Resistance Trials of Some Apple Rootstock Varieties to<i>Phytophthora Cactorum</i>(L. &amp; C.) Schroet.

Sewell, G. W. F.; Wilson, J. F.

doi:10.1080/00221589.1959.11513943

Cited by 34 publications

(16 citation statements)

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“…Nevertheless, all isolates were virulent causing typical lesions. These results are similar to those reported by Sewell and Wilson (1959) and Aldwinckle et al (1975). Variable pathogenecity of P. cactorum isolates might explain the diverse susceptibility of the same clones reported from different region (Sewell and Wilson 1959).…”

Section: Discussionsupporting

confidence: 81%

“…These results are similar to those reported by Sewell and Wilson (1959) and Aldwinckle et al (1975). Variable pathogenecity of P. cactorum isolates might explain the diverse susceptibility of the same clones reported from different region (Sewell and Wilson 1959). Even if significant differences in pathogenecity and in interaction between rootstock and isolates were found in this study the overall classification of rootstocks into susceptibility groups was similar for the four isolates used.…”

Section: Discussionsupporting

confidence: 76%

“…The inoculation of excised twigs is a useful technique for determining the susceptibility to P. cactorum (; Sewell and Wilson 1959;Borecki and Milliikam 1969;Jeffers et al 1981;Matheron and Porchas 1996). However, it should be considered as a test for relative and not absolute levels of disease because resistance of excised phloem tissue to colonization by P. cactorum may be altered by changes in the physiology of the tissue caused by the excision from the growing plant.…”

Section: Discussionmentioning

confidence: 99%

“…The use of rootstocks resistant to crown rot diseases is a good management practice. Significant differences in susceptibility of apple rootstocks were reported by Sewell and Wilson (1959) and Utkhede and Quamme (1988) and only a few apple rootstocks were resistant to crown rot caused by P. cactorum. However, rootstocks considered as resistant such as Malling 9 (M.9) and Malling 44 (M.44) are not immune.…”

mentioning

confidence: 99%

“…and for evaluating the relative pathogenecity of isolates of Phytophthora spp. have been developed (Sewell and Wilson 1959;Borecki and Milliikam 1969;Jeffers et al 1981;Matheron and Porchas 1996). Commonly used methods include artificial inoculation of young trees in pots or in the field and inoculation of abscised stems in the laboratory.…”

mentioning

confidence: 99%

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Relative resistance of newly released apple rootstocks to Phytophthora cactorum

Carisse¹,

Khanizadeh²

2006

Can. J. Plant Sci.

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Carisse, O. and Khanizadeh, S. 2006. Relative resistance of newly released apple rootstocks to Phytophthora cactorum. . New rootstocks from series SJM (St-Jean-Morden) and SJP84 (ST-Jean-1984) have been evaluated for agronomic qualities since 1970 and 1975, respectively. As a result of the evaluation, seven and nine rootstocks from the SJM and SJP84 series, respectively, were selected. However, these were not evaluated for crown rot resistance. Excised shoot assay was used to evaluate resistance of 22 apple rootstocks to crown rot caused by Phytophthora cactorum (Leb. and Cohn.) Schroet. The pathogenicity of four isolates of P. cactorum to apple rootstocks was confirmed using the same excised twig assay. For both tests, relative lesion length was used as a measure of susceptibility. The analysis of variance showed that there was a significant effect of rootstocks, isolate and the interaction between rootstock and isolate. In general, apple rootstocks were more susceptible to isolate PC04-02 followed by isolates PC04-03 and PC04-01 and less susceptible to isolate PC04-04. The selection SJM189 was the least susceptible to P. cactorum and SJP84-5162 and SJM15 were the most susceptible suggesting that these rootstocks may not be suitable in orchards with favourable conditions to P. cactorum infection. Excised twigs of the SJP84-5180, SJP84-5189, SJP84-5174, O.3, SJP84-5230, O.3A, SJP84-5198, SJM167 and M.44 showed low to moderate susceptibility, whereas, rootstocks SJP84-5231, SJM150 and M.26 showed moderate susceptibility to P. cactorum. Rootstocks SJM188, SJP84-5217, MM.111, SJM127, SJP84-5218 and MM.106 showed high susceptibility to P. cactorum. The present results confirmed that none of the released or commercial rootstocks are completely resistant to P. cactorum and an integrated approach including resistance, chemical control and cultural practices is recommended to manage P. cactorum in apple orchards. De cette évaluation, sept porte-greffes de la série SJM et neuf de la série SJP84 ont été choisis. Toutefois, ces porte-greffes n'ont pas été évalués pour leur résistance à la pourriture du collet. Un test sur pousses excisées a été utilisé pour évaluer la résistance de 22 porte-greffes de pommier à la pourriture du collet causée par Phytophthora cactorum (Leb. and Cohn.) Schroet. Ce test a également été utilisé pour évaluer la pathogénécité de quatre isolats de P. cactorum. Dans les deux cas, la longueur relative des lésions a été utilisée comme mesure de la sensibilité des porte-greffes. Les résultats de l'analyse de variance ont indiqué qu'il y avait un effet significatif du porte-greffe, de l'isolat et de l'interaction porte-greffe-isolat sur la longueur des lésions. En général, les porte-greffes étaient plus sensibles à PC04-02 suivi des isolats PC04-03 et PC04-01 et moins sensibles à l'isolat PC04-04. Le porte-greffe SJM189 était le moins sensible à P. cactorum. Les porte-greffes SJP84-5162 et SJM15 étaient les plus sensibles, indiquant que ces porte-greffes ne sont probablement pas recommandables pour ...

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Section: Discussionsupporting

confidence: 81%

Section: Discussionsupporting

confidence: 76%

Section: Discussionmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Relative resistance of newly released apple rootstocks to Phytophthora cactorum

Carisse¹,

Khanizadeh²

2006

Can. J. Plant Sci.

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Breeding Apple Rootstocks

Cummins¹,

Aldwinckle²

1983

Plant Breeding Reviews

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Effects of fungicides on apple crown rot caused by Phytophthora cactorum

Utkhede

1984

Pestic. Sci.

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The mycelial growth of Phytophthora cactorum on corn meal agar was completely inhibited by metalaxyl or mancozeb at 50 or 100 μg ml−1, but not by fosetyl‐aluminium at the same concentrations. Soil drenches with metalaxyl, followed by metalaxyl+mancozeb, around the base of naturally infected trees under orchard conditions, prevented the growth of P. cactorum in the infected bark of the tree. Soil drenchs with metalaxyl, followed by metalaxyl+mancozeb, also prevented the infection of apple trees with P. cactorum under orchard conditions. The trunk circumference and spur length were not significantly affected by any of the fungicide treatments in all the trials over 2 years, except in one of the four orchards used in the study. Soil drench with metalaxyl alone, or followed by metalaxyl+mancozeb, may provide an effective control method for crown rot of apple trees.

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Resistance Trials of Some Apple Rootstock Varieties toPhytophthora Cactorum(L. & C.) Schroet.

Cited by 34 publications

References 6 publications

Relative resistance of newly released apple rootstocks to Phytophthora cactorum

Relative resistance of newly released apple rootstocks to Phytophthora cactorum

Breeding Apple Rootstocks

Effects of fungicides on apple crown rot caused by Phytophthora cactorum

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