9.3 



t(;n U) Uiirty in three of i/iorf; overlapfjirif^ njwK fasl/ined [;y a Kiucilagi- 

 nouH matUjr t/) the l(;af. The eggH an; about a rnillirnoter long, r)val, 

 flattened, light yellow at first, but changing thn)Ugh orange to brown 

 with a black center. The egg stage lasts about a week. The young larva; 

 sjMn a fine thread wherj traveling. They eat or mine the leaf at first, 

 but fjuickly disappear witFiin the stalk !i,nd coriinif-nce to tunnel, usually 

 upward, through the cent<;r. They 



grow raf)idly, and are very active, ^ / 



frequently leaving the stalk at j^ , ' ' ; 



one fjlace and (;nt(!ring it at an- \ - ) 



oth(;r, eaf;h thus making sf;venil , I 



hol(!H in the corn [)lant during its 

 growth. They mature in about 

 a montfi, then l;oring an opening 

 ff>r the escaf>e of the moth and 

 sfjinning a few thr<;ads across it. 

 They (Mifjate in their burrows 

 about tiie midrjk; oi .July, the 

 fjupa lying with its head near tin; 

 opening. It is iiakerl, shining 

 brown n'"ig. 7'4, c), from •.> ludf 

 to thre(; fourths of an inch long, 

 with abdominal spines and tuber- 

 cles, it is capable of vif>lf!nt contortions when disturbed. Whfjn about 1x> 

 hibernaUi, the caU^rpillar burrows riown into th(; tap-root of the f>lant, 

 and wint<;rs at or a little below the surface; of the groufid. In V'ijginia 

 the ])\\\)ii HiaUi is usually n-ached from the middle of July on, and the 

 moths (Fig. T'-J, a, h) issue in from ten days U) two wr;ek.s Ia1/;r. 'J'lie 

 eggs for the second generation are laid soon aft<;rwards on the well-grown 

 stalks, and these larva; are full grown by harvest tirnf:. I'rom ten days 

 U) twr) weeks Iat<ir, moths of the second brood begin Uj af^pear, and lay 

 eggs on the old corn for anoth(;r generation of cat/;rpillars. 



Marly jjlant(!d corn is said te> be more lia(>le U) infestaticjn than later 

 f)lanti/igs, and corn grown on ground where the f^rofj was infesU;d the 

 previous year is particularly (ixposed t^) attar;k. 'I Ik; b'niUjd States 

 iJivision of IOnU>rnology cfjmput/;d in ISOl an average loss of ten 

 per cent, tfj corn on sod land, and of twenty-five per cent, ix) corn fol- 

 lowing upon f:orn. If, rifjtwithstanding a judicious rotatior/ fjf crops, 

 a field shfjuld become notic(;ably inff;sU;d, the insects could be com- 

 plet^;ly destroyf;d in hibernation by plowing out, raking ufj, and burri- 

 ing the corn stuVjble in the field in fall or early spring. 



]''i<;. T.i. 'J li<! Lurv.i-.r Oini HUiikhnn-.r, /na- 

 Inita Hiirrli'iridiH: a, U:ii\:i\i;; h, wiiiKH '»f f/iair;; 

 c, piip.'i. KiAtirie.ii'i 'in jfcJicalcJ. (Jlowar<J, 



11. K. i)t:\ii.. '<f AK'icijItlJICJ 



