io8 



SPRAYING CROPS 



The twigs of deciduous and coniferous trees are 

 often infested during winter by small bags or sacs 

 (e) suspended from the leaves or branches. If one of 

 the larger of these bags bC cut open, there will be found 

 within it a brown, membranous shell (the pupa-case of 

 the moth) filled with many small, yellow eggs (e). In 

 this condition the BAG-WORM or BASKET-WORM passes 

 the winter. Late in spring the larvae hatch, and form 



Bag=worm 



a, larva; t>, male pupa; c, female moth; d t male moth; e, bag- and pupa- 

 case cut open to show eggs : _/, full-grown larva with bag; g, young larvae with 

 their conical coverings. (After Riley) 



little cases of fragments of leaves fastened together by 

 silken threads. Beneath these cases (g) they feed 

 upon the foliage, enlarging them as the larvae develop, 

 and during later life using bits of twigs or stems in 

 their construction. When fully developed, the worms 

 descend to the earth by means of silken threads, and 

 crawl about until they reach the bases of other trees, 

 which they ascend. This is the way the species 



