128 GARDEN FOES. 



ried by the pruning-knife or implements. Everything 

 points to the infection being generally conveyed by air- 

 borne spores of the fungus gaining an entry into healthy 

 trees through some chance wound. Apparently only in 

 very exceptional cases do trees recover after being once 

 attacked, and the experimenters have no remedy to offer 

 so far. It may here be mentioned, though, that Mr. 

 Duncan, of Canterbury, reports that: "Having made a 

 hole in the earth, about four inches in depth and a yard 

 in diameter, around the trunk of the tree, he sprinkled one 

 pound of the ordinary, or commercial, isulphate of iron 

 into it, and covered first with a layer of rotted manure 

 and then with earth. The tree was treated late in Novem- 

 ber after the sap had ceased to flow, and the spring I'ains 

 dissolving the dressing carried it in solution to the roots 

 before growth recommenced. The experiment proved suc- 

 cessful, as the tree bore well for two seasons, and has 

 since showed no traces of the disease." 



CHAPTER IX. 



RASPBERRY AND STRAWBERRY PESTS. 



A INSECTS. 



Raspberry Aphis (Si])fi()iu)])h(^i-a rubi).— This Aphis 

 attacks the ras})b-iry and blackberry, congregating on the 

 under surface of the leaves, sucking out the sap, an<l 

 causing them to curl. Another Aphis — Siphonophora 

 chelidonii — is addicted to the same fault, and both in some 

 seasons do serious injury. 



IIemedy. — Spray the canes with Quassia and Soft Soap 

 (Formula No. 14) directly the pest is observed on the 

 foliasje. 



