FAMILY MARMORACEAE 



1193 



tj-pe cominoiily called yellow mosaic be- 

 cause of the distinctly yellow color of the 

 chlorotic areas in affected leaves. 



Transmission : By inoculation of ex- 

 pressed juice or of aqueous suspensions 

 of dried diseased tissues; not inactivated 

 by drj'ing in diseased tissues for at least 

 51 days. Xo insect vector is known. 



Literature: McKinney et al., Phyto- 

 path., 32, 1942, 331. 



42. Marmor abaca H. {loc. cit., 63). 

 P>om common name of host plant . 



Common name : Abacd bunchy-top 

 virus. 



Host: MUSACEAE—Musa. textilis 

 Nee, abaca (Manila hemp plant). 



Insusceptible species : MUSACEAE — 

 Musa sapientum L. vars. cincrea (Blanco) 

 Teodoro, co?npressa (Blanco) Teodoro, 

 lacatan (Blanco) Teodoro, and suaveolens 

 (Blanco) Teodoro; 71/. cavcndisJdi Lamb. 



Geographical distribution: Philippine 

 Islands. 



Induced disease : In abacd (Manila 

 hemp plant), chlorotic lines and spots 

 along veins of young leaves, followed by 

 growth of distorted leaves, successively 

 shorter, narrower, stiffer, and more 

 curled along their margins. The green 

 areas of mottled leaves, petioles, and leaf 

 sheaths are darker than normal. Newly 

 formed diseased leaves unfurl earh', but 

 lire short, producing the bunchy top that 

 is referred to in the common name of the 

 disease. 



Transmission : By the aphid, Penla- 

 lonia nigronervosa Coq. (APHIDI- 

 DAE), vector also of the apparentlj^ dis- 

 tinct banana bunchy-top virus of Aus- 

 tralia. The incubation period of abaca 

 bunchy-top virus in this aphid is between 

 24 and 48 hours in length. The j)rogeny 

 of viruliferous aphids do not receive the 

 virus directly, but must feed on diseased 

 plants before they can infect healthy 

 abacd. Transmission by inoculation of 

 expressed juice has not been demon- 

 strated. No soil transmission. 



Literature: Ocfemia, Am. .Jour. Bot., 



17, 1930, 1-18; Philippine Agriculturist, 

 32, 1934, 567-581. 



43. Marmor passiflorae H. {loc. cit., 

 77) . From New Latin Passi flora, generic 

 name of passion fruit. 



Conmion name: Passion-fruit woodi- 

 ness virus. 



Hosts : PASSIFLORACEAE—Passi- 

 flora edulis Sims, passion fruit; P. coeru- 

 lea L. Experimentally, also P. alba 

 Link and Otto. 



Insusceptible species: SOLAN A- 

 CEAE — Datura siramoniuvi L. ; Lycoper- 

 sicon escnlentxim Mill., tomato ; Nicoliana 

 gluiinosa L. ; A'', tabacum L., tobacco. 



Geographical distribution : Australia 

 (New South Wales, Queensland, Victoria) , 

 Kenja. 



Induced disease : In passion fruit, 

 growth checked ; leaves puckered, slightly 

 chlorotic or obscurely mottled, curled, 

 twisted, deformed. Clearing of veins has 

 been observed. Color of stems darker 

 green than normal in some places. Fruits 

 short or deformed, discolored, surface 

 sometimes roughened by cracks; so hard 

 as not to be cut through readily. Peri- 

 carp or rind of fruit abnormally thick. 

 Pulp deficient, color deepened. At tem- 

 peratures below 80° F, some abscission of 

 young chlorotic leaves; above 85° F, 

 masking of the disease in most plants. 



Transmission : By inserting cotton in 

 stem wound after soaking it in expressed 

 juice of diseased plant. By aphids, My- 

 zus persicae (Sulz.), Macrosiphum solani- 

 folii Ashm., and two dark-colored species 

 of the genus Aphis (APTIIDIDAE). 



Literature : Cobb, Agr. Gaz. New South 

 Wales, 12, 1901, 407-418; Noble, Jour, and 

 Proc. Roj'. Soc. New South Wales, 62, 

 1928, 79-98; Noble and Noble, ibid., 72, 

 1939, 293-317; Sinmionds, Queensland 

 Agr. Jour., 45, 1936, 322-330. 



44. Marmor flaccumfaciens H. {loc. 

 cit., 73). From hatm flacczis , flabby, and 

 facere, to make. 



Common names : Rose-wilt virus, rose 

 die back virus. 



