224 JOURNAL OF ECONOMIC ENTOMOLOGY [Vol. 15 



1 female moth were reared. The female laid fertile eggs, the larvae 

 from which established themselves on a com plant in an experimental 

 cage. The only other evidences of the second brood were 1 pupa and 



2 female pupal cases from the earliest flint corn, an adult male in late 

 July, an egg mass found on August 9th and a few 3d instar larvae 

 taken in August. 



The larvae in all varieties of the later corn, matured distinctly later 

 on the average and showed no signs of developing a second brood, but 

 prepared for winter about the middle of August and where not distiirbed, 

 would probably not move until spring. At harvest time about the 

 last of August and in early September in a flint corn field showing 70% 

 total loss, the estimated number of larvae per acre was 191,800. Of 

 these 27% were within 12 inches of the ground and a four inch stubble 

 carried 28,079 larvae, 6.82% of the larval population. 



There was no movement of any import in the standing field corn in 

 the fall, the distribution in the middle of October being practically 

 the same as at the end of August. However, there is a noticeable move- 

 ment outward and downward in the stalks in shock, but none of any 

 importance from the shock to the ground and neighboiiring stubble. 



The date of sowing was closely correlated with the degree of infes- 

 tation, the larval population and the total loss both in experimental 

 and field conditions. In general, com sown before May 24th was either 

 practically ruined or suffered severe loss; that sown between May 24th 

 and June 1st was heavily infested but suffered relatively less or but 

 slight actual loss depending of course upon the type of com; while 

 the corn sown after June 1st, although in some cases showing a fairly 

 high percentage of infestation carried few larvae and practically no 

 loss except in the case of sweet com. Thus on one farm of the three 

 com patches within 100 yards of each other, the sweet com sown April 

 25th carried a larval population of 234,200 per acre with a loss of 

 100%; sweet corn planted June 1st developed an infestation of 75% 

 and carried a larval population of 80,000 per acre with a loss of 20% 

 while flint (smut nose yellow) planted May 22d, only carried 54,400 

 per acre, a stalk infestation of 67% and a total loss of not more than 

 10%. The sweet corn here doubtless protecting the flint by attracting 

 a large nimi.ber of the moths. 



In the experimental plots the effect of the date of planting shows 

 up most clearly, as can be seen in the tabulation below, though here the 

 loss was slight and the larval population meagre, the corn all being 

 planted after May 24th. 



