Rose Friends and Foes. 105 



these larvae enter the shoots, therein to assume the pupal 

 state. When this is the case, which is betokened by the dying 

 away of the shoot, it should be cut off and burnt. 



To the genus Hylotoma belong several species all more 

 or less destructive to the foliage of Roses, but none so 

 objectionable as the bluish-green larvae of //. roses (see illus- 

 tration), which are depicted in very characteristic attitudes. 

 Many Sawfly larvae on being disturbed appear to assume an 

 offensive attitude and sometimes contort the body violently. 

 The insect on the left shows the body erected as if on the 

 defensive. There are two broods of this species summer 



Larvae of Rose-leaf Sawfly (Hylotoma rosae). 



and autumn. The pupal state is passed beneath the soil in 

 cocoons. 



The above-named constitute the chief of the Sawflies 

 affecting Roses. No mention has been made of the perfect 

 insects, as little if anything can be done to prevent the 

 females from ovipositing. As regards treatment, those 

 species that feed openly may be dealt with by poisoning the 

 food-plant with Paris Green zoz. to 20 gallons of water. It 

 is best to get this very virulent poison in paste form. As, 

 too, Roses differ markedly in the texture of their foliage, it 

 will be well to try the effect on a small portion. In all cases 



