WIUTE GRUBS 



229 



one side. The greedy larva feeds during the night and hves during 

 the day in a httle silk-lined tube about one inch below the surface. 

 The larva does not pupate before winter, but hibernates in the silk- 

 lined tube. In the spring its growth is completed. It then pupates 

 and by June loth the imago is dropping eggs carelessly about in the 

 grass. These hatch in from lo to 20 days, when the larva again 

 appears. It is not definitely known whether the larvae change to 

 moths and another generation is produced for hibernation, or wh?t:'i"i 

 the first generation grows until autumn and then hibernates. 



Prevention and Remedy. The above outline of the life cycle de- 

 mands the early fall plowing of sod which is to be used for corn the 

 next year. But if the plowing has to 1)e left until spring the web 

 worm will be most disturbed if this operati(_>n is postponed until after 

 May 25th. 



WHITE GRUB (Lachnostcma rugosa). The white grub is a very 

 difficult pest with which to deal because it attacks a number of vari- 

 eties of plants. 



The eggs from which the larvae 

 ^SiWS S^A are hatched are laid chiefly in grass 



land, although occasionally they may 

 be deposited in fields of corn. The 

 adult female is a rather large, thick. 

 short beetle, having hard wing cov- 

 ers of a brownish color. They are 

 commonly seen in the early summer 

 flying about arc-lights, and are 

 known as "June beetles" or "May 

 beetles." These live but a short 

 time. The males die soon after the 

 sexes pair. The females begin lay- 

 " 'jiw« -fj' ■* »^ ^^^ ^??s in June, and by the first oi 



tS^H^ .iW *7 July have practically finished. These 



eggs are placed from an inch to 

 four inches deep in the ground and 

 hatch in from two to three weeks' 



The common Sod Web-worm 



(Crambus trisectus) time. 



Back and side views, much enlarged. "fhe young grubs attack the roots 



of grass at once, and grow very rapidly during this first season. The 

 following winter they hibernate in the same stage and live as larvae 

 during the next summer until July, when they pupate. They exist in 

 this state until the middle or latter part of August, when the adult 

 form appears. The imago, or adult, usually remains right in its place 

 of origin until early the next spring. Then it emerges as a "June 



J^ 



"v 



