THE YOUNG NATURALIST. 



183 



Aphides and their Food Plants. 



FOOD PLANTS. 



APHIDES. 



Cudweed 



Gnaphalium germanicum 



157. FlLAGINIS. 



found hiding under the woolly flower- 







bunches 











TTTTT? A XT t? T T T? A 

 1 Hj 1 XV A IN H, U IV A 



Elm, causing pedunculated oval galls to 



Vlmus suberosa 



158. Ulmi. 



form on the upper side of the leaf, 







about three-eights of an inch in height 











THELAXES. 



Oak (124, 125, 139, 140, 143, 144), on the 



Quercus sessilijiora 



159. Dryophila. 



young shoots 











GLEYPHINA 



Scotch Fir (1331 !35i I 3^i J 48i 162, 166) 



Piuus sylv6st?*is 



160. PlLOSA. 



Birch, infesting the ends of twigs 



Hernia alba 



161. Betulje. 









Scotch Fir ^ 133, 1351 136, 148, 160, 166) 



Piniis sylvestvis 



l62. CORTICALIS. 



inQPPf povprpfl with tnft^ of \vhitp 







oiiny iiuic 







Spruce Fir, causing swellings as large as 



Abies excels a 



163. Abietis. 



a hazel nut, very like true fir-cones 







Larch 



Piniis Lavix 



164. Laricis. 



insect covered with tufts of white 













C\a\r " Ahrlnmpn QT^af^plv nlntViPrl with 



Vvdli, A U^lOlllCLI opal DCly wlVJlllCU. YY1L11 



ygito/cuo xiui/U'i 



165- Atratus. 



long white filaments." 







Scotch Fir (133, 135, 136, 148, 160, 162), 



Pi flits svlvcttvit 



166. PlNI. 



** r^trpfprl ixritVi lr\ncf cili^xr filompntc 11 

 LUVCICU Willi lUllg^ alliiy llld.lllC.Ll la. 











tjttVT T flYTT "P A 



Jr xi x L^L^yJ AxLxv A 



Oak " itifpstinfy the undpt* 'sidp 5 ; nf thp 





167. Punctata. 



leaves of both varieties of the English 







oak." 







Oak, under the leaves. " Wherever these 





168. Quercus, 



insects congregate, a yellow or orange- 







coloured spot forms on the leaf, which 







penetrates through the substance and 







causes the upper surface also to ap- 







pear brightly speckled." 







Cultivated Vines, galls on the leaves and 





169. Vastatrix. 



young roots. 







(162.) This genus has been removed by some 



■writers to the Coccus. 





(169.) Professor West-wood published a notice of this pest, occurring on the vines at Hampstead, in the 

 " Gardeners' Chronicle," in 1868. Its original home appears to have been North America, but it has been 

 imported into all districts where the vine is cultivated to any extent. As an insecticide, the substance 

 known as sulpho-carbonate of potassium has baen triad with good results. It has also the advantage of 

 acting as a manure for the vines. 



