FAMILY aiAKMORACEAE 



1189 



storage in expressed juice at room tem- 

 perature, 20 to 25° C. 



Literature: Elliott, Phytopath., 11, 

 1921, 146-148; Gardner, Indiana Acad. 

 Science Proc, 36, 1927, 231-247; 37, 1928, 

 417; McLean, Phytopath., 31, 1941, 420- 

 430; Smith, Science, 60, 1924, 268. 



36. Marmor repens Johnson. (Phyto- 

 path., 32, 1942, 114.) From Latin repens, 

 unlooked for, in reference to unexpected 

 discovery of this virus as a constituent of 

 a complex formerly regarded as a single 

 virus, so-called "white-clover mosaic 

 virus". 



Common name : Pea-wilt virus. 



Hosts : LEG UMINOSAE—Trifolium 

 repens L., white clover. Experimen- 

 tally, also Lathyrus odoratus L., Lens escu- 

 lenia Moench.; Lupinus albns L. ; Medi- 

 cago lupulina L. ; Melilotus alba Desr.; 

 Phaseolvs aureus Roxb., mung bean; P. 

 vulgaris L., bean; Pisum sativum L., pea; 

 Trijolium hybridum L.; T. incarnatum 

 L.; T. praiense L.; Vicia faba L.; V. 

 saliva L.; Vigna sinensis (L.) Endl., 

 cowpea. 



Insusceptible species : CARYOPH YL- 

 LACEAEStellaria media (L.) Cyrill. 

 C HENOPODI ACE AE— Beta vulgaris 

 L.; Spinacia oleracea L. COMPOSI- 

 TAE — Callistephus chinensis Nees; Lac- 

 tuca saliva L.; Taraxacum officinale 

 Weber; Zinnia elegans Jacq. CRUCI- 

 FERAE — Barbarea vulgaris R. Br.; 

 Brassica oleracea L.; Raphanus sativus 

 L. CUCURBITACEAE—Cucumis sa^ 

 tivus L. GRAMINEAE—Zea mays L. 

 LEGUM I NOSAE— Glycine max Merr.; 

 Lupinus hirsutus L.; Medicago saliva 

 L. LILIACEAE — Lilium formosanum 

 Stapf. PLANTAGINACEAE—Plan- 

 tago lanceolata L.; P. major L. POLY- 

 GON ACEAE — Rumex acetosella L. 

 SCROPHULARI ACEAE — Antirrhi- 

 num majus L. SOLAN ACEAE — Da- 

 tura stramonium L.; Lycopersicon escu- 

 lentum Mill.; Nicotiana glutinosa L.; N. 

 rustica L.; N. sylvestris Spegaz. and 

 Comes; N. labacum L.; Solanum nig- 

 rum L. 



Geographical distribution : United 

 States (Washington). 



Induced disease: In white clover, sys- 

 temic chlorotic mottling. In pea, experi- 

 mentally, originally infected leaves wilt 

 and die, remaining attached to the stem 

 by their shriveled petioles ; a few adjacent 

 lower leaves may also wilt and die; in 

 most varieties the top foliage remains 

 green, but in two varieties, Alaska and 

 Canada White, it mottles faintly; stems 

 show faint grayish discoloration; plants 

 are retarded in growth and dwarfed. If 

 pea-mottle virus, Marmor efficiens John- 

 son, is also present, a severe streak dis- 

 ease occurs. Intracellular inclusions ab- 

 sent. In mung bean, experimentally, 

 necrotic zonate local lesions. In cowpea, 

 experimentally, brown necrotic local 

 lesions in inoculated primary leaves, 

 diffuse areas of bleaching in uninoculated 

 trifoliate leaves. In bean, experimen- 

 tally, mild chlorotic mottling except in 

 three varieties that appear insusceptible 

 (varieties Ideal Market, Kentucky Won- 

 der, and Navy Robust). 



Transmission : By inoculation of ex- 

 pressed juice. Not by dodder, Cuscuta 

 campestris Yunck. {CONVOLVULA- 

 CEAE). Not by pea aphid, Macro- 

 siphum pisi Kalt. (APHIDIDAE). 

 No insect vector is known. 



Thermal inactivation : At 58 to 60° C in 

 10 minutes. 



Filterability : Passes Berkefeld W filter 

 candle. 



Other properties : Infectious in dilution 

 of 1 : 100,000. Not inactivated by storage 

 in juice of infected plants at about 25° C 

 for one month or by similar storage in 

 dried tissues of infected pea plants. 



Literature: Johnson, Phytopath., 32, 

 1942, 103-116; Pierce, Jour. Agr. Res., 51, 

 1935, 1017-1039. 



37. Marmor fastidiens spec. nov. 

 From Latin fastidiens, disdaining, in 

 reference to slight irregularities in the 

 reported host ranges of constituent 

 strains and failure of this virus to infect 

 certain varieties of the pea although it 



