HOW TO DESTROY IXSFf'TS. 



87 



various expt^riiiieiitSy sa^'s : We found that for the 

 large measiire-worra, whicli so often infests our cin 

 trees and grape-vines^ a decoction of tlie Carl)oiic 

 Plant Protector^ sufficiently strong to kill or dislodge 

 the worm itself^ was strong enough to scorch and injure 

 tiie leaves of the vines also. But for bark-lice and 

 more tender worms and insects it was a most beneficial 

 agent. It is especially useful and preventive against 

 future attacks of insects. If plants are syringed freely 

 once or twice a week the odor alone will repel insects, 

 while there is no doubt the eggs of future progeny are 

 destroyed also. Our first application to the grape-vines 

 destroyed the worms, but scorched the leaves and re- 

 tarded the ripening of the fruit. This was the effect, 

 probably, of being too strong. The odor, however, 

 remained in the garden and on the ground for several 

 weeks, and there was no attack of insects thereafter. 

 Some caterpillar-nests were also discovered, but a 

 thorough soaking soon placed them all out of danger. 



For clearing the barks of any trees infested with 

 lice or scales, or to keep off worms or borers, it is most 

 excellent. We liave seen worms writhe in agony when 

 .under the fumes of the acid, and a single touch of the 

 raw substance upon their backs has killed them in 

 thirty seconds, the effects upon the skin being like that 

 of red-hot iron scorching.'' 



This experience has been confirmed by a Pennsyl- 

 vania gardener, who says : 



