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Evaluation of Field Trees for Resistance to Phytophthora cinnamomi by Means of the Detached Root Technique

M. de V. van der Merwe, Erna M C Maas, J. M. Kotzé

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Abstract

Avocado trees selected by SAAGA for exceptional growth under apparent root rot pressure were evaluated for resistance by means of the detached root technique. As means of comparison root segments from rootstocks such as G755, Duke 7 and Edranol with known responses towards Phytophthora cinnamomi were used. Nine of the 34 trees evaluated were as resistant as G755 and six were significantly more resistant than Duke 7. Most of the trees, ie 25 were significantly more resistant than Edranol.

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What this paper is about

Avocado trees selected by SAAGA for exceptional growth under apparent root rot pressure were evaluated for resistance by means of the detached root technique. As means of comparison root segments from rootstocks such as G755, Duke 7 and Edranol with known responses towards Phytophthora cinnamomi were used. Nine of the 34 trees evaluated were as resistant as G755 and six were significantly more resistant than Duke 7. Most of the trees, ie 25 were significantly more resistant than Edranol.

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Available abstract

Avocado trees selected by SAAGA for exceptional growth under apparent root rot pressure were evaluated for resistance by means of the detached root technique. As means of comparison root segments from rootstocks such as G755, Duke 7 and Edranol with known responses towards Phytophthora cinnamomi were used. Nine of the 34 trees evaluated were as resistant as G755 and six were significantly more resistant than Duke 7. Most of the trees, ie 25 were significantly more resistant than Edranol.

Key concepts: Phytophthora cinnamomi, Rootstock, Horticulture, Phytophthora, Root rot, Biology, Resistance (ecology), Root (linguistics)

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