In 1989, maize grown for seed crop in the Po Valley, was aïfected by a syndrome of suspected viral etiology. During a survey at the beginning of September, the symptoms observed were chlorosis, chlorotic spotting with or without reddening, total reddening of leaves and complete drying of plants. Leaf and root samples from maize plants were collected in 5 localities of the Cremona Province and checked for virus presence by mechanical inoculation, aphid transmission (Rhopalosiphum padi) and serological tests (ELISA and immunosorbent electron microscopy). Barley yellow dwarf virus (BYDV) was isolated from 19 leaf samples out of 61 tested. From 4 of these, as well as from 2 root samples, 2 strains of BYDV were contemporarely isolated from the same sample. Maize dwarf mosaic virus was isolated from 3 of 61 samples, either alone or in association with one or more strains of BYDV. No obvious association was detected between symptoms obsened and the viruses isolated.
Ne1 1989 le coltare di mais da seme, nella provincia di Cremona, furono colpite da una sindrome a sospetta eziologia virale. In un sopralluogo effettuato all'inizio di settembre, i sintomi osservati furono: clorosi diffusa, picchiettatara clorotica, da sola o associata ad arrossamenti, totale arrossamento delle foglie, completo disseccamento della pianta. In 5 località vennero prelevati campioni di foglie e radici, utilizzati per la ricerca di eventuali virus mediante trasmissione con fidi (Rhopalosiphum padi), inoculazione meccanica su piante indicatrici e saggi sierologici (ELISA ed immunomicroscopia elettronica). Barley yellow dwarf virus (BYDV) fu isolato da 19 campioni di foglie su 61 saggiati; in 4 di questi e in 2 campioni di radici erano presenti contemporaneamente 2 ceppi del virus. Maize dwarf mosaic virus é stato isolato in 3 campioni su 61, da solo o in associazione a BYDV. Non è stata trovata un'associazione costante tra sintomi osservati e virus identifcati.
Indagini eziologiche ed epidemiologiche su gravi alterazioni del mais da seme in provincia di Cremona.
Piero CACIAGLI;
1992
Abstract
In 1989, maize grown for seed crop in the Po Valley, was aïfected by a syndrome of suspected viral etiology. During a survey at the beginning of September, the symptoms observed were chlorosis, chlorotic spotting with or without reddening, total reddening of leaves and complete drying of plants. Leaf and root samples from maize plants were collected in 5 localities of the Cremona Province and checked for virus presence by mechanical inoculation, aphid transmission (Rhopalosiphum padi) and serological tests (ELISA and immunosorbent electron microscopy). Barley yellow dwarf virus (BYDV) was isolated from 19 leaf samples out of 61 tested. From 4 of these, as well as from 2 root samples, 2 strains of BYDV were contemporarely isolated from the same sample. Maize dwarf mosaic virus was isolated from 3 of 61 samples, either alone or in association with one or more strains of BYDV. No obvious association was detected between symptoms obsened and the viruses isolated.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
