Reduced incidence of lesser peachtree borer and Leucostoma canker in peach-almond hybrids
1993
Puterka, G.J. | Scorza, R. | Brown, M.W.
Damage by lesser peachtree borer (LPB) (Synanthedon picdpes Grote & Robinson) and Leucostoma canker that had accumulated during 6 (Orchard A) and 8 (Orchard B) years were compared in peach Prunus persica L.) and peachalmond [P. amygdalus (Mill.) D. A. Webb] hybrids. Afterward, the main trunk and scaffold-limbs of the trees received 10 wounds 26 mm in diameter and a subset of these trees in Orchard A had wounds inoculated with Leucostoma persoonii Hohn. Before wounding, Leucostoma canker infection and LPB infestations that had accumulated for 6 to 8 years on peach-almond hybrids was approximately equal 60% and 98% less than on peach in Orchard A and B, respectively. One month after wounding the trees, no significant differences in Leucostoma canker infection and LPB infestations were found among the peach-almond hybrids, treated or not treated with L persoonii, or untreated peach. Yet, Leucostoma-treated and untreated peach-almond hybrids had 33% and 25% less leucostoma canker and LPB,respectively,when compared with Leucostoma-treated peach. Ten months after wounding, peach-almond hybrids treated with L persoonii still had significantly less Leucostoma canker (60%) and LPB (25%) when compared with Leucostoma-treated peach. Wound gumming and wound closure rates seemed to influence the degree of LPB infestation and Leucostoma canker. Based on these data, peach-almond hybrids could be valuable sources of resistance to LPB and Leucostoma canker.
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