Varietal susceptibility of winter barley to Typhula incarnata Lasch and to barley yellow dwarf virus
- Cavelier, M. & Maroquin, C. (1980). Varietal susceptibility of winter barley to Typhula incarnata Lasch and to barley yellow dwarf virus. Bulletin des Recherches Agronomiques de Gembloux, 15: (4),
| Type | Journal Article |
| Year | 1980 |
| Title | Varietal susceptibility of winter barley to Typhula incarnata Lasch and to barley yellow dwarf virus |
| Journal | Bulletin des Recherches Agronomiques de Gembloux |
| Recnumber | 44 |
| Volume | 15 |
| Issue | 4 |
| Endnote Keywords | barley|susceptibility|transmission|varietal reactions|crop losses|cereals|plant diseases|pest resistance|pest control|control|agricultural entomology|plant pathology|barley yellow dwarf virus| |
| Abstract | The results are given of tests at Gembloux in Belgium on the relative susceptibility of 7 varieties of winter barley to the fungus disease Typhula incarnata and to strains of the barley yellow dwarf virus. The aphids Rhopalosiphum padi (L.) and Sitobion avenae (F.) were used to transmit the virus in the field; barley plants known to be infected and harbouring viruliferous aphids were replanted in plots of healthy plants. The number of tillers surviving to produce ears after inoculation with spores of T. incarnata was not a reliable indication of the severity of the probable crop losses to follow in each variety, owing to tolerance in some varieties that permitted normal or increased lengthening of ears on surviving tillers. The proportion of tillers surviving aphid-borne infection with the virus and producing ears did, however, follow the degree of susceptibility to the virus in each variety, except when the virus strain used was sufficiently severe to cause dwarfing of surviving tillers in all varieties, with no significant difference between them, which in turn reduced the yield; infected plants could therefore only compensate for the death of some tillers by increased stem and ear growth or larger numbers of grains per ear if the virus strain was mild enough not to cause dwarfing of tillers. ADDITIONAL ABSTRACT: Seven varieties were inoculated with T. incarnata, with barley yellow dwarf virus or with both. Reduction in the number of tillers due to the virus in comparison with uninoculated material was greater than that due to T. incarnata in Ager, Bessy, Bosquet, Capri and Gerbel; the reverse was true in Huzar and Robur. In Ager and Bessy, the decrease in grain yield due to both pathogens together was greater than the sum of the decrease caused by each pathogen singly. In Ager, Bessy, Huzar and Robur, infection by T. incarnata resulted in longer ears and a slightly longer stem, while infection by the virus resulted in similar decreases in the lengths of the stem and ear; in Bosquet, Capri and Gerbel, infection by T. incarnata resulted in no change in ear length and in shorter stems, and infection by the virus resulted in a greater shortening of the stem than of the ear. |
| Notes | Cited Reference Count: 5 ref. Journal article French 1 fig. |
| Author address | Station de Phytopathologie, Centre de Recherches Agronomiques, Gembloux, Belgium. |
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| Authors | Cavelier, M., Maroquin, C. |
