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Damage potential and reproduction of Heterodera avenae on wheat and barley under Saudi field conditions

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image of Nematology
For more content, see Nematologica.

This study was conducted to determine the effect of H. avenae initial population densities (Pi) on the yield of wheat (two growing seasons) and barley (one season) and on nematode reproduction, under Saudi field conditions. At increasing Pi, H. avenae suppressed (P lessequal 0.05) the number of spikes, weight of spikes, weight of 1000 kernels, grain yield and straw yield of wheat and barley. Grain yields were reduced by 40 to 92% for wheat (during the two seasons) and 17 to 77% for barley. Straw yields were also reduced, by 50 to 85 for wheat and 30 to 77% for barley. As Pi increased, final populations of H. avenae increased (P lessequal 0.05) on both hosts, but the nematode reproduction factor (Rf) decreased. Significant negative linear regressions were obtained between H. avenae Pi and grain yield of wheat and barley. Final populations (Pf) were positively correlated with Pi on wheat and on barley. Rf was negatively correlated with Pi on wheat and barley.

Schadigungspotential und Vermehrung von Heterodera avenae an Weizen und Gerste unter Freilandbedingungen in Saudiarabien - Die vorliegende Untersuchung wurde durchgefuhrt, um die Wirkung unterschiedlicher Ausgangspopulationen (Pi) von Heterodera avenae auf den Ertrag von Weizen (zwei Vegetationsperioden) und Gerste (eine Vegetationsperiode) sowie auf die Vermehrung der Nematoden unter saudiarabishen Freilandbedingungen zu ermitteln. Bei steigender Pi verminderte (P lessequal 0.05) H. avenae die Anzahl der Ahren, das Ahrengewicht, das Tausendkorngewicht, den Korn- und den Strohertrag von Weizen und Gerste. Die Kornertrage wurden bei Weizen (zwei Vegetationsperioden) um 40-92% vermindert, bei Gerste um 17-77%. Auch die Strohertrage gingen zuruck, bei Weizen um 50-85% und bei Gerste um 30-77%. Mit zunehmender Pi stiegen die Endpopulationsdichten von H. avenae bei beiden Wirtspflanzen an (P lessequal 0.05), doch nahm der Vermehrungsfaktor (Rf) der Nematoden ab. Zwischen Pi von H. avenae und dem Kornertrag von Weizen und Gerste wurden signifikante negative Regressionen erhalten. Die Endpopulationen (Pf) waren an Weizen und Gerste positiv korreliert mit Pi. Rf war an Weizen und Gerste negativ korreliert mit Pi.


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