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Rootstock influences postharvest anthracnose development in 'Hass' avocado

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Willingham, S.L., Pegg, K. G., Cooke, A.W., Coates, L. M., Langdon, P. W. B. and Dean, J.R. (2001) Rootstock influences postharvest anthracnose development in 'Hass' avocado. Australian Journal of Agricultural Research, 52 (10). pp. 1017-1022. ISSN 1836-0947


Article Link: https://doi.org/10.1071/AR01015


Rootstock studies conducted on ‘Hass’ avocado found that rootstock had a significant impact on postharvest anthracnose susceptibility. This is the first record of such an effect for avocado. The severity and incidence of anthracnose was significantly lower on ‘Hass’ grafted to ‘Velvick’ Guatemalan seedling rootstock compared with the ‘Duke 6’ Mexican seedling rootstock. Differences in anthracnose susceptibility were related to significant differences in concentrations of antifungal dienes in the leaves and mineral nutrients in the leaves and fruits from trees grafted to different rootstocks. Leaf diene concentrations were up to 1.5 times higher in ‘Hass’ trees on the ‘Velvick’ than the ‘Duke 6’ rootstock. In ungrafted nursery stock trees, diene concentrations were around 3 times higher in ‘Velvick’ than ‘Duke 6’ leaves. The ‘Velvick’/‘Hass’ combination also had a significantly lower leaf N concentration, a significantly higher fruit flesh Mn concentration, and significantly lower and higher leaf N/Ca and Ca+Mg/K ratios, respectively. A significant correlation (r = 0.82) between anthracnose severity and skin N/Ca ratio was also evident.

Item Type:Article
Subjects:Plant pests and diseases > Individual or types of plants or trees
Plant pests and diseases > Plant pathology
Live Archive:09 Jan 2024 02:26
Last Modified:10 Jan 2024 01:43

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