Apple leaf spot caused by Marssonina coronaria. An apple disease new for Italy [Malus pumila Mill. - Piedmont]
2003
Tamietti, G. (Turin Univ. (Italy). Dipartimento di Valorizzazione e Protezione delle Risorse Agroforestali)
English. In the early Summer 2001 and 2002, in a domestic orchard located in the Canavese (North-West of Piedmont, Italy), an unusual disease was observed on apple leaves. The disease causes on the upper leaf side irregular spots, often confluent, similar to a darken network with margins somewhat dendritic, brownish and becoming black with the time, and, on under leaf side, lesions smaller and with more definite margins. The heavily infected leaves became chlorotic and prematurely fall. Scattered acervuli, bearing conidia typical of the genus Marssonina, broke out from the diseased tissues. The fungus was isolated, grown on apple-leaf agar and inoculated, as conidia suspended in water, on the leaves of Golden Delicious apple shoots. Disease symptoms were reproduced and the pathogen reisolated. The fungus was identified as Marssonina coronaria (Ell. et J.J. Davis) J.J. Davis, teleomorph Diplocarpon mali Harada et al., the causal agent of the disease known as apple leaf blotch or apple leaf spot. The disease has not been reported in Western Europe
Show more [+] Less [-]Italian. Negli anni 2001 e 2002, ad inizio estate, una malattia del melo nuova per l'Italia e' stata osservata nel Canavese su piante presenti in un frutteto familiare. Essa e' caratterizzata da macchie reticolate, dendritiche, leggermente brune, talvolta confluenti, diffuse e nerastre in fase avanzata sulla pagina superiore e a bordo delimitato, poligonali, irregolari nella forma, della dimensione di 1-4 mm sulla pagina inferiore. Le foglie gravemente infette vanno incontro a clorosi e a distacco prematuro. Sui tessuti infetti sono presenti acervuli portanti conidi tipici del genere Marssonina. Il fungo e' stato isolato, coltivato su agar-foglie di melo, inoculato come sospensione conidica su foglie di Golden Delicious. Esso ha riprodotto i sintomi ed e' stato reisolato. L'agente e' stato identificato come Marssonina coronaria (Ell. et J.J. Davis) J.J. Davis, telomorfo Diplocarpon mali Harada et al., agente della malattia nota come apple leaf blotch o apple leaf spot. La malattia non risulta segnalata in Europa Occidentale
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