APPLE INSECTS— BUDS AND FOLIAGE 



125 



and sparsely clothed with rather long whitish hairs. The 

 caterpillars always feed in colonies and soon strip a branch 

 of its leaves. When disturbed they have the curious habit 

 of bending back the front part of the body 

 with a jerky motion and at the same time elevat- 

 ing the hind end of the body as shown in Figure 

 135. They become full-grown in August and 

 September, and enter the ground for a few inches 

 and there transform to brownish pupae (Fig. 137) a 

 little less than an inch in length, without forming 

 coccons. There is only one l)rood annually. 



Co7itrol. 



The work of these caterpillars is so conspicuous 

 that it is easy to locate them. On small trees it 

 is perfectly practicable to shake them off and crush 

 them on the ground. On larger trees the young 

 caterpillars can be killed by spraying with arse- 

 nate of lead, 4 or 5 pounds in 100 gallons of water. 



Fig. 137.— 

 Pupa of the 

 yellow - necked 

 apple cater- 

 pillar. En- 

 larged. 



References 



Beutenmiiller, Can. Ent. XX, pp. 16-17. 1888. 

 N. H. Agr. Exp. Sta. Bull. 139, pp. 213-215. 1908. 



The Red-humped Apple Caterpillar 

 Schizura concinna Smith and Abbot 



Feeding in colonies at the ends of the branches like the pre- 

 ceding species the red-humped apple caterpillar often attracts 

 attention in August and September. It is rarely a serious 

 pest on older trees but the caterpillars sometimes defoliate 

 young trees in August and thus prevent the ]:)roper ripening of 

 the wood. It attacks apple, cherry, plum, apricot, pear, black- 

 berry and a number of forest trees. 



In the Northern states the inconspicuous grayish-brown 



