58 CURRANT. 



be fairly carried out of the place ; but care must be taken 

 that the cocoons are destroyed, or otherwise the sawflies that 

 hatch out of them will fly back to the trees and begin the 

 attack over again. AVhere this plan is carefully carried out, 

 there will be little damage to be expected from recurrence of 

 attack. 



But though many kinds of dressings and elaborate care in 

 their application are recommended by various writers, I have 

 found in my own personal experience that a good dressing of 

 lime and soot well mixed up together and liberally applied 

 answered every purpose, and a thorough washing down of the 

 leafage on the following day, so as to clean off the adhering 

 coating, was all that was needed to complete the work. 



CUREANT. 



Currant Aphis oi- Green Fly. Aphis ribis, Linn. 



Currant Aj^hides, or " Green Fly," are injurious by 

 crowding beneath the under side of the leafage, and b}- their 

 innumerable punctures and drawing away of the sap giving 

 rise to the brightly-coloured blistered or lumpy growths so 

 often seen on the upper side of the leaves of Currants. These 

 blisters may be red, or brown, or orange in colour, and are 

 convex on the upper side of the leaf, and concave below, thus 

 forming hollows, in which the aphides shelter themselves in 

 great numbers, and in bad attack the whole of the leaf may 

 probably be distorted and crumpled out of shape. 



The attack may be found from April onwards during the 

 summer months, and affects both Eed and Black Currants. 

 Often it is of little importance, but where the " Green Fly " 

 is very numerous, the leaves may be so much injured as to 

 cause the fruit to be blighted. 



By many writers the infestation is simply known as that 

 of A2)liis ribis, Linn., but consequently on a slight difference 

 in some of the structural characteristics, the aphides are now 

 (when minutely considered) separated accordingly as belonging 

 to two distinct genera, — the genus Rhopalosiphum of Koch, 

 and the genus Myzus of Passerini. The chief point of these 

 differences appears to be that whilst in the case of Rhojmlo- 

 siphum the tubercles on the forehead "are small or incon- 



