[Sei't., 



THE RASPBERRY GALL FLY. 



{Lasioptera Ruhi, Schrk.) 



Herbebt W. Miles, N.D.A., Dip. Agr. Hons. 

 (Harper- Adams.) 



This fly, which is one of the CecidomyidcE, causes galls on the 

 raspberry and blackberry, and is frequently met with in hedges 

 and occasionally in plantations. Theobald (Insect Pests of 

 Fruit, 1909), states : " It has seldom been brought to my notice 

 as occurring in any amount on raspberries, and can scarcely be 

 looked upon as a pest." In the Report on the Occurrence of 

 Insect Pests, issued by the Board of Agriculture in 1918, the 

 occurrence of abnormally large galls on the raspberry is men- 

 tioned, whilst in the Monthly Reports for January and February, 

 ]921, issued by the Ministry of Agriculture^ Theobald records 



Galls on Raspberry Canes. 



this pest as becoming increasingly injurious in Kent; it was 

 also observed in Somerset during the winter of 1920-21, when 

 the galls illustrated above were collected. 



The galls on the canes are observed most readily after the 

 leaves have fallen. They are located either at a node or in the 

 intemode, and measure from .59 in. to .79 in. (J in. to | in.) 

 in length and up to .59 in. (J in.) in width, and tend to be more 

 regular in outline than the galls on the blackberry. If the galls 



