September-October. Tracy Adams, farm conservation officer, said: “These sinister webs are spun by the larvae of the ermine moth as they feed. In June-July and September-October U.S. states, primarily in the Great Lakes region ermine. 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