278 LANDSCAPE GARDENING. 



able time in an open package, it loses its strength. It 

 should always be kept in a sealed can or glass-stoppered 

 bottle, and a fresh supply be obtained each season. Where 

 rose-bushes are but few, these insects can be kept from 

 doing serious injury by hand-picking; the easiest way to 

 gather them being to take a broad, shallow tin basin, put io 

 a little water with a tablespoonful of kerosene on top ? 

 hold the basin under the part of the bush examined, and. 

 touching the insects they will fall into the pan and be 

 destroyed. 



KOSE-SLUG (Monostegia rosea), Fig. 163. The rose-slug 



c, 



FIG. 163. ROSE-SLUG. 

 (Riley : " Insect Life," Vol. V., p. 274, Fij?. 37.) 



is the larvse of one of the saw-flies. The perfect insect 

 comes out of the ground the last of May or early in June. 

 The eggs are laid under the epidermis or skin of the leaf, 

 and the larvae appear in about two weeks, feeding upon the 

 soft green parts of the leaf and leaving nothing but the 

 midrib, veins, and epidermis on one surface. It is of a 

 greenish color, nearly transparent, the head much larger 

 than the posterior part of the body. It feeds rapidly and 

 must be attended to soon after the eggs hatch. 



Remedy. Dusting or spraying with hellebore or pyre- 

 thrum-powder is a certain remedy. If the dry powder is 



