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Resistance in potatoes and selected Solanum species to the aphid Myzus persicae

Resistance in potatoes and selected Solanum species to the aphid Myzus persicae
Resistance in potatoes and selected Solanum species to the aphid Myzus persicae

This study examined the nature and extent of host plant resistance in potatoes to Myzus persicae. This research was initiated because alternative control strategies were needed for an aphid which had already developed insecticide resistance. Commercially-grown potato cultivars were assessed for antibiotic resistance to iv. persicae in a culture room. The resistance rankings obtained were consistent for the following aphid metrics: maturation time, adult weight, embryo number and reproduction. Intrinsic rates of increase correlated with the above parameters, but this was not always the case for nymphal survival. The overall order of increasing resistance was: King Edward, Desirde, Hydra, Pentland Dell, Majestic, Omega, Culpn, Pentland Crown, Pentland Squire, Record, Maria Piper, Estima and Pentland Ivory. When aphid clone or culture plant was changed this had no effect on the relative resistance of the cultivars under test. Selected species of Solanum were found to have a resistance to M. persicae greater than, but overlapping with that found for cultivated potatoes. There were significant relationships between weight and reproduction and weight and embryo number of aphids. The relationship between embryo number and reproduction was examined by grouping aphids in weight batches; there was a strong relationship between these two variables. The resistance rankings of cultivars in a field cage obtained from aphid numbers and densities were in agreement with culture room assessments. In the open field numbers of m. persicae were low and variable, therefore no differences were found between cultivars. Plant age and leaf age had an effect on weight and embryo number of aphids examined in the field. The cultivar and leaf preferences of the four most common aphid species was determined. No evidence of antixenotic resistance in potato cultivars was observed in culture room or field. The causes of resistance to M. persicae were examined. There was a correlation (r2 = 0.49) between resistance in potato cultivars and globular hair density. None of the other factors examined gave significant correlations (straight hair number, alkaloid type and quantity and honeydew production).The significance of the resistance found in potatoes was discussed in relation to virus spread and its feasibility for incorporation into integrated control systems for M. persicae.

University of Southampton
Bintcliffe, Elizabeth Jane Beatrice
Bintcliffe, Elizabeth Jane Beatrice

Bintcliffe, Elizabeth Jane Beatrice (1981) Resistance in potatoes and selected Solanum species to the aphid Myzus persicae. University of Southampton, Doctoral Thesis.

Record type: Thesis (Doctoral)

Abstract

This study examined the nature and extent of host plant resistance in potatoes to Myzus persicae. This research was initiated because alternative control strategies were needed for an aphid which had already developed insecticide resistance. Commercially-grown potato cultivars were assessed for antibiotic resistance to iv. persicae in a culture room. The resistance rankings obtained were consistent for the following aphid metrics: maturation time, adult weight, embryo number and reproduction. Intrinsic rates of increase correlated with the above parameters, but this was not always the case for nymphal survival. The overall order of increasing resistance was: King Edward, Desirde, Hydra, Pentland Dell, Majestic, Omega, Culpn, Pentland Crown, Pentland Squire, Record, Maria Piper, Estima and Pentland Ivory. When aphid clone or culture plant was changed this had no effect on the relative resistance of the cultivars under test. Selected species of Solanum were found to have a resistance to M. persicae greater than, but overlapping with that found for cultivated potatoes. There were significant relationships between weight and reproduction and weight and embryo number of aphids. The relationship between embryo number and reproduction was examined by grouping aphids in weight batches; there was a strong relationship between these two variables. The resistance rankings of cultivars in a field cage obtained from aphid numbers and densities were in agreement with culture room assessments. In the open field numbers of m. persicae were low and variable, therefore no differences were found between cultivars. Plant age and leaf age had an effect on weight and embryo number of aphids examined in the field. The cultivar and leaf preferences of the four most common aphid species was determined. No evidence of antixenotic resistance in potato cultivars was observed in culture room or field. The causes of resistance to M. persicae were examined. There was a correlation (r2 = 0.49) between resistance in potato cultivars and globular hair density. None of the other factors examined gave significant correlations (straight hair number, alkaloid type and quantity and honeydew production).The significance of the resistance found in potatoes was discussed in relation to virus spread and its feasibility for incorporation into integrated control systems for M. persicae.

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Published date: 1981

Identifiers

Local EPrints ID: 459458
URI: http://eprints.soton.ac.uk/id/eprint/459458
PURE UUID: 9e0b2bf2-4212-4e45-a247-d22ae5241ad8

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Date deposited: 04 Jul 2022 17:10
Last modified: 04 Jul 2022 17:10

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Author: Elizabeth Jane Beatrice Bintcliffe

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