تأثير مستويات مختلفة من اللقاح المعدي لنيماتودا ثاليل حبوب القمح Anguina tritici Steinb في إنتاجية الشعير

Abstract EN

An experiment was conducted in pots under field conditions to investigate the relationship between inoculum density and infection level of seed-gall nematode and barley yield losses.

Inoculation was done at sowing with 125, 250.

500 and 1000 juvcniles/100 g soil, as compared to a non inoculated treatment.

Two cultivars of the six rows barley (Rihan 3 and I'urat I), and two of the two-rows barley (Tadmor and Zanbaka) were used.

Results indicated that the lowest inoculum density of the nematode (125 j/lOOg soil) influenced infection level and grain loss.

Severity of infection increased with every increase in inoculum density.

However, yield reduction slightly increased with increase in inoculum density (26.1, 27.5, 31.6 and 36.8%) when 125, 250, 500 and 1000 J./I00 g soil was used, respectively.

Results also showed that incidcncc of infection varied significantly among the cultivars tested, where "Rihan 3" was less affected (22.8%) as compared to the other cultivars Furat I, Tadmor and Zanbaka (36.7.

41 and 47.7% respectively).