Finding of lettuce big vein virus in Czechoslovakia

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Abstract
Big vein disease occurring on lettuce plants cv. ‘Pražan’ was identified and the susceptibility to this disease was tested on 9 lettuce cultivars of foreign origin. Lettuce big vein virus was confirmed to be the cause of the disease. The transmission of the LBVV by the fungusOlpidium brassicae (Wor.)Dang., the sporangia of which were found by microscopy in the cells of surface tissues of lettuce roots, was experimentally proved. Rod-like particles, the average length of which was estimated at 244 nm, were found in the roots of diseased plants. LBW transmission by mechanical inoculation and by aphids could not be proved. Byla provedena identifikace zilkovitosti salátu, vyskytujici se na salátu odrůdy Prazan a prověfena vnimavost 9ti zahranicnich odrůd salátu k této chorobé. Jako původce onemocněni byl zjištěn virus zilkovitosti salátu (Lettuce big vein virus — LBVV). Experimentálně byl prokázán pfenos LBVV houbouOlpidium brassicae Wor. Dang., jejiz sporangia byla mikroskopicky zjistěna v povrchovych buiikách pletiv kofene salátu. V preparátech zhotovenych z kofenů salátu byly zjištěny tycinkovité cástice LBVV jejichz průměrná délka byla stanovena na 244 nm. Prenos LBVV mechanickou inokulaci a savym hmyzem nebyl prokázán.