| Results and Discussion As can be seen in Table 1, about two thirds of the cultivars tested, including those which are most widely grown in Italy ('Capeiti', 'Appulo', 'Creso' and 'Trinakria') demonstrated to be resistant or moderately resistant to SBWM. On the contrary, many of the high-yielding semidwarf types launched during the past fifteen years showed to be totally inadeguate for cultivation in heavily SBWMV-infested soils. Extremely susceptible reactions, sometimes entailing severe stand losses, were observed especially for cultivars 'Filoppo', 'Lira', 'Orsini', 'Valforte', 'Valgerardo' and 'Valnova'. Varietal reactions to SBWM were quite consistent throughout the various trials. 'Valriccardo', whose behaviour was rated as 'resistant' in 1982, and as 'mildly susceptible' in 1984, was the only exception in this respect. Tall cultivars 'Capeiti', 'Norba' and 'Trinakria', as well as semidwarf 'Aldura', 'Creso' and 'Latino' showed high levels of SBWM-resistance in at least two experiments, and their use as parents in crossing programs is therefore recommended. References LARGE, E.C. 1954. Growth stages in cereals. Illustration of the Feekes scale. Plant. Pathol. 3: 128-129. RUBIES-AUTONELL, C. and V. VALLEGA. 1985. Soilborne wheat mosaic in the Lazio region. Inf. Fitopat. 35: 39-42. TODERI, G. 1969. Agronomical observations on soilborne wheat mosaic. Riv. Agron. 3: 178-182. VALLEGA, V. and C. RUBIES-AUTONELL. 1985. Reactions of Italian Triticum durum cultivars to soilborne wheat mosaic. Pl. Dis. 69: 64-66. WIESE, M.V. 1977. Soilborne wheat mosaic. In 'Compendium of wheat diseases', edited by The Am. Phytopath. Soc., St. Paul, Minnesota p.106. |
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