The Effect of Initial Inoculum on the Reproduction of Heterodera latipons

The effect of the initial inoculum on the reproduction of the Mediterranean cereal cyst nematode Heterodera latipons on barley was studied. Two types, cysts or second stage juveniles (J2), of initial inoculum (Pi) were used in this investigation. Four inoculum levels of cysts (0, 5, 10, or 20/pot filled with 500 g clay loam soil) and J2 (0, 100, 200, or 400 J2s/ pot filled with 100 g clay loam soil) were used. The results indicated that the multiplication of H. latipons increased as the Pi increased while the reproduction factor decreased. The results also showed that increasing of initial inoculum, cysts or J2, of H. latipons resulted in decreasing the plant height, fresh and dry weight of both shoots and roots of barley.