INSECT ATTACKS AND REMEDIES 131 



of resin, such as have become a prey of the 

 pine beetle ; only in the latter case it is the 

 fresh young shoot and not the bud that is 

 attacked. The Retinia would seem, from notes 

 and observations, to be most abundant in what 

 might be termed neglected fir plantations, that 

 is, where the trees have suffered from over- 

 crowding, and if growing under unfavourable 

 conditions as to soil, etc., and particularly when 

 the wood is composed entirely of one species. 

 There is no method of dealing with large 

 infested areas, for the attacked trees have re- 

 peatedly been cut over and removed without 

 any seeming diminution in the numbers of the 

 insect. One experiment with a small infested 

 area has been rewarded with good results by 

 lighting a fire to windward, and causing the 

 smoke of coal-tar to pass amongst the trees. 

 This might be worth trying in the case of 

 fruit trees infested by particular insects. 



The Larch Miner (Tinea (Coleophora) I ar ice I la). 

 Few, other than those specially interested in 

 tree diseases, have the remotest idea that the 

 yellow, withered appearance of many of our 

 English larch plantations is due to the larvz 



