ISHS Acta Horticulturae 217: IV International Workshop on Fire Blight
SHOOT AND BLOSSOM SUSCEPTIBILITY TO FIREBLIGHT OF APPLE CULTIVARS |
| Authors: | M. LE LEZEC, J.P. PAULIN, P. LECOMTE |
| Abstract:
The fireblight susceptibility of 75 named cv. of apple and of two Malus species has been evaluated through artificial inoculation, during 3 or 4 consecutive years for shoots inoculation and 2 consecutive years for flowers inoculation. The results of shoot inoculations are assessed in 5 classes of a varietal index of susceptibility (V.I.S.) :
which takes into account the proportion of blighted shoots, and the progression of the disease after inoculation (LE LEZEC and PAULIN, 1984). The results of flower inoculations are assessed in 5 classes (same limits as above) which are the actual percentages of infected blossoms after inoculation (=Varietal Receptivity). A table shows the rating of the cv. and sp. according to these two assessments. The correlation between the two indexes is usually poor (0.48 ≤ r ≤ 0.25). Nevertheless it appears that this classification fits with the rating of field susceptibility as previously assessed in the same conditions, with few exceptions. The relations between different ratings are discussed. | |
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