1908.] Brown Scale of Gooseberry and Currant. 195 



Among the most susceptible varieties are the following : — 

 King of the Pippins, Cox's Pomona, Lord Grosvenor, Sumeld,. 

 Wellington, Ecklinville Seedling, Northern Greening, Yellow 

 Ingestre or Summer Pippin and (mainly as regards the leaves) 

 Bismarck. 



Among specially resistant varieties may be mentioned : — 

 Beauty of Bath, Bramley's Seedling, Newton Wonder, 

 Grenadier, Lord Derby, Lane's Prince Albert, Queen, The 

 Victorian, Golden Spire. 



In conclusion I should like to direct the earnest attention 

 of English fruit-growers to the fact now definitely proved 

 that apple " scab " or " black spot " can be perfectly 

 controlled by means of Bordeaux mixture. Orchards and 

 plantations which have been producing annually " scabby " 

 apples can at a slight cost be made to yield crops entirely free 

 from the disease. 



THE BROWN SCALE OF THE GOOSEBERRY AND 



CURRANT. 



Robert Newstead, A.L.S. 



School of Tropical Medicine, University of Liverpool. 



This insect (Lecanium persicae, var. ribis* Fitch) is found 

 in great abundance on the gooseberry, currant, rose, plum 

 and cotoneaster, but rarely on raspberry ; and it has also been 

 found on a variety of other cultivated and wild plants. 



It has a decided preference for the older branches, the young 

 shoots being attacked only when the insects become over- 

 crowded. 



It is very generally distributed throughout England, but 

 is less known in Wales, Scotland, and Ireland. Outside the 

 British Isles it is found in abundance in Germany, France ? 

 and Bohemia, and has occurred in some numbers in New 

 Zealand and Australia. If it can be proved that Fitch's 

 type is the same as the European forms, then it occurs also 

 in North America, into which country it may, in all probability, 

 have been introduced on imported plants. 



It is as a rule much more prolific on plants grown 



* This specific name is the one by which this insect is most generally known to 

 scientists and horticulturists in this country ; and it would be well if it could be 

 retained, as it is a much more appropriate one than sarot/iamni, which was given to it 

 by Douglas in 1891. 



N 2 



