50 



Letters on the Diseases of Plants. 



in the preceding paragraphs. 



It is a waste o£ money and energy to apply 

 the wrong remedies. It 

 would be of little use, 

 for instance, to apply 

 fungicides to trees at- 

 tacked alone by the 

 cherry-tree borer, as in 

 the case of the front 

 tree in Fig. 59. On the 

 other hand, where the 

 trees are attacked by 

 dry-rot fungi, it would 

 be of little service to — 



1. Eemove from the 

 vicinity of the or- 

 chard, unless they 

 are serving some 

 useful purpose, all 

 sheoak, wattle, and 

 other native trees 

 that harbour the 

 cherry-tree borer. 



2. Spray the tree with 

 tar-water, or some 

 other substance 

 that will be so of- 

 fensive to the fe- 

 male moth that she 

 will decline to lay 

 her eggs there. 



3. Removeloosebark, 

 and whitewash the 

 trunk and main 

 branches, 



4. Squirt or otherwise 

 insert into all holes 

 and crevices to be 

 found, such liquids 

 as kerosene emul- 

 sion or phenyl. 



5. Set lighted lanterns 

 at night, in the pro- 

 per season, and so 

 arranged that the 

 attracted and dazed 

 moths will fly 

 against rags and 

 dangling strings 

 soaked in kerosene, 

 or against some 

 very sticky sur- 

 face, — 



for these remedies would be of little or no avail against the dry-rot fungi, 

 although effective as against the cherry-tree borer. 



Fig. 60.— ^garicMs 



dlciis, ouo of the Mushrooms whose mycelium 

 :e decay of trees. After Hartig. 



