POWDERY MILDEW, Erysiphe graminis avenae. P. S. R.: Missouri 0-205, Missouri 04015, Neosho x Landhafer, Red Rustproof x Victoria Richland C. I. 4386, Sandhafer, and White Mildew Resistant. Inheritance: Trigenic.

PYTHIUM ROOT NECROSIS, Pythium debaryanum. P. S. R.: Black Algerian, Coastblack Early Red Rustproof, Flughafer, 'Red Algerian, and Ruakura. Inheritance: Unknown.

RED LEAF (YELLOW DWARF), virus, no scientific name. P. S. R.: Anthony-Bond x Boone (C. I. 5220), Anthony-Bond x Boone (C. I. 5218), Anthony- Bond x Boone (C. I. 5224), Arkwin, Arlington, Atlantic, Bondvic (C. I. 5401), Fulghum 708, Fulwin, and Mustang. Inheritance: Unknown.

SEPTORIA LEAF SPOT AND BLACK STEM, Leptosphaeria avenaria. P. S. R.: Anthony-Bond x Boone, Ajax, Beaver, Branch, Clintafe, Clinton, Shelby, Spooner. Inheritance: Unknown.

STEM RUST, Puccinia graminis avenae. P. S. R.: Canuck (Hajira x Joanette), Clinton x Ukraine (C. 1. 5871), Joanette strain, Richland, Victoria x (Hajira x Banner), White Tartar, and many derivatives of preceding. Inheritance: Monogenic.

VICTORIA BLIGHT, Helminthosporium victoriae. P. S. R.: Most varieties, except crown-rust-resistant Victoria derivatives. Inheritance: Monogenic.

RICE BLAST, Piricularia oryzae. O. S. R.: Collections by the United States Department of Agriculture P. E. I. 13056 (C. I. 1344) from Formosa in 1905; P. E. I. 31169 (C. I. 1779) from the Philippines in 1911; and selections from commercial variety in the United States. P. S. R.: Available now as Zenith and Rexoro. Inheritance: Monogenic dominant (Sasaki).

BROWN LEAF SPOT, Helminthosporium oryzae. O. S. R.: Collection of United States Department of Agriculture C. I. 5309 from China in 1918 and local selection. P. S. R.: Available now as commercial types being developed. Inheritance: Polygenic.

NARROW BROWN LEAF SPOT, Cercospora oryzae. O. S. R.: Collection by United States Department of Agriculture C. I. 461 and C. I. 654 from 1904 exhibit of Philippine Islands at St. Louis, Mo. P. S. R.: Kamrose and Asahi. Inheritance: Monogenic dominant (Ryker, Jodon).

WHEAT BLACK CHAFF, Xanthomonas translucens undulosum. O. S. R.: Unknown. P. S. R.: Thatcher and Marquis. Inheritance: Unknown.

BUNT, Tilletia spp. O. S. R.: Unknown. P. S. R.: Common bunt: Brevor, Elmar, Hope, Hussar, Martin, Newthatch, Oro-Turkey-Florence, Rex-Rio, and White Federation 38. Dwarf bunt: Brevor, Elmar, Hussar, Martin, Wasatch. Inheritance: Mono-genic to polygenic.

FLAG SMUT, Urocystis tritici. O. S. R.: Unknown. P. S. R.: Golden. Inheritance: Unknown.

LEAF RUST, Puccinia rubigo-vera tritici. O. S. R.: Unknown. P. S. R.: Common wheat: Exchange, Frontana from Brazil (Ill. 1 x Chinese)2 Timopheevi (Wis. 245), Klein Titan, La Prevision 25 (P. E. I. r68732 from Argentina), No. 43 (P. E. I. 159106 from Union of South Africa), Rio Negro (P. E. I. 168687 from Brazil), Supremo, and Timstein. Durum wheat: Beladi (P. E. I. 57662-5 from Portugal), Golden Ball- Iumillo- M ind um, RL 1714, Tremez Molle (P. E. I. 56258-1 from Portugal), Tremez Rijo (P. E. I. 56257-1 from Portugal). Inheritance: Monogenic to polygenic.

LOOSE SMUT, Ustilago tritici. O. S. R.: Unknown. P. S. R.: Hope, Kawvale, Leap, Pawnee, and Trumbull. Inheritance: Trigenic and unknown.

POWDERY MILDEW, Erysiphe graminis. O. S. R.: Unknown. P. S. R.: Asosan (P. E. 1. 155256 from Japan), Indian, Michigan Amber selection, Picardie (P. E. I. 168670 from France), Progress, Sturgeon, Suwon 92 (P. E. I. 157603 from Korea), Trumbull-Red Wonder-Steintim, C. I. 12559. Inheritance: Unknown.

SPECKLED LEAF SPOT, Septoria tritici. O. S. R.: Unknown. P. S. R.: Gladden, Nabob, and Nured. Inheritance: Unknown.

STEM RUST, Puccinia graminis tritici. O. S. R.: Unknown. P. S. R.: Common wheat: Egypt Na-95 (P. E. I. 153780), Hope, Kentana, Kenya 58, Kenya 117A, McMurachy, No. 43 (P. E. I. 159106 from Union of South Africa), Red Egyptian, Thatcher, Timstein. Durum wheat: Beladi (P. E. I. 57662-5 from Portugal), Golden Ball-Iumillo-Mindum, RL 1714, Tremez Molle (P. E. I. 56258-1 from Portugal), Tremez Rijo (P. E. I. 56257-1 from Portugal). Emmer:

Khapli. Inheritance: Monogenic to polygenic.

MOSAIC, Marmon tritici. O. S. R.: Unknown. P. S. R.: Butler, Chancellor, Royal, Thorne, Vigo. Inheritance: Unknown.

FIBER CROPS: cotton, fiber flax.

COTTON WILT, Verticillium albo-atrum. O. S. R.: Gossypium barbadense, G. hopii (Lewton), and G. hirsutum. P. S. R.: G. barbadense, Tanguis from Peru, 1936, and American-Egyptian varieties; G. hopii, Moencopi, and Sacaton aboriginal; and Acala x Hopi x Acala crosses 1-9 and 6-1-26; G. hirsutum, Delfos 4-19, Acala 10-13, Acala 23-21, Acala 29-16, and Acala 4-42. Inheritance: Polygenic.

DAMPING-OFF, Rhizoctonia solani. O. S. R.: Acala 29-16. P. S. R.: Now available as Acala 29-16, line 64. Inheritance: Unknown.

ROOT KNOT, Meloidogyne sp. O. S. R.: Hopi, Moencopi, and Sacaton aboriginal strains, particularly the latter. P. S. R.: Acala x Hopi x Acala 1-9-56. Inheritance: Polygenic.

FIBER FLAX RUST, Melampsora lini. O. S. R.: Variety Ottawa 770B. P. S. R.: Cascade, released in 1945, and Tallmune*. Inheritance: Resistance is a mono-genic dominant.

WILT, Fusarium lini. O. S. R.: Variety Ottawa 770B. P. S. R.: Varieties Cascade and Tallmune. Inheritance: Multiple factor.

ASTEROCYSTIS, Asterocystis radicis. O. S. R.: Variety Hercules, an introduction from Lincoln, New Zealand.

FORAGE CROPS: alfalfa, clover, cowpeas, southern legumes, soybeans.

ALFALFA WILT, Corynebacterium insidiosum. O. S. R.: United States Department of Agriculture collections from Turkistanin 1898 (Turkistan) and north India in 1,910 (Ladak). P. S. R.: Commercial varieties Ranger and Buffalo. Inheritance: Resistance is partially dominant, polygenic.

BLACK STEM, Ascochyta imperfecta. O. S. R.: Selected from commercial seed. P. S. R.: Clones in several breeding nurseries in Kansas. Inheritance: Several factors.

CROWN ROT, Fusarium sp. O. S. R.: Plant differences within strains. P. S. R.: Same as preceding. Inheritance: Unknown.

CROWN AND STEM ROT, Sclerotinia trifoliorum. O. S. R.: No clear strain or varietal difference. P. S. R.: Same as preceding. Inheritance: Unknown.

DOWNY MILDEW, Peronospora trifoliorum. O. S. R.: Plant and strain differences. P. S. R.: Same as preceding. Inheritance: Unknown.

LEAF SPOT, Pseudopeziza medicaginis.

O. S. R.: Regionally adapted varieties.

P. S. R.: Varieties Williamsburg, Narragansett, and Atlantic. Inheritance: Resistance is dominant.

ROOT ROT, Rhizoctonia sp. O. S. R.: Plant and varietal differences. P. S. R.: Same as preceding. Inheritance is unknown.

RUST, Uromyces striates. O. S. R.:

Mixed commercial seed stocks and varieties (Ladak). P. S. R.: Clones in several breeding nurseries in Nebraska. Inheritance: Multiple factors.

STEM BLIGHT and CROWN ROT, Colletotrichum sp. O. S. R.: Strain and varietal differences. P. S. R.: Same as preceding. Inheritance: Unknown.

YELLOW LEAF BLOTCH, Pseudopeziza jonesii. O. S. R.: Plant differences exist. P. S. R.: None.

DWARF. O. S. R.: Plant differences in commercial varieties. P. S. R.: California Common No. 49. Inheritance: Unknown.

YELLOW VIRUS. O. S. R.: Plant differences exist. P. S. R.: Same as preceding. Inheritance: Unknown.

PEA APHID. O. S. R.: Selections. P. S. R.: Selected inbred and hybrid Plants are being tested. None available Commercially. Inheritance: Unknown.

CLOVER Several species of Trifolium are resistant to crown rot, Sclerotinia trifoliorum, and powdery mildew, Erysiphe polygoni, as reported in "Sclerotinia trifoliorum, a Pathogen of Ladino Clover" by K. W. Kreitlow, Phytopathology, volume 39, pages 158-166, 1949 and "Susceptibility of Some Species of Trifolium, and Meldotus to Erysiphe polygoni" by K. W. Kreitlow, Plant Disease Reporter, volume 32, pages 292-294, respectively.

LARGE HOP CLOVER POWDERY MILDEW, Erysiphe polygoni. O. S. R.: Individual plant from a farm seed lot. P. S. R.: Resistant line in breeding material, North Florida Agricultural Experiment Station. Inheritance: Unknown.

RED CLOVER CROWN ROT, Sclerotinia trifoliorum. O. S. R.: Slight resistance in some farm strains grown where the organism is prevalent. P. S. R.: Slight resistance in Kenland, Kentucky Agricultural Experiment Station; in Stevens, Maryland Agricultural Experiment Station; and in Pennscott, Pennsylvania Agricultural Experiment Station. Abridged list, Sanford, Virginia Agricultural Experiment Station. Inheritance: Unknown.