Fire blight on pear, a new disease in Israel.
In early May 1985, symptoms characteristic of this disease were observed in an orchard in the Upper Jordan Valley of Israel. An extensive survey revealed similar symptoms in 8 other pear orchards throughout the country. Inoculation of immature fruits with suspected isolates produced whitish bacterial exudates 76 h after infection. Pathogenic isolates induced a hypersensitive reaction in tobacco leaves. In agglutination assays and dot-ELISA, the 8 Israeli isolates reacted in a manner identical to that of the reference cultures with 3 sera (2 produced against confirmed isolates of Erwinia amylovora and 1 against an Israeli suspect).