6o 



Others are the Mealy Bugs (Dactylopius) which may 

 occur on Roses under glass, have no scale at all. They 

 are active all their life. 



Scale insects are preyed upon by much the same 

 enemies as Aphides, especially lady-birds, chalcid flies 

 and birds, but none are equal to keeping them in check. 



The Scurvy Rose Scale (Diaspis rosce}. 

 This insect, often called the Scurvy Rose Bug, is 

 quite a common scale insect on wild Roses in the WevSt 

 of England, and I have found it on the Bramble. New- 

 stead, the chief authority on scale insects, says it oc- 

 curs freely on wild Roses in hedgerows and sheltered 

 places in many parts of England. No personal observa- 

 tions have been made on it in the open in Kent, Surrey 

 or Sussex, but some bad attacks have been seen under 

 glass. In Devonshire I have had it reported as very 

 harmful, and at Budleigh Salterton I found it killing 

 standards, owing to its great and rapid increase. It also 

 occurred on "ramblers" and Gloirede Dijon up a house in 

 such numbers that they were gradually dying back. The 

 Standards had even the buds attacked. 



Newstead says the scale insect will attack the leaves 

 under glass and in warmer climates than Britain in the 

 open. The disease can easily be told by comparing 

 it with the photo reproduced here, the curious white 

 scurvy-like patches being very marked. 



LIFE HISTORY AND HABITS. 



The female " scale " is at first pure white, with a 

 small yellow speck near the margin the cast larval skin. 

 In form, the "scale" is rounded and flat and rather 

 thick. 



