188 



Fio. 1S4. Tlio Sovithoi-n Corn 

 I?oot-worin, IHabrotim IJ-panclalii, 

 achilt. Loiigtli iibout one fourth incli. 



arc said lo cause; the <>;rcai('st injury to youii^- iiicloii vinos, to food also 

 to some (wlcnt on tlio lra\'(>s of corn, nnd to liavo caused consi(l(>ral)l(,' 

 injiny to llic folin^c of apricots and peaches. TUo larvae are reported 



to live in the j^round and to he nion; or 



Lless injurious to the roots of coi'n and 

 I other i)lants. In New Mexico the adult 



J has been recorded as feedinji; on pea, 



,fi>'^^ squasli, sor<;huin, and allied jjlants, and, 



in one locality, as <;'enerally injurious to 

 trees, potatoes, and niiscelhineous vege- 

 tables. 



The southern corn root-worm, D. 

 hl-jtimclaia, is frecpiently found in the 

 adull^ stage (Fig. ISI) on the corn jjlant, 

 (>ating small irregular or longitudinal 

 holes in the leaves or gnawing away the 

 edges, cutting off the silk, devouring the 

 poll(Mi, and sometiuK^s eating the unripe 

 kernels. We have seen it quite munerous 

 in \(\\ clover, eating the leaves and blos- 

 soms, i'^urtlun* details arc given in the 

 Eighteenth Reportof this office (page 148). 

 /). i<oror is verv similar to the preceding, and rcplact^s it on the Pacific 

 (ioast, where it injures corn in the same manner, both in the l;>r\;d ;md 

 adult stages, as does its eastern relative. 



The adult striped cucumber-beetle, 7). viiUiht (l''ig. 185), has several 

 times been found by us eating the leaves. polIcMi, silk, or uiu'ipe k(>rnels 

 of corn, but not to any scM-ious e\t(Mit. 



The beetle of the conunoii coi-n root-worm, I). loiKjiconiis {V'v^. 1S()), 

 eats the leaves of corn to 

 a small extent, ;uid feeds 

 freely on the pollen anil silk, 

 occasionally injuring also the 

 kern(>ls at the tip of the 

 young ear where tliis is not 

 covered by the husk. When 

 corn has lieen heavily in- 

 fested by the root- worm 

 itself, the beetles often col- 

 lect in surprising numbers 

 in the green silk, a fact 

 which has given them the 



p J.1 (<„Mi a )> : l''*^- ^8^- The Striped tUicuiuber-beetlo, Diabrotica 



name Ol the SllK-ny m vUlata: u, adult; />, larva; c. pupa; d, tip of larva, side 



1 J.1 111- •„ I view. Kiilargeil as iiulicatod. (Chittenden, U. S. Dept. 



extreme southern lUmois. in of Agriculture.) 



