Abstract :
A survey of citrus cultivars in Israel in orchards where
Alternaria brown spot was common on Minneola tangelos
(mandarin x grapefruit), revealed the occurrence
of the disease as typical foliar and fruit lesions on Dancy
and Ellendale (mandarins), on Murcott tangor (mandarin
X sweet orange), on Nova and Idith (mandarin
hybrids), on Calamondin, and on Sunrise and Redblush
(grapefruit). Isolates of Alternaria alternata from each of
these hosts were proven to be pathogenic to Minneola
tangelo.
The host range of A, alternata pv. citri from Israel was
assayed by inoculating leaves of diverse citrus genotypes.
Several mandarins and their hybrids (Dancy, Kara, King,
Wilking, Satsuma, Minneola, Orlando, Mikhal, Idith,
Nova, Page, Murcott), grapefruit (Marsh seedless),
grapefruit x pummelo (Oroblanco), sweet orange
(Shamouti, Valencia, Washington navel) Calamondin,
and Volkamer citrus were susceptible. Several mandarins
and their hybrids (Clementine, Avana, Yafit, Ortanique),
Cleopatra, one sweet orange cultivar (Newhall), pummelo
(Chandler), lemon (Eureka), Rough lemon, Rangpur
lime, sweet lime, citron, limequat, sour orange,
Troyer citrange and Alemow were resistant
