RAVAGES OF GRUBS. 229 



The best way of prevcntiiifr the ravages of these 

 insects would be to cniiiloy cliildrcn to collect the 

 perfect insects when they first appear, before they lay 

 their eggs; but when a field is once overrun with 

 the larva, nothing can be done with it, except paring 

 and burning the surface, or ploughing it up, and 

 turning in a Hock of ducks or other poultry, or a 

 drove of pigs, which are said to eat these grubs, 

 and to fatten on the fare. J)renching the ticld with 

 stable urine* by means of reservoir carts, like those 

 used for watering road.s, would, if sufficiently done, 

 both kill the grubs, and beneficially manure the land. 



The grub called the uire jcorm, though not very 

 appropriately, is the larva of one of the spring or 

 click beetles [Hcmivliipus Untatus, and H. obscurus^ 

 Latreili.e), known by their long flattish body, and 

 their power of springing with a clicking sound out 

 of the hand when caught. In some works on agri- 

 culture, the larva of a common crane fly {Tipula 

 olcracca or T. crocaia) is called the wire 7rorm, — we 

 suppose by mistake, j The grubs of the click bee- 

 tles, just alluded to, arc said by Bierscander J and 

 by Mr Paul of Starston, ZVorfblk,^ who watched 

 their transformations, to continue five years before 

 producing the perfect insect. During this time the 

 grub feeds chiefly on the roots of wheat, rye, oats, 

 barley, and grass; but seems also sometimes to attack 

 the larger roots of potatoes, carrots, and salads. Its 

 ravages are often so extensive as to cut ofi" entire 

 crops of grain. It appears to be most partial to land 

 newly broken up; and has not been found so abun- 

 dant in meadows and pastures, unless in fields recently 

 laid down with grass. ' The wire worm,' says 

 Spence, ' is particularly destructive for a few years 



* Sec the llarleian Dairy System, p. 222. 

 T See London's Encycl. of Agricult. § 6921. 

 t Act. Holm. 1779, p. 284. § Kirby and Spence, i, 182. 

 VOL. ri. 20 



