278 Wisconsin State Horticultural Society. 



very compactly and covering 1 them with varnish. These egg clus- 

 ters differ from those, of the orchard species in being usually larger 

 and in their terminating with an abrupt, scpjare shoulder, while 

 those of the other end with a regular curve. 



The same means mentioned above may be used for their destruc- 

 tion, though not with the same readiness or efficiency; owing to 

 their location on the high forest trees, the egg clusters and worms 

 in their earlier stages cannot be so easily reached, but their grega- 

 rious habits, and their torpid condition while moulting, furnish 

 good opportunities for their destruction in large numbers. Lights 

 at night, at the season when the moths appear, can be also used to 

 great advantage. 



Yellow Necked Apple Tree Caterpillar. 



Data?ia Manistra. — Drury. 



In some respects this insect resembles in its habits and modes of 

 life the tent caterpillars, and is sometimes mistaken for them by 

 those who are superficial in their observations. Yet it is of an en- 

 tirely different species, and while there area few things in common, 

 a slight examination will reveal a great dissimilarity between the 

 two. The eggs from which these worms hatch are laid in clusters 

 on the underside of the leaves at the extremity of the limbs, a 

 hundred or more in each cluster. They usually are first seen the 

 latter'part of July,but broods continue to hatch out during the month 

 of August, and even later in the season. At first they are less than a 

 cpuarter of an inch in length and feed side by side on the under 

 surface of the leaves, but as they increase in size they devour all 

 the leaf except the larger stems and ribs, working down the limb 

 on which they are located, making it completely bare. If seen in 

 the earliest stages of its development the whole brood may be re- 

 moved on a small twig and even on a single leaf. The first sign of 

 their presence is usually a bare limb here and there on the tree, 

 and often there is not a worm in sight, and the observer is led to 

 think that the destroyer has completed his work and gone, but a 

 closer look will reveal the brood gathered in a small clump on the 

 side of the tree, lying in a semi -torpid state; they have passed 

 through the first stage of their existence and come to the moulting 

 period; this passed, they engage in the work of destruction more 



