37 





Figure 26. 



Fall Weij Worm. 

 a. b. c. differently marked larva:. d, e. Chrysalids. /. Moths, 

 i.s a yellow stripe along each side. 'J'he head is black and the legs 

 and underside of the body arc dark. There are twelve prondnen- 

 ces or tubercles on each segment, four black ones on the back and 

 four orange ones on each side. They feed on the elm, apple, pear, 

 cherry, walnut, willow, ash, etc. Toward fall they leave the 

 web and enter the ground where they change to chrysalids, figure 

 20, d. e. Of course the most thorough preventive measure in 

 this case is the prompt removal of the web and destruction of its 

 inmates as soon as it is formed, but it may be and often is over- 

 looked for a time ; yet even at the risk of mutilating the tree, there 

 is no better way nor any so good as cutting ofl' and burning the 

 twigs included in the web. The usual remedies for tent caterpillar, 

 burning, soaking with kerosene, are just as useful against this insect, 

 but nothing can take the place of watchfulness, and by reason of 

 this the speedy discovery of the web. Spraying with London pur- 

 ple has proved a cheap and ellective remedy, and is perhaps the 

 best when the worms have once gotten established upon a con- 

 siderable number of trees. 



