Download A Textbook of Plant Virus Diseases by Kenneth M. Smith PDF

By Kenneth M. Smith

ISBN-10: 0126513503

ISBN-13: 9780126513509

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I t is of the ringspot group b u t its relationships with members of this group are not known. 46 Aster Teltows Differential h o s t s · Phaseolus vulgaris, var. Scotia a n d Nicotiana tabacum, Turkish. These plants react with acute a n d systemic ringspot symptoms. D i s e a s e p r o d u c e d . Fraxinus americana. White ash. Graft transmission produced chlorotic lesions on the leaves, line patterns a n d mottle, also chlorophyllretaining spots a n d rings; reddish flecks a n d ringspots. Leaf deformations developed occasionally, with dieback of terminal shoots (Hibben, 1966).

A, after B. D. Harrison; B, after F. M. Gerola) 39 Arabis Mosaic Virus TRANSMISSION. T h e virus is mechanically transmissible a n d the vectors are nematode worms. T h e following species have been incriminated: Xiphinema diversicaudatum (Mikoletzky) T h o r n e a n d X. coxi Tarjan (Harrison a n d C a d m a n , 1959 ; Fritzsche, 1968). T h e Forsythia strain of the virus is transmitted by the dodder species Cuscuta subinclusa and C. californica (Schmelzer, i962-63a). PROPERTIES OF T H E VIRUS IN PLANT SAP Stability.

During midsummer the bark becomes necrotic, growth stops and necrotic areas m a y develop on the leaves. T h e Spy 227 scions die during the a u t u m n or winter months with severe phloem necrosis (Gilmer, 1962). H o s t r a n g e . M a n y ornamental species of Malus and varieties of ornamental crab apple are susceptible. G e o g r a p h i c a l d i s t r i b u t i o n . , England a n d Switzerland a n d probably wherever apples are grown commercially (Posnette and Cropley, 1963a). Control. Exposure to dry heat at 38°G for seven days, following preheating at 35°C for seven days (Welsh a n d Nyland, 1965).

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