G EX ERA L PR A C TIC E. ENEMIES. 



27.1 



Mussel Scale affects the apple chiefly when grown in warm situations, as inclosed 

 gardens, against walls, and under glass. It is also very common on the pear in similar 

 situations. Indeed, Mussel Scale is widely distributed, prevailing in all countries where 

 apples and pears are grown and the insect has been introduced. It is easily distinguished 

 by its long, narrow form and dark brown colour. The Pear Oyster Scale (l)iaspis 



Fig. 80. MUSSEL SCALE (MYTILASPIS POJIOEUM) ON APPLE. 

 References: 1, female, enlarged : natural size on 

 right ; 2, female, under side, showing eggs, all greatly 

 magnified : natural size on left. F, apple branch 

 infested with Mussel Scale, natural size ; 3, weakened 

 growth and blossomless buds resulting from scale 

 infestation ; 4, clean growth with blossom buds ; 5, 

 infested apple ; 6, clean fruit. 



Fig. 81. WHITE PEAK SCALE (Aspioioxus EAPAX) ON PEAB. 

 References : 7, female, enlarged, showing form ; 8, 

 female, under side, greatly magnified. G, infested pear 

 branch ; 9, 9, spurs enfeebled, wood buds forming instead 

 of blossom buds ; 10, 10, clean growths with blossom 

 buds; 11, deformed pear caused by scale ; 12, clean 

 pear. 



ostrereformis) is similar, but smaller, and more closely disposed in infestations. One 

 characteristic of scale insects is that the brown are long and the white are round. 



White Pear Scale infests pears in warm situations, especially under glass. Size, -^th 

 inch ; form ovoid ; colour drab or dirty yellow. It may have been introduced frcm 

 America. Ordinary infestations of scale on hardy trees yield readily to treatment with 

 the caustic soda and potash solution described at page 251. Trees much infested may be 



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