( 24: 



LIST OF IXSECTS, ETC., INJUEIOUS TO THE DAMSON. 



A. LEPIDOPTERA. 



Winter Moth {Cheimatobia hrumata). Foliage, p. 50. 

 March Moth {Anisopteryx (nscularia). Foliage, p. 61. 



B. HEMIPTEliA. 



Hop-Damson Aphis {Pltorodon liumuli v. malaheh. Fonsc). Foliage, 



p. 247. 

 Yellow Leaf Hopper (C/(/o)77«r;'/-ic?;??fi. Fall.). Foliage (vide Plum). 



C. ACARINA. 



Leaf Gall Mite (Erioj'^iycs jjadi. Nalepa). Rare on Damson. 

 Leafage, p. 2')4. 



THE HOP-DAMSON APHIS. 



[Phorodon hum nil var. innhiluh. Fonsc.) 



This aphis, which is so well known in hop districts, is not only 

 a serious pest of the hop grower, for the orchardist also suffers from 

 its ravages. 



The damson is frequently attacked to a serious extent, just at 

 the time it is in the most delicate stage, when the young leaves are 

 unfolding. 



LlFE-HlSTOKY AND H.VBITS. 



If we examine damsons in the orchards near hop gardens during 

 the months of November, December, January, February and March, 

 we sliall find in the forks of the buds and twigs small shiny black 

 eggs — the ova of this aphis. As many as ten may be crammed into 

 one axil. They are attached somewhat firmly to the rind, or even 

 to one another. In form they are spindle-shaped, slightly curved 

 beneath, with a comparatively soft shell of a shiny black colour, 

 and resemble other aphis eggs ; in fact, on the same trees, and 

 almost exactly alike, may now and then be found the ova of the 

 Plum Aphis (AjjJiis j^runi), but the latter are often deposited just 

 under the bud, whereas those of humuli are laid in the axils of the 



