348 AMERICAN POMOLOGY. 



inches, to form their chrysalids. In three days they come 

 up as flies, in July and August, to lay eggs for a second 

 brood, the pupse of which remain in the ground during 

 the winter. 



Another insect of this genus is very destructive to our 

 rose bushes ; it is called Selandria rosce. 



Selandria vitis, is a species that appears upon our grape 

 vines, and is quite troublesome in some vineyards in July. 

 They feed in companies of a dozen or more. 



REMEDIES. Shaking them off the leaves has been rec- 

 ommended, but does not promise to be effectual. When 

 few, they should be sought for and crushed, to prevent 

 their increase. Though troublesome, this may be effec- 

 tually done, and their ravages leave traces that will direct 

 us to the leaves which contain them. 



When more numerous, the foliage may be syringed with 

 common soapsuds, or with the whale oil soap, two pounds 

 to fifteen gallons of water. 



Air-slaked lime has been dusted upon them with good 

 effect ; ashes, and even dry dust from the road, will de- 

 stroy them, by adhering to the slimy surface. These ap- 

 plications are best made when the foliage is wet after a 

 shower, or with the dew. The great difficulty consists in 

 their habit of going under the leaves, and thus being 

 protected. 



Mr. Parkman, the noted rose fancier, has found a mix- 

 ture of soap and petroleum of great service, as it kills the 

 slugs without injuring the buds and foliage. To a gallon 

 of soft soap he adds two-thirds of a pint of petroleum, mixes 

 them thoroughly, and dissolves in half a barrel of water ; 

 to be applied with a syringe. 



