LESSEE APPLE LEAF-FOLDEK. 23 



well to have gone through his nursery early in the season and 

 picked off the I'olded leaves. 



The importance ot combatting evils in their incipient stages 

 can find no more apt illustrations than in the department of eco- 

 nomic entomology. Many noxious insects can be substantially 

 eradicated in their infancy, which, if permitted to attain a larger 

 growth and a wider spread, are wholly beyond our control. This 

 is emphatically the case with the present species. It is evident 

 that whatever applications we may make use of here, must be 

 made before the young insects have time to close the leaf above 

 them, in the case of the first brood, and before they have covered 

 themselves with web, in the second. These periods will probably 

 be found to be about the first week of May and the third week of 

 July. Eut the time will vary some with the character of the 

 season, and must be determined by actual inspection. These lit- 

 tle worms are so tender and so unprotected by any hairy covering, 

 that I should expect them to be easily destroyed by any of the 

 ordinary applications, such as lime, ashes or soap, provided we 

 can find a time when the substance applied will really reach them* 

 Mr. Weir informed me that he discovered a bug with many 

 bright stripes, preying upon these caterpillars, which from his de- 

 scription, I suppose to be the Ilarpactor cinctiis/ but this tribe of 

 predacious insects is not usually sufficiently numerous to make 

 much headway against such a multitudinous species as the Tor- 

 irix malivorana. 



