136 



Insect Pests. 



The Rosy Apple Aphis. 



(Ai'hi.'i soi'Jii. Kalte.nliach.) 



Tins species is ofLcii toun.l with Jphis pomi, and is frequently 

 confused with it e^■en by authonties such as Buckton, Mdiose figure 

 of the apterous viviparous JpJn. mali (povn) is really this insect. 

 It works in a similar way to the former, but seems to curl up the 

 leaves more ti-ktlv, and to give them a blistered appearance, the 

 attacked portions often having a rosy and pallid hue. Unlike A. 



210 mi, it does not pass all tlie 

 vear on the apple, for in June 

 and early July it migrates 

 from the apples and comes 

 back again in the autumn. 

 To what plant they migrate 

 is not yet known. They 

 have been found on the haw- 

 thorn {C'rataijus ox)/C(jntha), 

 the pear and on Sorlms 

 auciipai'Ki, i^orhiis domcsfinis 

 and Soiin's torniinotis. I 

 liave frequently found it on 

 the hawthorn, buit at the 

 same time as when observeil 

 on the apple. 



In colour it is subject 

 to much variation, unlike 

 A. pomi and A. fifchii. 



The "' stem mother," or 

 apterous viviparous female, is at first mottled with green and 

 yellow, laterally bluish, with a rusty tinge around the bases of 

 the cornicles, but she gradually becomes dull Iduish to lilack 

 or slaty-grey, or purple, covered with meal ; in form this stage 

 is glol)ular. The Lirv;e vary lait are usually yellowisli-greeu, 

 mottled with yellowish, head pale, cornicles blackish and legs 

 blackish, becoming bluish at the sides with pale yellowish bases. 

 The aplcfovs civiparoiis fcmaJcs are smaller than the stem nrother,, 

 rusty red to almost pink, with brown marks on the sides of the 

 abdomen and on tlie thorax ; tapering cornicles, dusky at the apices, 

 yellow at their base; later they become dusky purplish-black, dusky 

 red basally and covered with white meal, 'fhe ]iupa varies from 



\F. JideiHk'ii. 

 FIG. 100. — " STUM JIiiTllF.H" (VI\ II'Al:uUS FFM.U.K) 

 UF Apln" surtii, K.VI.T, 



