INSECTS INJURIOUS TO CORN. 3II 



from the fire and add two gallons of common kerosene or coal oil, while 

 the liquid is still hot. Remove tlie spray nozzle from your pump, put 

 the pump into this mixture and* pump the liquid right back into itself. 

 This will churn it, and do so more thoroughly than any other process 

 that we know of. This churning should be done vigorously and kept 

 up continually for ten minutes, at the expiration of which time a com- 

 plete emulsion will have been formed, and the liquid will have increased 

 about one-third in bulk; hence the necessity of putting it into a larger 

 receptacle than will exactly hold it in the beginning. After the emuls?oa 

 has been made, add thirty-five gallons of water to it, stir thoroughly, 

 and spray with this. 



These two methods of killing the migrating army of chinch bugs, 

 when they try to enter the corn field (that is, by barriers or by spraying 

 the bugs with kerosene), if followed out, are worth more to the agricul- 

 turist than all other methods combined. In one day, we, in this way, 

 practically exterminate the mass of chinch bugs in the immediate neigh- 

 borhood, and we do so at a time just previous to the depositing of eggs 

 for the second brood, and, therefore, prevent that numerous increase 

 which would otherwise occur. Hence it would not -be unwise to again 

 call your attention to the fact that when the chinch bugs come to migrate 

 from the wheat to the corn they should be stopped by means of a dusty 

 barrier around the corn field, or, if this cannot be done, you should spray 

 them with some form of kerosene immediately after they occur in- large 

 numbers on the first few rows of corn. 



THE ARMY- WORM. 

 Leiicania unipnncta, Haworth. 



INTRODUCTION. 



The army-worm belongs to the great family of moths known as 

 Noctuidae. There are a great many insects belonging to this family and 

 closely related to the army-worm, which under certain conditions may, 

 in the larva stage, leave the field in which they are feeding and march in 

 a body, and hence it has come about that several distinct species of 

 insects are popularly spoken of as army-worms when these marches, 

 occur. But there is one insect that is known as the true army-worm, 

 and it is this insect alone that w^e will, describe in this article. Let it 

 be distinctly imderstood that the marching of the larvae of even the true 

 army-worm in numerous masses, as they sometimes do, is, like the 

 marching of the closely allied species, an entirely abnormal state of 

 affairs.. 



