136 



Wlu'iv these posts luivo lieeii iie.ijk'cted till they become mature, it may 

 become necessary to use the Paris f,'reen spray (N<i. it) to prevent them from 

 spreading. 



Forest Tent-Caterpillar (CU'<i(M-uiiiini siilratlca). 



(Fig. 41. j 



A near relation of the last-mentioned pest, and like it. widely distributed 

 an<l destructive, both in orchards and to forest trees, such as willows, maples, 

 Ijirches. etc., often completely defoUating considerable areas. They do not 

 spin such extensive webs as the preceding pest, and are great travellers 

 during t!ie latter part of the day, and often during the earlier iwrtion too ; 

 the,v collect on the trunks and larger branches of infested trees in large 

 masses : this habit can be taken advanta.ge of in destroying them, but it is 

 often ditlicult to protect orchard trees in the vicinity of infested forest areas. 

 Constant watchfulness is needed in such cases and the Paris green spra.v must 

 be used freely, combined with liand-picking and destruction of massed bodies 

 of the pests. 



Bri) JIOTH i'riiKiocird ovi-iIiiiki). 



^SS^ 



iFi.;. 4:;. I 

 The half-grown hwviv winter in inconspicuous temporary cocoons, which- 

 are usually secreted about the buds on the twigs and smaller branches. When 

 the buds begin to open in the spring the larva> leave their cocoons and attack 

 both leaf and fruit buds. During tlie day time the moths remain quietly 

 resting upon the trnuUs and larger branches of the tree, with their wings 

 folded roof-like over the back. In this position tlicy so closely resemble the 



