212 



THE XATTOXAT. C,K( ICKA PI I K' MAGAXIXK 



ITALIAN BROOM-CORN INFESTED WITH CORN-BORER 



It is now pretty well established that the European corn-borer reached this country 

 through shipments of Italian and Austro-Hungarian broom-corn. This picture shows a 

 shipment of Italian broom-corn which arrived at New York in February, 1920, and on 

 examination proved to be infested with this dreaded European pest. All foreign broom-corn 

 is now subjected to steam cooking as a condition of entry. This does not injure it for 

 broom manufacture, but kills any harbored insects. The corn-borer illustrates the continuing 

 risk of the entry of new pests with almost any sort of plant material, whether for manu- 

 facture or as packing for other articles of commerce, and indicates the breadth of the field 

 which must be guarded if foreign plant pests are to be excluded (see next page). 



probably as many diseases as there were 

 insects included in the insect-pest cata- 

 logue. 



Many of these insects and diseases are 

 known to be as serious enemies as many 

 of the worst of those already introduced. 



These catalogues and lists will, how- 

 ever, enumerate only the known plant 

 enemies. Most of the recent introduc- 

 tions from foreign lands of important 

 pests have been of insects or diseases of 

 which literature and available records 

 gave us no warning. 



Enormous areas in the old world have 

 been little or not at all explored with re- 

 spect to such plant enemies. This applies 

 particularly to China, Africa, and even 



to much of Europe, and from these areas 

 particularly have come pests like the San 

 Jose scale, the Oriental fruit worm, the 

 citrus canker, and the chestnut blight, 

 none of which were recognized as impor- 

 tant plant enemies prior to their importa- 

 tion and establishment in this country. 



LIVING PLANTS COMMON CARRIERS OE 

 NEW PESTS 



Most of these introduced plant enemies 

 have come to this country in connection 

 with living plants and many of them with 

 florist and ornamental stock. In many 

 instances the imported ornamental or 

 other plant has been a mere accidental 

 carrier of the new enemy. For example,. 



