A set of 61 synthetic hexaploid wheats derived from crosses between Triticum dicoccum (Schrank) and Aegilops tauschii ((Cross.) Schmal.) were together with their 22 T. dicoccum parents evaluated in the field for Russian wheat aphid (RWA), Diuraphis noxia (Mordvilko) resistance. The plants were grown in one m. double rows, in paired plots. One plot was infested with RWA, while the other was insecticide treated. The plants were artificially infested with RWA three times starting at seedling stage. Damage was determined on a 1-6 scale. According to the damage score 15 synthetics derived from nine different T. dicoccum parents showed evidence of moderate resistance, while the resistance level in the T. dicoccum was generally higher. At maturity the height of the plants was measured and the plants harvested. Total biomass, number of spikes, total yield, and 1000 kernel weight was determined. By comparing RWA infested plots with insecticide treated plots, an indication of the aphids influence on yield in field situation was obtained for each entry.
Species 1: Homoptera Aphididae Diuraphis noxia (Russian wheat aphid)
Keywords: plant resistance, synthetic hexaploid wheat
The ESA 2001 Annual Meeting - 2001: An Entomological Odyssey of ESA