Volume 45 Number 2 Article 3
Year 1991 Month 4
Title: Comparison of Rating Methods for Bacterial Spot Resistance in Japanese-Type Plum
Authors: B.L. Topp, W.B. Sherman and R.E. Stall
Abstract:
Rating methods were compared in field experiments to determine usefulness in breeding
bacterial spot [Xanthomonas campestris pv.
pruni (Smith) Dye] resistant plums (Prunus
salicina Lindl. and hybrids). Methods compared
were measurements of number, size and incidence of leaf spots, percentage affected leaf
area and stem canker length.
Measurements of
spot size and spot number were equal in repeatability and overall correlation with other rating
methods but the correlations between these
methods were moderately low (r = 0.54 to 0.59)
indicating that they may be under separate
genetic control and that ranking of cultivars will
change with the rating method.
The measure
ment of percentage affected leaf area by use of
photographic standards was least repeatable
(t = 0.42) and stem canker length was most
repeatable (t = 0.58). The moderately high
broad sense heritabilities (0.42 to 0.58) obtained
for all rating methods indicates improvement of
bacterial spot resistance should be possible.
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