See more from this Session: Breeding for Resistance to Biotic Stress
PHY367WRF had less severe galling and fewer RKN in the soil than did the susceptible check, ‘PHY375WRF’. Both Telone and Temik reduced the galling of both varieties, but the galling of PHY367WRF without any treatment was as low as PHY375WRF with Telone. Averaged over the three locations and all treatments, PHY367WRF had 72% fewer RKN in the soil at the end of the season.
Despite significant differences in root galling and ending RKN levels, differences in yield were observed only at Clarkton, MO. The difference in yield between varieties was not significant in the Telone strip, but it was highly significant in the other two strips with PHY367WRF yielding 19% more than PHY375WRF in the untreated strip.
This study indicated that the moderate RKN resistance in PHY367WRF was equivalent to Telone and Temik treatments in reducing galling and it surpassed Telone in reducing RKN levels in the soil. There was only negligible benefit to treating PHY367WRF with any nematicide treatment. Avicta had no significant effect in this study, but nematicide seed treatment may be useful to enhance the durability of resistance.