﻿b DEPARTMENT OF AGRICULTURE BULS. 1351-1375 



Page 

 Department Bulletin No. 1361. — A Mosaic Disease of Winter 

 Wheat and Winter Rye: 



Introduction 1 



Distribution and importance 1 



Description of wheat and rye mosaic 2 



A leaf mottling not mosaic 4 



Inoculation studies 5 



The mosaic causal agent exists in certain soils 8 



Control measures 10 



Department Bulletin No.. 1362. — American Fruit and Produce 

 Auctions: 



Development of fruit and produce auctions 1 



Ownership and control of auction companies 3 



Position of auctions in channels of distribution 4 



Extent and growth of auction business 6 



Commodities sold at auction 8 



Sources of supply 11 



How the goods are handled and sold 12 



Auction sale of bananas 24 



Auction charges 25 



F. o. b. telegraphic auctions 26 



Essential points of auction law 31 



Summary 33 



Bibliography 35 



Department Bulletin No. 1363. — Host Relations of Compsilura 

 concinnati Meigen, an Important Tachinid Parasite of the 

 Gipsy Moth and the Browntail Moth: 



Source of collections and data 2 



Care of collections and methods of rearing 4 



Life history and hibernating hosts 4 



Status of hibernating hosts of Compsilura 5 



Generations of Compsilura 7 



Status of summer hosts 8 



Records of Compsilura rearings other than those recorded at the 



Gipsy Moth Laboratory 27 



Effect upon native parasites 27 



Effect upon host species 30 



Literature cited 31 



Department Bulletin No. 1364. — Effects on Honeybees of Spray- 

 ing Fruit Trees with Arsenicals: 



Introduction 1 



Effect on honeybees of spraying fruit trees in full bloom 3 



Preliminary experiments, Winchester, Va., 1914 3 



More extended experiments, W^inthrop, Me., 1914 4 



Effect on honeybees of spraying fruit trees at the custoinary time 10 



Experiments at Roswell, N. Mex., 1915 11 



Experiments at Benton Harbor, Mich., 1915 11 



Experiments at W^inchester, Va., 1915 and 1916 12- 



Experiments at Fennville, Mich., 1916 17 



Experiments at Drummond, Md., 1917 19 



Interpretation of results 21 



Minimum amount of arsenic fatal to bees in confinement 23 



Methods 23 



Experiments and results 23 



Discussion of literature 26 



Summary 28 



Literature cited 32' 



