Part VI. -FOREST TREE FOES. 



CHAPTEK I. 



INSECTS. 



Ash. bark Beetle (Hylesinus fraxini).— Both the 

 beetles and their larvae bore tunnels just beneath the bark 

 of ash trees, thus interfering with the circulation of the 

 sap, causing the bark to decay and the tree to eventually 

 die. The beetles are l-6in. long, blackish to ochreous in 

 colour, with red feet. The larvae are small, white, fleshy, 

 and legless, and furnished with strong jaws. The beetles 

 appear in April, and bore holes in the bark; then lay 

 their eggs, the larvne from which bore short tunnels at 

 right angles to the main tunnel on each side. In due 

 course the larviie turn into pupiie, and finally emerge as 

 beetles, eating their way out and riddling the bark with 

 holes. 



liEMEDiEs. — (1) Trees badly attacked should be cut down 

 and have the infested bark stripped off and burnt. (2) 

 In April and May paint the trunks with the remedy ad- 

 vised for the Fruit Tree Beetle on page 66. 



Ash-bark Scale (Chionaspis salicis, syn. A. fraxini). 

 — Although its common name is popularly associated with 

 the ash, this Scale insect really derives its specific name 

 from the willow. It is common on both trees, and is also 



