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Two field experiments were conducted to assess peach (Prurus persica L.) cultivar susceptibility to the three Botryosphaeria spp. that cause peach tree fungal gummosis. Inoculated trees were evaluated for disease severity by rating gum exudation, vascular discoloration, and fungal colonization. Each severity measurement yielded a different rank ordering of cultivars for susceptibility. However, in a greenhouse study, these same measurements gave consistent rankings for aggressiveness of the fungal species on `Blake'. Despite large differences in disease severity in the greenhouse study, none of the severity measures were correlated with tree growth after inoculation. The only factor significantly correlated with growth rate of the trees after inoculation was growth rate before inoculation.
Abstract
Dormant cuttings of muscadine grape, Vitis rotundifolia Michx., rooted best early in the dormant season, although root quality was poor and the percentage rooting was low. Large-diameter cuttings rooted better than small-diameter cuttings. A high percentage of cuttings with aerial roots produced additional root growth. Medium heating was necessary for root formation. No significant rooting response was observed with indolebutyric acid (IBA), (2-chloroethyl) phosphonic acid (ethephon), precallousing, sucrose treatments, or with mallet cuttings.