Leaf and Stem Spot Caused by Ramularia sphaeroidea on Purple and Lana Woollypod Vetch (Vicia spp.) Cover Crops in California

Plant Disease
S T KoikeJ Z Groenewald

Abstract

Vetches (Vicia spp.) are planted alone or in combination with other plants as cover crops in vegetable production areas of California. December 2001 through February 2003, purple (V. benghalensis) and lana woollypod (V. villosa subsp. varia) vetches in the Salinas Valley (Monterey County) developed a foliar disease. Symptoms were small (≤5 mm in diameter), circular to oblong, purple brown-to-red brown spots that were visible from the adaxial and abaxial leaf sides, and occurred lower in the plant canopy. White sporulation was visible in the spot centers. Stems were infected and had elongated, irregularly shaped, brown lesions that were <5 mm long and had white sporulation. When fungal masses or tissues from lesions were placed on acidified potato dextrose agar (LA-PDA), a fungus was consistently recovered. On LA-PDA, the isolates produced slow-growing (30 mm colony diameter in 45 days), irregularly raised, light pink and white colonies that produced dark exudates. The undersurfaces of cultures were gray black. The growth on lesions consisted of fascicles of conidiophores that were hyaline, smooth, flexuous, distinctly geniculate, and measured 20 to 120 × 2.5 to 6 µm. Conidia were hyaline, subglobose, smooth, aseptate, measured ...Continue Reading

Citations

Aug 30, 2016·Studies in Mycology·S I R VideiraP W Crous

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