FOES AND FRIENDS OF THE PLANT 



191 



It may either be dug out with a knife, or killed with 

 carbon bisulphid, 

 which may be 

 poured around the 

 base of the trunk 



and COVeretl with FIG. 104. Worm (larva) of peach borer. (About 



earth. In either twice natural size.) 



case great care must be taken not to injure the tree (Cali- 

 fornia Experiment Station, Bulletin 143 ; New Mexico, 68.) 



Other borers which act in 

 the same way, but which de- 

 velop into beetles instead of 

 moths, are known to injure 

 fruit, forest, and shade trees. 

 The peach worm injures the peaches 



I<IG. 105. Pupa of a peach borer. 

 (About twice natural size.) 



The peach worm. 



in much the same way as the codling moth does the apple. 

 It attacks also apricots and 

 plums. Figure 106 shows how 

 it looks. 



In the fall the v^oungworms 

 bore into the bark, choosing 

 the crotches where the new 

 branches join the older sterns. 

 The worm lines its burrow 

 with a tube of silk which sticks 

 out as shown in figure 108. 

 This tube allows the worm 

 to breathe, but protects it 

 against the weather and also 

 against sprays. The tube is 

 covered with tiny crumbs of bark, 

 size, in figure 107. 



It may be checked by a spray of lime and sulphur, if 



FIG. 106. Peach worm. (About 

 one half natural size.) 



It is shown, natural 



