40 SECOND REPORT ON ECONOMIC BIOLOGY. 



leaves. The larvae appear towards the end of June. They are 

 usually dark green in colour, with the sides of the body paler and 

 covered w r ith minute white spots ; variations are frequently met with. 

 When not feeding they curl themselves up on the underside of the 

 leaves. After destroying the leaves, which they eat down to the mid- 

 rib, they make their way into the shoots, often entering from a pruned 

 end. After tunnelling into the pith they form a special chamber and 

 remain here in the larval condition throughout the winter, pupating 

 in the following spring. 



PREVENTIVE AND REMEDIAL MEASURES. 



Spraying with a nicotine fluid will destroy the larvae. Arsenate 

 of lead is often recommended, but as it frequently disfigures the foliage 

 of roses the nicotine fluid is preferable. 



When pruning care should be taken to cut back attacked shoots 

 well below the position of the larva, and all prunings should be burned. 



