Host Range and Symptomatology
Host range is wide: infects naturally many species of wild and cultivated monocotyledonous and dicotyledonous plants. An isolate from Robinia pseudoacacia infected 76 species in 29 dicotyledonous families after mechanical inoculation (Schmelzer, 1963). It is reported to infect the roots of the gymnosperm, Picea sitchensis. Nearly all commonly used herbaceous test plants are susceptible.
Diagnostic species
Chenopodium amaranticolor and C. quinoa. Chlorotic or necrotic local lesions (Fig.1); systemic necrosis or chlorotic mottle (Fig.2).
Nicotiana rustica and N. tabacum cvs. White Burley or Xanthi-nc (tobacco). Local chlorotic or necrotic spots or rings (Fig.3); systemic spots, rings and line patterns with variable amounts of necrosis (Fig.4). Leaves produced later appear normal but contain virus.
Phaseolus vulgaris cv. The Prince (French bean). In winter in the U.K., dark brown local lesions c. 2 mm in diameter (Fig.5), in summer chlorotic lesions or none; systemic chlorotic mottle with variable amounts of necrosis and distortion.
Petunia hybrida. Chlorotic local lesions sometimes with brown necrotic margins; systemic veinal chlorosis or necrosis. Leaves produced subsequently are symptomless but contain virus.
Propagation species
Nicotiana rustica is a suitable plant for maintaining cultures; N. clevelandii and Petunia hybrida are good sources of virus for purification.
Assay species
Chenopodium amaranticolor is the most reliable local-lesion host. C. quinoa, Cucumis sativus (cucumber) and Brassica rapa (turnip) are convenient ‘bait plants’ in nematode transmission experiments.
Host Range and SymptomatologyHost range is wide: infects naturally many species of wild and cultivated monocotyledonous and dicotyledonous plants. An isolate from Robinia pseudoacacia infected 76 species in 29 dicotyledonous families after mechanical inoculation (Schmelzer, 1963). It is reported to infect the roots of the gymnosperm, Picea sitchensis. Nearly all commonly used herbaceous test plants are susceptible.Diagnostic speciesChenopodium amaranticolor and C. quinoa. Chlorotic or necrotic local lesions (Fig.1); systemic necrosis or chlorotic mottle (Fig.2).Nicotiana rustica and N. tabacum cvs. White Burley or Xanthi-nc (tobacco). Local chlorotic or necrotic spots or rings (Fig.3); systemic spots, rings and line patterns with variable amounts of necrosis (Fig.4). Leaves produced later appear normal but contain virus.Phaseolus vulgaris cv. The Prince (French bean). In winter in the U.K., dark brown local lesions c. 2 mm in diameter (Fig.5), in summer chlorotic lesions or none; systemic chlorotic mottle with variable amounts of necrosis and distortion.Petunia hybrida. Chlorotic local lesions sometimes with brown necrotic margins; systemic veinal chlorosis or necrosis. Leaves produced subsequently are symptomless but contain virus.Propagation speciesNicotiana rustica is a suitable plant for maintaining cultures; N. clevelandii and Petunia hybrida are good sources of virus for purification.Assay speciesChenopodium amaranticolor is the most reliable local-lesion host. C. quinoa, Cucumis sativus (cucumber) and Brassica rapa (turnip) are convenient ‘bait plants’ in nematode transmission experiments.
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