186 



APHIDES, SCALE INSECTS, ETC. 



hole from which a plant has been drawn, will do a 

 deal of good ; and any of the dressings we have 

 noticed to clear out insect-life, applied from time to 

 time, would be of service. 



The simple point is not enough considered with 

 regard to Aphis attack in the ground, — that unless by 

 any chance infection was carried on plant, or in earth, 

 the insect must have gone down at some previous 

 time to start the attack ; and if we kept the earth in 

 such a state that it could not go doivn, we should not 



Fig. 142. — Larch Cherme : female, with eggs; winged specimen, 

 and larva ; all much magnified. Infested Larch twig. 



have so much trouble. I would, therefore, strongly 

 advise such application to the surface, and such care, 

 that there should be no cracks, or the earth dried 

 away from the plant, or other means allowed for 

 ingress of the Aphis, as might reasonably be expected 

 to keep it out. 



The remaining tribe that is winged, includes the 

 Chervies, and (possibly) the Phylloxera. It is known 

 as the Chermcsince, and has no third wing-nerve (has 

 three, not four, oblique wing-nerves), and no cornicles. 



The Chermes abietis is one of the best known of this 



