Concurrent Occurrence of Zygotylenchus guevarai and Fusarium oxysporum in Lovage Medicinal Plant Root and Rhizosphere and Control of the Nematode by Cadusafos Nematicide in Boyer-Ahmad County

One of the most devastating plant parasitic nematodes of the world is the root lesion nematode Zygotylenchus guevarai. This nematode was recorded from most of the countries in association with the roots of various hosts. In a lovage (Levisticum officinale ) farm with vascular wilt symptoms at Boyer-Ahmad county, the fungus Fusarium oxysporum was isolated from the infected roots and plant-parasitic nematode Zygotylenchus guevarai was also recovered from the roots and rhizospheric soil. After that, infected lovage plants with Z. guevarai were treated by 0.0, 0.05 and 0.1 g cadusafos (Rugby)/Kg of soil. The experiments were carried out in a completely randomized design with four replications under greenhouse conditions and distilled water treatment was used as control. Results showed that Rugby with concentration of 0.05 g/Kg of soil showed 81, 47.9 and 48 while concentration of 0.1 g/Kg of soil showed 91.4, 73.7 and 73.5 percent reduction of nematode population in soil, final population and reproduction factor, respectively. Also, Rugby with concentration of 0.05 and 0.1 g/Kg of soil showed 281 and 149 percent increase in nematode population in root, respectively.