Effects of cereal aphids feeding and barley yellow dwarf virus on 'Abe' wheat in the laboratory
1992
Thirakhupt, V. | Araya, J.E.
Damage caused to 'Abe' wheat, Triticum aestivum L. em Thell., caused by different numbers of barley yellow dwarf virus (BYDV, PAV isolate)-carrying, and virus-free bird cherry-oat aphids, Rhopalosiphum padi (L.), and English grain aphids, Sitobion avenae (F.), was evaluated at 20 +-1 degree C and 14:10 L:D. Caged plants were infested over 7 d at the 2-leaf, 2nd-node, or heading stages with 0, 5, 10, or 15 virus-free 2nd instar Rhopalisiphum padi, Sitobium avenae, or R. padi + S. avenae pairs. Aphids were added if necessary to maintain the required population level on a plant. Feeding by both R. padi and S. avenae reduced the 1,000-kernel weights of 'Abe', a susceptible wheat cultivar, particularly if they infected the plants with BYDV (PAV). The yield loss was more severe with increasing numbers of aphids from 5 to 15 and for paired R. padi + S. avenae infestations. Virus-free aphids also caused yield loss, particularly infestations of S. avenae at the head-filling stage. In general, seed number increased with increasing aphid infestation, but most of the smaller grains were shriveled. Feeding of virus-free aphid pairs caused an increase in the number of tillers produced, particularly when infestation occurred at the 2-leaf stage. BYDV-infected aphids did not produce a clear effect on the number of tillers
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