The response of 160 European pear genotypes to the attacks of Cacopsylla pyri in natural conditions of infestation was studied in the ex situ germplasm collection of the IVALSA Institute - CNR located in Follonica (Grosseto, Italy) during three years. ANOVA showed that both the year and the period of survey have a significant effect upon pear infestation assessed by seven variables. The overall average values of the studied accessions for the variables taken into account were used for grouping the genotypes into 5 putative classes of susceptibility by cluster analysis. Four variables (number of colonies, small nymphs, large nymphs and length of the colonies) selected on the basis of discriminant analysis allowed us to classify 70% of the cultivars into the correct group of susceptibility by jackknifed classification matrix. Taking into account the mean values of the variables and their upper and lower limits all the genotypes were grouped into 5 different classes of susceptibility. On the whole, the number of highly tolerant or resistant cultivars were 8.1% of the investigate genotypes; part of them were ancient cultivars of Italian origin as 'Eletta Morettini', 'Fiorenza', 'Gentile', 'Moscatellina', 'Pera Volpina VP7', 'Precoce di Cassano' and 'Precoce di Masi', but there were also the French 'Notaire Lepin' and 'President Loubet', the German 'Forelle' and the American 'Starking Delicious'. The remaining 91.9% of the germplasm collection showed different levels of susceptibility to psylla attack. The largest part of the genotypes (56.9%) was identified as slightly susceptible, often with minor infestation (that is some isolated larvae, few colonies and reduced honeydew) only in one or two out of three years. Several cultivars (46.3%) were scored as susceptible, suffering medium or high damage, including the widespread cultivated 'Conference', 'Doyenne du Cornice', 'Highland"Cure', 'Etrusca', 'Kaiser', and 'William', these last 3 being classified as highly susceptible. The influence of the environment and growth condition of trees are discussed together with screening methods applied for the evaluation of pear susceptibility to psylla attack reported in world literature.

Susceptibility of European pear germplasm to Cacopsylla pyri under Mediterranean climatic conditions / Stefania Nin; Alessio Ferri; Patrizia Sacchetti; Enzo Picardi; Claudio Cantini; Edgardo Giordani. - In: SCIENTIA HORTICULTURAE. - ISSN 0304-4238. - STAMPA. - 185:(2015), pp. 151-161. [10.1016/j.scienta.2015.01.031]

Susceptibility of European pear germplasm to Cacopsylla pyri under Mediterranean climatic conditions

NIN, STEFANIA;FERRI, ALESSIO;SACCHETTI, PATRIZIA;GIORDANI, EDGARDO
2015

Abstract

The response of 160 European pear genotypes to the attacks of Cacopsylla pyri in natural conditions of infestation was studied in the ex situ germplasm collection of the IVALSA Institute - CNR located in Follonica (Grosseto, Italy) during three years. ANOVA showed that both the year and the period of survey have a significant effect upon pear infestation assessed by seven variables. The overall average values of the studied accessions for the variables taken into account were used for grouping the genotypes into 5 putative classes of susceptibility by cluster analysis. Four variables (number of colonies, small nymphs, large nymphs and length of the colonies) selected on the basis of discriminant analysis allowed us to classify 70% of the cultivars into the correct group of susceptibility by jackknifed classification matrix. Taking into account the mean values of the variables and their upper and lower limits all the genotypes were grouped into 5 different classes of susceptibility. On the whole, the number of highly tolerant or resistant cultivars were 8.1% of the investigate genotypes; part of them were ancient cultivars of Italian origin as 'Eletta Morettini', 'Fiorenza', 'Gentile', 'Moscatellina', 'Pera Volpina VP7', 'Precoce di Cassano' and 'Precoce di Masi', but there were also the French 'Notaire Lepin' and 'President Loubet', the German 'Forelle' and the American 'Starking Delicious'. The remaining 91.9% of the germplasm collection showed different levels of susceptibility to psylla attack. The largest part of the genotypes (56.9%) was identified as slightly susceptible, often with minor infestation (that is some isolated larvae, few colonies and reduced honeydew) only in one or two out of three years. Several cultivars (46.3%) were scored as susceptible, suffering medium or high damage, including the widespread cultivated 'Conference', 'Doyenne du Cornice', 'Highland"Cure', 'Etrusca', 'Kaiser', and 'William', these last 3 being classified as highly susceptible. The influence of the environment and growth condition of trees are discussed together with screening methods applied for the evaluation of pear susceptibility to psylla attack reported in world literature.
2015
185
151
161
Stefania Nin; Alessio Ferri; Patrizia Sacchetti; Enzo Picardi; Claudio Cantini; Edgardo Giordani
File in questo prodotto:
File Dimensione Formato  
2015_Susceptibility of European pear germplasm to Cacopsylla pyri under Mediterranean climatic conditions.pdf

Accesso chiuso

Descrizione: Articolo completo in versione editoriale
Tipologia: Pdf editoriale (Version of record)
Licenza: DRM non definito
Dimensione 996.96 kB
Formato Adobe PDF
996.96 kB Adobe PDF   Richiedi una copia

I documenti in FLORE sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificatore per citare o creare un link a questa risorsa: https://hdl.handle.net/2158/975417
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 4
  • ???jsp.display-item.citation.isi??? 3
social impact