286 



GARDEN FOES. 



body is covered with soft down. They lay their eggs in 

 June on the leaves of poplars and willows, and in due 

 course caterpillars appear, which are easily recognised by 

 their peculiar shape. At the extremity of the body are 

 two horn-like projections, and the colour is a purplish- 

 brown, striped with white. The larvae feed on the leaves, 

 and when fully matured they gnaw away a portion of a 

 shoot and glue the debris together to form a cocoon, in 

 which they change to a chrysalis, and emerge as moths 

 in the following June. 



Kemedies. — Hand-picking, or spraying with Foi'muke 

 Nos. 10, 11, or 12. 



LAKVA OF rUSS MOTH 



[Photo: J. G. Blakcy. 

 lDICl{ANULA VINULA). 



Spruce-srall Aphis (Chermes abietis).— This aphis 

 infests the young shoots of the spruce fir, causing galls or 

 protuberances to form, and checking the proper develop- 

 ment of growth. As in the case of the T^arch Aphis, so 

 in this, there is a mother Chermes wlu'cli surviAcs the 

 winter, .and lays from one to two lunulred eggs in May 

 on the shoots. These eggs give birth to larvir, which at 

 once pierce the tissues with their suckers and feed on 

 the sap. The irritation thus produced causes galls to 

 form, under the protection of which the l^rvt^e thrive. Th^ 



