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Boron (B) deficiency symptoms often appear in the reproductive tissues of apple ( Malus domestica  Borkh.) and pear ( Pyrus communis  L.) without attendant vegetative symptoms. The primary symptoms are blossom blast, and internal and external cork in fruit. Leaf analysis is the principal diagnostic procedure for evaluating tree B status in Washington orchards. Because flower cluster and fruitlet B contents are influenced by soil moisture availability during the previous autumn, variability in fall precipitation limits the ability of leaf analysis to accurately predict tree B demands the following spring. In the 1960s, Woodbridge and Crandall of Washington State University reported that the B content of apple and pear buds was constant during the winter. The objective of the current study is to determine if winter bud analysis is an accurate predictor of flower and fruitlet B status. Temporal changes in bud, flower cluster, and fruit B are presented for two apple orchards and one pear orchard during the period 1988 to present, as well as the relationships between bud, flower cluster and fruit B concentrations.

TEMPORAL CHANGES IN BORON CONTENT OF SELECTED APPLE AND PEAR TISSUES