94 



KINDS OF WHITE GRUBS. The species that exist in Quebec have 

 not been thoroughly studied. Dr. Forbes of Illinois, however, has made a 

 careful study of the forms existing in that state. He found the following 

 species doing injury in corn fields: Ivachnosterna fusca, 1,. gibbosa, h. 

 inversa, L. rugosa, L. implicita, L. hirticula, L. ilicis, ly. trista and 

 L. fraterna. These species are difficult to distinguish, more especially in 

 the larval stage. For indentification consult Blatchley's "Coleoptera of 

 Indiana" and 17th Report of State Entomologist of Illinois, 1889-1890, 

 by Dr. Forbes. 



Lachnostema rugosa ; a. June-bue, adult ; b. June-bug or white grub larva ; c. last segment ol 

 white grub and larva. 



CONTROIv. 



As with Wireworms, remedial measures are difficult. Special rota- 

 tions are advisable. Fletcher says "A short rotation in which clover fol- 

 low^s grajss or is grown at short intervals will prevent the increase of 

 these insects. In this special rotation the small grains should follow^ clo- 

 ver before corn or potatoes." When a field becomes infested with White 

 Grubs a portion of the clover field, for example, might be broken and 

 planted to com instead of planting corn after timothy or grass. To 

 m.ake up for the deficiency of clover that portion of the sod field which 

 would have been devoted to corn could be sown with oats, vetches, etc., 

 for green feed and hay. It is perfectly safe to put mangels, turnips and 

 rape after old sod, although one will have to be on guard against cut- 

 worms nipping off the young plants. 



