144 



Insect Pests. 



It is most abundant in Surrey. A correspondent, writing from 

 Woking, states that he is much troubled with it, and that he had 

 used lots of mixtures and kept brushing in summer, but without 

 success. Eecently I learn that this nurseryman is coping with the 

 root form. Numerous inquiries have come from Cambridgeshire, 

 Huntingdonshire, Norfolk, Suffolk, Cheshire, Yorkshire, Sussex, 

 Hampshire and Oxfordshire. In Wales I have found it in abundance 

 amongst young trees imported from the Midlands at Criccieth, also at 

 Carnarvon and Bangor ; in Monmouthshire it was noticed in some 



gardens. This record of locali- 

 ties could be still further 

 increased. 



Besides being known under 

 the popular name of Woolly 

 Aphis, it is frequently spoken 

 of as " American Blight." The 

 reason for this is ditticult to 

 understand, for it is undoubt- 

 edly European, and we are 

 also equally certain that it 

 was introduced into America, 

 just as it has been into Africa 

 and Australasia, with imported 

 stock. 



It attacks practically all 

 varieties of apples in this 

 country. In Australia (5 and 

 6) it is found that apples 

 grafted on Northern Spy and 

 Majetin stocks do not suffer 

 from the ground form, and 

 these are now solely used for 

 this purpose. Mr. Lounsbury, Government Biologist at the Cape, 

 tells me that no apples unless on these stocks are allowed to be 

 imported into Cape Colony, and that their immunity is found to be 

 the same there as elsewhere. The " May Apple " is also immune in 

 Cape Colony (9). This is a very important point. None of these 

 stocks are used in this country. Nurserymen whom I have spoken 

 to about the subject have expressed their opinions adversely, but 

 I am not aware that anyone has tried them in this country, and 

 until this is done 0]ie must naturally believe not only what such 

 great experts as Mr. French, the Government Entomologist of Victoria, 



[F. EdnKl^- 



FIG. 118.— WOOI.IA' APHIS AND GALLED AREA 

 PUODUCED BY IT. 



