REPORT OF THE FEDERAL HORTICULTURAL BOARD. 379 



diseases are not established in the citrus-growing regions of the 

 United States. 



Powdery scab has appeared in 17 lots of potatoes from Peru, 2 

 from Ireland, and 3 from England. The records from Peru are 

 peculiarly interesting, since this disease occurred on wild potatoes 

 from the east slope of the Andes and clearly indicate that Peru is 

 the home of the powdery scab of the potato. 



Nematodes have been detected on plants from France, Philippine 

 Islands, Argentina, and China. 



In all, some 116 specific diseases of which the causative organism 

 was identified were detected on 185 different kinds of imported plants. 



INSPECTION AT PLANT INTRODUCTION GARDENS. 



All plant material distributed from Yarrow, Md., was examined 

 and certified at the time of shipment by both entomological and 

 pathological inspectors of the board. The plant material distrib- 

 uted from Chico, Cal., was examined by collaborators of the board. 

 No shipments were made from Miami and Brooksville, Fla., except 

 parcels containing dasheen tubers, chayotes, and fruit. 



POTATO IMPORTATIONS. 



Potatoes may be imported into the United States from the following 

 countries: Denmark, Holland, Belgium, Cuba, Bermuda, and the 

 Dominion of Canada, these several countries having made representa- 

 tions that adequate field inspection, conducted by recognized experts, 

 have shown freedom from potato wart and other injurious potato 

 diseases and insect pests and having further agreed to examine and 

 certify all potatoes offered for export in compliance with the regula- 

 tions governing the importation of potatoes into the United States. 

 Canada, having agreed to offer for export into the United States only 

 potatoes free from injurious diseases and insect pests, the examina- 

 tion and certification by the officials of the exporting country have 

 been waived in accordance with the first proviso in regulation 2 of the 

 Regulations Governing the Importation of Potatoes into the United 

 States. All Canadian potatoes are, however, subject to inspection on 

 arrival by an inspector of this board, and entry will be refused to any 

 shipment of potatoes badly infested with disease, even though the 

 disease is one which may already occur in the United States, such as 

 common scab, dry rot, powdery scab, fusarium wilt, and black leg. 

 Provision has also been made for the importation of potatoes from 

 the states of Chihuahua and Sonora, Mexico, and from the island of 

 Santo Domingo without foreign inspection and certification. Impor- 

 tations from Santo Domingo are admitted only through the port of 

 New York, where they are inspected prior to entry. On account of 

 the European war, very few shipments of potatoes were received 

 from the three European countries named. 



COTTON IMPORTATIONS. 



The order referred to in the report for 1915, regulating the entry of 

 cotton into the United States to guard against the introduction and 

 possible establishment of the pink boll worm and other injurious 

 cotton insects, and the regulations promulgated under said order, 

 became effective July 1, 1915. 



72412°— aob 1916 25 



