96 JOURNAL OF ECONOMIC ENTOMOLOGY [Vol. 12 



terial from corn plants infested by the European Corn Borer, Quaran- 

 tine Order No. 36 was issued by the Federal Horticultural Board and 

 became effective October 1, 1918. 



This quarantine prohibits interstate movements of all corn fodder, 

 or corn stalks, whether used for packing or otherwise; green sweet 

 corn; roasting ears; corn on the cob; and corn cobs from the towns 

 within the area infested by the European Corn Borer. 



The State of Massachusetts is now preparing to institute a similar 

 quarantine which will prohibit the intrastate movements of such in- 

 fested material. 



Danger of Spread through Transportation of Infested Ma- 

 terial Other than Corn and Corn Products 



If corn were the only plant attacked by the European Corn Borer 

 the problem of restricting the spread of the insect would be com- 

 paratively simple; but several of the other host plants present addi- 

 tional openings by which the pest may be transported through the 

 ordinary avenues of trade. 



In badly infested areas the larger larvse of the European Corn Borer 

 frequently leave their original host, whether it be corn or some of the 

 weeds or grasses, and enter other plants growing in the vicinity. This 

 change of habitat is generally due to the fact that the food supply in 

 the original host has been exhausted. Under these circumstances the 

 larvse may attack and enter almost any plant growing in the vicinity 

 and possessing a moderately soft and succulent stem. 



In home gardens, and in market garden areas it is a common prac- 

 tice to grow several crops close together, or inter-rowed in the same 

 area. Sweet corn is almost always included among these crops and 

 serves to attract the ovipositing females of the European Corn Borer. 

 After the food supply in the corn plants has been exhausted the larvse 

 enter the other plants. In this manner the larvse frequently infest 

 celery, Swiss chard, spinach, beans, beets, potatoes, tomatoes, and 

 some of the flowering plants including dahlias, gladiolus and chrysan- 

 themums. 



Celery 



The outer stalks of celery are tunneled by the larvae. As many as 

 eight full-grown specimens were taken from a single stalk. During the 

 process of harvesting celery most of these outer stalks are commonly 

 removed and discarded. Stalks infested by the European Corn Borer 

 are especially noticeable owing to their wilted appearance, but it is 

 very possible that recently infested stalks may be overlooked by the 

 ordinary workman and the insect transported to new localities through 

 this medium. 



