Abstract
The alfalfa stem nematode, Ditylenchus dipsaci (Kuhn) causes substantial damage to alfalfa crops in Iran every year. Rhizoglyphus robini Claparede is a polyphagous pest of bulbs, corms and tubers, but can be beneficial in some situations. This study examined the effect of R . robini as a predator of D . dipsaci in greenhouse conditions. Pot experiments showed that R . robini caused high mortality of D . dipsaci . The effect of R . robini density on mortality of D . dipsaci was mathematically modeled using the response surface methodology (RSM). These observations suggest that R . robini may contribute to regulate populations of this nematode.
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