PEAR AND QUINCE INSE(JTS 2B3 



the hemlock, beech, birch, red oak, and among fruit trees the 

 pear, plum and apple, preferring the latter. 



The female beetle is dark brown, about | inch in length, 

 cylindrical and has the nearly globular head draWn under the 

 thorax so as to be invisible from al)<)ve. The males are only 

 a little more than half as long and have the back very convex 

 longitudinally. On small branches the female usually starts 

 her burrow just below a bud s(!ar and, after passing through the 

 sapwood tunnels around the pith, keeping in the hard wood, 

 constructs a number of side burrows running lengthwise 

 of the branch. In larger branches the galleries are straighter. 

 The eggs are laid loosely in the burrows in June in Nova Scotia 

 and in May in West Virginia, and the grubs feed on the fungus 

 growing on the walls of the chamber. The larvae pupate in 

 the galleries and the beetles escape through the entrance hole 

 made by the parent beetle. 



Treatment. 



So far this beetle has been troublesome only in restricted 

 localities and is not likely to become a serious pest. In Nova 

 Scotia a wash made of 3 gallons of water, 1 gallon soft soap and 

 J pint of carbolic acid has given good results when applied in 

 June. In using this wash the aim is to have the liquid soak 

 into the burrow, kill the food fungus and thus indirectly destroy 

 the beetles. Two or three applications at intervals of a few 

 days are advised. Badly infested trees or branches should be 

 burned before the beetles have a chance to emerge. 



References 



Peck, Mass. Agr. Jour. IV, pp. 205-207. 1817. 



Hubbard, Bur. Ent. Bull. 7, pp. 9-30. 1897. General account of the 



ambrosia beetles. 

 Fletcher, Rept. Ent. Bot. for 1904, pp. 240-241. 1905. 

 Swaine, Rept. Ent. Soc. Ont. for 1909, pp. 58-63. 1910. 

 Schneider-Orelli, Centlb. Bakt. Parasitenk. Infektk., 2 Abt., XXXVIII, 



pp. 25-110. 1913. Extensive account. 



