1917] CONTENTS. V 



Page. 



Report of committee on fungus diseases, Manns 540 



Cooperation in the investigation and control of plant diseases, Kellerman 540 



[Plant diseases in Barbados], Bovell and Dash 540 



Annual report for 1915 of the botanist, Biffen 541 



Hydrogen ion concentration and natural immunity in plants, Wagner 541 



Crown gall or plant cancer, Smith 541 



North American species of Allodus, Orton 542 



Some species of Nummularia common in Indiana, O'Neal 542 



The genus Rosellinia in Indiana, Ramsey 542 



Correlation of certain long-cycled and short-cycled rusts, Travelbee 542 



Continuous rust propagagation without sexual reproduction, Ludwig 542 



Cereal diseases and pests, Riehm 542 



Cereal rusts in subtropical South America, Gassner 542 



Dependence of rusts on the stage of the host and external factors, Gassner 542 



Oat smut in Indiana, Pipal 542 



Leaf smut of timothy, Osner 543 



Plant diseases affecting alfalfa, Melchers 543 



Alfalfa crown wart in the western United States, McKee 543 



A new disease of beets in northern France, Mi^ge 543 



Is cucumber mosaic carried by seed? McCUntock 543 



Peanut mosaic, McClintock 544 



Fungus parasites of the pigeon pea, Rangel 544 



Silver ecurf of the white potato, Taubenhaus 544 



The sweet potato "soil rot" or "pox," a slime mold disease, Elliott 544 



The sweet potato " soil rot " or " pox " organism, Elliott 544 



Tree wounds and diseases, their pre-v^ntion and treatment, Webster 544 



Sun scald of fruit trees, a type of winter injury, Mix 544 



Control of pear scab, Smith 545 



Peach scab and its control, Keitt 545 



Grape anthracnose in America, Shear 545 



Studies on Plasviopara viticola (downy mildew of grapes), Gregory 545 



Downy mildew on direct bearers, Obiedoff, Baquero, and Pehlivanoglou 546 



Variations in the resistance of grape to downy mildew, Ravaz and Obiedoff 546 



Powdery mildew of grapes and control in United States, Reddick and Gladwin . . 546 



Leaf spot on vines, Dobson 546 



Chlorosis of pineapples induced by manganese and carbonate of lime, Gile 546 



The causes of unncessary decay in lemons, Willits 546 



Overwintering of Oidium parasitic on Photinia serrulata, Peglion 546 



On Oidium mildew on carnations, Mercer 547 



Tho biology of Uredinese on Geranium, Jacob 547 



A new leaf spot of Viola cucullata, Anderson 547 



The control of damping-off of coniferous seedlings, Hartley and Pierce 547 



Parch blight on Douglas fir in the Pacific Northwest, Munger 547 



The alternate hosts of the white pine bHster rust, Grose 547 



[The white pine blister rust situation], Spaulding 548 



White pines of Lenox menaced 548 



Endothia parasitica and related species, Shear, Stevens, and Tiller 548 



Notes on some South African mistletoes and their hosts, Marloth and Drege 548 



Some studies on Bordeaux mixture, Lutman 548 



ENTOMOLOGY. 



Miscellaneous notes on injurious insects, Parrott and Hodgkiss 549 



Some new or rare fruit pests. Hall 550 



Potato insects, Webster 550 



The insect fauna of New Jersey greenhouses, exclusive of the Coccidae, Weiss 550 



Cacao thrips and die-back in St. Vincent 550 



A synopsis of the genus Oxythripe, Hood 550 



A new Plectrothrips from Jamaica, Hood 550 



Check list of the Hemiptera of America, north of Mexico, Van Duzee 550 



Remarks on Lygus invitus, a new species and variety, Knight 550 



The ash leaf bug, Neoborus amoenus, Dickerson and Weiss 551 



Notes on cicadas from the United States with several new species, Davis 551 



The identity of Eriosoma querci, Baker 551 



Monarthropalpus buxi in New Jersey, Weiss 551 



Susceptibility of eggs of Aphis pomi and avense to hydrocyanic acid, Ross 551 



