REPORT OP THE FEDERAL HORTICULTURAL BOARD. 373 



and Queensland, is also a very destructive parasite which in favorable 

 seasons completely prevents corn from developing any fruit in For- 

 mosa. Unlike the Java corn disease, the Queensland leaf stripe 

 disease attacks also sugar cane, upon which it is a destructive para- 

 site. Other mildews seriously destructive to corn occur in British 

 India and in the Philippines. All of these downy mildews are fav- 

 ored by warm, moist weather, such as is considered to be ideal corn- 

 growing weather in the Mississippi Valley; and if these diseases should 

 reach this country and become established in the Mississippi Valley, 

 they would probably cause enormous damage to our most valuable 

 crop. 



DOMESTIC QUARANTINES. 



Hawaiian cotton. — Quarantine No. 23, revised, promulgated 

 February 11, 1916, effective on and after February 16, 1916, amends 

 and supersedes Quarantine No. 23, promulgated June 11,1915. This 

 quarantine forbids the movement from Hawaii into or through any 

 other State, Territory, or District of the United States of raw or 

 unmanufactured cotton, except in accordance with the regulations 

 prescribed therein, with the object of preventing the introduction into 

 the continental United States of the pink boll worm {Gelechia gos- 

 sypiella Saund). 



Gipsy moth and brown-tail moth quarantine. — Quarantine 

 No. 25, promulgated May 22, 1916, was originally issued November 

 5, 1912, as Quarantine No. 4, and has been revised and amended 

 annually to embody the annual revision of the territory necessitated 

 on account of the changes in distribution of these two insects. This 

 quarantine defines the districts in New England infested by the 

 gipsy moth and the brown-tail moth, and prohibits the movement in 

 interstate commerce of plants and plant products except in accordance 

 with the regulations prescribed therein. The spread of the brown-tail 

 moth during the year was so slight that it was unnecessary to extend 

 the quarantine line on account of this pest. The spread of the gipsy 

 moth was considerably less extensive than last year. 



The inspection and certification of Christmas trees and Christmas 

 greens from the area infested by the gipsy moth was undertaken 

 last year for the first time. The amount of such material for which 

 inspection and certification was requested was much less than had 

 been expected. The authorities of the States of New York and 

 Ohio were, however, unwilling to receive such certified Christmas 

 trees and Christmas greens, and established quarantines against such 

 material originating in the area infested by the gipsy moth, taking 

 this action both on account of the difficulty of inspecting such trees 

 and greens on arrival at destination and as an expression of lack of 

 confidence in any inspection of such masses of material. In point of 

 fact, however, no gipsy-moth infestation has been found on any of 

 the certified Christmas material shipped from infested districts. x\ll 

 shipments of certified products from the areas quarantined on 

 account of the gipsy moth and the brown-tail moth to points out- 

 side of these areas are being reported to the proper officials of the 

 States receiving such shipments, so that at destination reinspection 

 may be made by State inspectors if desired. 



As in former years, the cost of administering this quarantine was 

 paid out of the special appropriation for preventing spread of moths 

 granted to the Bureau of Entomology. 



