Cryptorhynchus lapathi (Curculionidae)
Adults:Weevil with snout of medium length; elytral surface pitted and covered with tufts of dark and light flattened hairs.
Grubs:Curved, segmented legless grub.
Damage:Current attacks by larvae are indicated by irregular splits and holes in the bark of host trees through which sap and moist, red-brown and white boring dust exudes, and by piles of boring dust around stem bases. Stems honeycombed with darkened, weathered tunnels, and deformed from the callusing of injured areas, are indicative of past attack.
Because larvae of several other wood-boring insects attack the same hosts
and cause similar damage it is usually necessary to open damaged stems and
examine the occupants in order to make a positive identification.
Members of the genus
are the preferred hosts, although Populus, Alnus and
Betula species are recorded hosts.
Larvae are able to attack healthy willows, but poplars must be weakened by
transplanting, etc. It is a pest of ornamental trees and of trees planted
References and Links:
EAG: 527-528; FC: 321-322.
See HForest and JP17.