تحديد مصادر العدوى الأولية لمرض التبقع السسبتوري على القمح في سورية

الملخص EN

The primary sources of infection of septoria leaf blotch studied under field conditions in research plots in the cereal disease fields at the main station,tel hadya, of the international center for agricultural research in the dry areas (icarda), in northern Syria from winter till next summer during the wheat cultivation for two seasons (1995/96-1996/97).

spores released from infected wheat stubble were trapped for identification and quantification by using two spore trap methods: wooden boxes trap (locally made) and burkard spores trap.

data of spore trapping were correlated with climatical changes during the experiment.

the first record of the occurrence of symptoms on volunteer wheat was also correlated with the different kinds of spores trapped.

in addition to pycnidiospores of s.

tritici, two-celled hyaline ascospores of mycosphaerella sp.

were recorded.

at germination, the ascospores yielded conidiospores of cladosporium sp..

it thus appears that the primary source of inoculum for septoria leaf blotch under northern Syrian conditions originate mainly from pycnidiospores released from pycnidia on infected stubble left in the field from previous season.

there is no indication of the existence of the sexual stage of septoria leaf blotch (mycosphaerella graminicola) on wheat in northern Syria.