Osea oe ie 
Courtesy Can. For. Serv., Can. 
Dep. Environ., Sault Ste. Marie, Ont. 
Figure 45.—Webs formed by the 
mimosa webworm, Homadaula 
anisocentra. 
F-519583 
Figure 44.—Defoliation by the juniper 
webworm, Dichomeris marginella. 
are formed in the webbing of infested trees. Second-generation adults appear during 
late July and early August and deposit their eggs on webs formed by first- 
generation larvae. In heavily infested areas, the larvae of this generation may 
completely defoliate their hosts. Some of the second-generation larvae pupate in 
cocoons spun in webs on trees, and the adults appear during the fall. Other larvae 
move to the soil or other protected places, pupate, and spend the winter (/276). 
The mimosa webworm 1s a serious defoliator of ornamental plantings of silktree 
and honeylocust. The thornless variety of honeylocust is heavily attacked 1n nurser- 
ies. Season-long protection against attack has been obtained by the use of systemic 
insecticides (3/9). 
139 
