18 BULLETIISr 363, U. S. DEPARTMENT OF AGEICULTURE. 



It would be an added measure of safety if a watchman were 

 kept on guard on the premises from the time the application is 

 made until ventilation is complete. It would also be well to place 

 large "DANGER" signs on the doors. 



OTHER REMEDIES. 



Among other remedial measures storage of corn in large bulk is 

 recommended, since the surface layers of shelled corn or other grain 

 are most exposed to infestation while the lower portions are not so 

 apt to be injured, if at all. The larvse could penetrate corn in the 

 ear to a considerable depth, but, as their life is short, this is probably 

 seldom done. The moths are unable to do so. Agitation applied to 

 a mass of grain is also destructive to the moths, since they are unable 

 to extricate themselves and perish in the attempt. Cold storage 

 may be employed for valuable seed corn, and naphthalene balls may 

 be used for the same purpose. The most scrupulous cleanliness 

 should always be observed, much injury due to stored grain insects 

 being directly traceable to disregard of this. Old grain and refuse 

 material containing sweepings of grain, dust, dirt, and rubbish in 

 general should not be allowed to accumulate and serve as breeding 

 places for injurious insects. 



In conclusion, it should be stated that promptness is absolutely 

 necessary for the control of the pink corn-worm and that bisulphid 

 of carbon can not be profitably used in open cribs, so that if this 

 insect continues its ravages it may be necessary to construct special 

 fumigating buildings and to store the corn in tighter receptacles than 

 the cribs and bins now used. 



SUMMARY. 



1. The so-called pink corn-worm is not a true worm, but the cater- 

 pillar or larva of a minute moth known as Batrachedra rileyi. 



2. Attack on corn begins in the field and continues after the corn 

 has been stored. When the stored product is husked, the infested 

 ears show injury by accumulations of webbing and frass or excre- 

 mentitious matter. A careful inspection discloses the "pink worm." 



3. The eggs are deposited in the field where the tips of the corn 

 ears are more or less open, due to the attack of the corn-ear worm. 

 After the latter has departed the pink corn-worm continues the 

 injury and by its work makes it easy for other insects and water to 

 enter the ears, which eventually are ruined. 



4. From the cob or between the rows of grains the worm pene- 

 trates the kernels at the tip or point of attachment, works into the 

 embryo or "germ," which it destroys, then outward to tlie crown. 



5. Unlike the Angoumois grain moth and the rice weevil, which 

 are usually to be found working in the same fields and frequently in 



