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- W297857259 abstract "A severe disease of lettuce cv Paris Island Cos occurred in winter crops for five consecutive years starting 2000, at Marathon, Attika, South Greece. Wilt of the lower leaves was observed, that progressively affected the upper leaves. Diseased plants became chlorotic, declined and died. An internal brown-black rot was observed along the infected stems, which started from the root area and progressed to the upper part of the stems. Isolates belonging to the genus Phytophthora derived from all infected plants. Oogonia were about 35-40 μm in diameter with amphigynous and paragynous antheridia, and the cultures contained aplerotic oospores. Sporangia were about 37-56 x 25-44 pm with length to width ratio mostly 1.4-1.7 and showed a broad opening after the release of zoospores. The maximum growth temperature for all isolates was 23°C. Hyphal swellings, occasionally empty and coiling of mycelium, were abundant in cultures. On the basis of morphological and physiological characteristics, the isolates were identified as Phytophthora porri. In pathogenicity tests on lettuce cultivars, inoculated with mycelial plugs, disease symptoms were similar to those observed in the field but disease appeared less severe. In artificial inoculations on various hosts, using P. porri disks, lettuce seedlings showed brown discoloration on the stem and roots. None of the isolates was highly pathogenic to seedlings of tomato hybrid Belladona, cauliflower cv Alpha, broccoli cv Ramoso Calabrese, red cabbage cv Langedijk Autumn, white cabbage cv Merveille d' Octobre, Brussels sprout cv Groninger, carrot cv Nantes or leek cv Blue Solaise. This is the first report of P. porri causing disease on lettuce outside Australia." @default.
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- W297857259 date "2006-01-01" @default.
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- W297857259 title "Phytophthora porri causing stem rot of lettuce in Greece: first report in Europe." @default.
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