292 



JOURNAL OF AGRICULTUEE OF P. E. 



This habit of eating the pollen, while not nsually serious, uiiglit at 

 times interfere with the pollination of the corn. 



The grubs pupate between the stalk and the leaf-sheath, or on 

 a*iy convenient portion of the leaf, and emerge as small yellowish 

 flies spotted and banded lightly with black. 



Control. — Fortunately the parasitic enemies of this insect are so 

 numerous that it never causes vserions damage, and no ni'tifieial rem- 

 edies are i-equired. 



CORN LEAF MINERS {Agromyzd parvicofiiis and Cerodonta dorsalis). 



The leaves of the corn are frequently mined by the larvae or grubs 

 of these two flies. The adult flies insert their small white eggs in 

 the tissue of the leaf and the young grubs burrow their way towards 

 the base of the leaves, devouring the tissue between the two leaf 

 surfaces. 



The grub of (Jerodo)i(a dormlis makes a long, narrow burrow or 

 mine and may occasionally leave the first mine and start another, 



')ut tiuit of Agromyza parvi- 

 yornls remains in the first 

 mine, forming a long, narrow 

 iiiine that finally spreads out 

 into a small blotch. 



Control. — As in the case of 

 ilic preceding species these two 

 insects also have so many insect 

 enemies that prey upon them 

 that they never becomes suf- 



FiG. 45. — Cou'ijea Stalk luul i'od Borer 

 (Ballovia cistiiieiniis). Adult. 



ficiently numerous to cause serious damage. 



OTFIER CORN PESTS. 



Aphis sp., feeds on roots: Diahrotica graminea, the larvae feed 

 on the roots and the adults on the tassels (see Okra, page 302) ; 

 Pseudococcui sp.. on roots. 



COWPEAS. 



STAEK AND voD BORER (Bollovia cistipeunis). 



The larva, of this small moth decs considerable damage at times 

 by boring in the stalks and ])ods of the cowpea. 



The presence of this caterpillar is indicated by a (juantity of 



