460 Forms of the Hop Resistant to Mildew 



necator, and the "biologic form" attacking Vitis hederacea has not yet 

 reached Europe^ 



LITERATURE CITED. 



1. Hammond, W. H. On Red Mould in Hops. Journ. S. E. Agric. Coll., Wye, 

 IX, 19, 1900. 



2. Blodgett, F. M. Hop Mildew. Bull. 328, Cornell Univ. Agric. Exper. Station, 

 1913. 



3. Further Studies on the Spread and Control of Hop Mildew. Bull. 395, 



N. Y. Agric. Exper. Station, 1915. 



4. Salmon, E. S. Notes on the Hop Mildew. Journ. Agric. Science, ii, 327, 1907. 



5. A Monograph of the Erysiphaceae. Mem. Torrey Bot. Club, ix, 49, 1900. 



6. Supplementary Notes on the Erysiphaceae. Bull. Torrey Bot. Club, xxix, 



87, 1902. 



7. The Erysiphaceae of Japan. Bull. Torrey Bot. Club, xxvii, 437, 1900. 



8. The Erysiphaceae of Japan, II. Annul. Mycolog., iii, 252, 1905. 



9. Cultural Experiments with the Barley Mildew, ErxjsijAe Oraminis DC. 



Annal. Mycolog., ii, 70, 1904. 



10. Eyre, J. Vargas and Salmon, E. S. The Fungicidal Properties of certain 

 Spray Fluids. Journ. Agric. Science, vii, 477, 1916. 



11. Neger, F. W. Beitrage zur Biologic der Erysipheen. Flora, xc, 245, 1902. 



12. BiFFEN, R. H. Studies in the Inheritance of Disease-Resistance. Journ. 

 Agric. Science, ii, 109, 1907. 



13. Reed, G. M. Infection-experiments with the Powdery Mildew of Wheat. 

 PhytojMthology, ii, 81, 1912. 



14. Wawilow, N. Beitrage zur Frage iiber die verschiedene Widerstandsfahigkeit 

 der Getreide gegen parasitische Pilze. Arb. d. Versuchsst. /. Pjlanzenz. Moskau. 

 layidivirtsch. Inst., Folge 1, 1913. 



15. Hennings, P. Fungi japonici. Engler's Bot. Jahrb., xxviii, 271, 1900. 



1 At the present time no restrictions exist as to the importation from America of 

 Vitis hederacea. If our official Horticultural Authorities wish to save the "Virginia 

 Creeper" in this country from the danger of becoming attacked by mildew, they should 

 prohibit this importation or closely inspect the imported plants. 



{Received Fehruar)/ 28lk, 1917. 



