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Disease Note.

First Report of Garlic Latent Virus in Ontario. L. W. Stobbs, Agriculture and Agri-Food Canada, Pest Management Reseach Center, Vineland Station, Box 6000, Ontario LOR 2E0. R. F. Cerkauskas, and J. G. VanSchagen. Agriculture and Agri-Food Canada, Pest Management Reseach Center, Vineland Station, Box 6000, Ontario LOR 2E0. Plant Dis. 80:343. Accepted for publication 16 January 1996. Copyright 1996 The American Phytopathological Society. DOI: 10.1094/PD-80-0343B.

Garlic latent virus (GLV) (I), also referred to as the garlic isolate of shallot latent virus (SLV-G) (2), was identified in a 0.5 ha commercial planting of garlic chives (Allium tuberosum Rottler ex Spreng.) near Boston, Ontario, in 1993 to 1994. The virus was not found in other oriental vegetable crops growing in the area. In June through early July, infected plants exhibited mild yellow interveinal streaking and mosaic mottling, with symptoms becoming less noticeable by mid-July. Virus was transmitted nonpersistently by Myzus persicae (Schultz) from garlic chives to garlic (A. sativum L.), leeks (A. porrum L), and onion (A. cepa L), known hosts for the virus. Characteristic necrotic lesions were present on inoculated leaves of Chenopodium amaranticolor Coste & Reyn and C. quinoa Willd. The absence of necrotic lesions on inoculated leaves of C. murale L., and the appearance of systemic necrotic spots instead of necrotic local lesions in Vicia faba L. as reported for the SLV-G strain by Van Dijk identify the isolate as being more closely related to GLV identified by the Japanese. The isolate reacted strongly in enzyme-linked immunosorbent assay with GLV antiserum (M. Fukami, Chiba Prefectural Agric. Exp. Stn,Chiba 266, Japan) and the common strain of SLV (Ac3B, P. Van Dijk, DLO Research Instit. Plant Prot. Wageningen, Netherlands) as described for the Japanese GLV strain (2). Antiserum to SLV-G (As 199-11, P. Van Dijk) was unavailable for testing. The cross-reacting Sint-Jan's onion latent virus (SjoLV) (2) was not present, and is not known to systemically infect A. tuberosum (2). Garlic latent virus is of particular concern in Ontario, where garlic chives are often grown in close proximity to large acreages of onions that could be infected through aphid vectors.

References: (1) Y W Lee et al. Ann. Phytopathol. Soc. Jpn 45:727. 1979 (2) P. Van Dijk Neih J. Plant Pathol. 99:233, 1993.