group of larvae of bird-cherry ermine yponomeuta evonymella pupate in tightly packed communal, white web on a tree trunk and

yponomeuta pest malinellus ermine colony caterpillar green tree agriculture hyponomeuta closeup parasite moth insect plant macro leaf nature wild summer butterfly garden wildlife larvae group larva bird cherry damage eat malinella europa worm branch cocoon apple forest metamorphosis prunus padus europe flora agricultural yellow natural beautiful growth yponomeutidae color animal disease