Insects, etc., Injurious to the Plum. 



387 



but from ]>ersoiial nli.servations it scums that wlieu mice a tree is 

 attacked it is dooinud, unless some treiitmeiit is adopted. 



Vnlike the ^Mirssel Scale, wluch is found in the e^n' stage under 

 the " scale " during the winter, the ( )yster-sliell Bark Louse occurs 

 in the immature male and female cmidition. 



On lifting up one of tlu' scales, say in Fel)ruary, (me can easily 

 remove with a piiu a small yellow hotly beneath the scale. This is 



the i'emale insect not yet mature. AVinged males appear in Ajird 

 and early ;\Iay, and fl}' annuid the scale-laden trees. Tlie male is 

 yellow, with transpai'ent wings and a dusky band running across 

 tlie thorax from the liase of the wings. 



The females are tlien fertilised, and numerous eggs are laid, which 

 hatch into little active larva' in June, and they move over the tree. 

 These soon settle down, and the scale commences to form over them, 

 being quite prominent by October. 



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