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Field evaluation of Edovum puttleri Grissel (Hym., Eulophidae) on eggs of Leptinotarsa decemlineata Say (Col., Chrysomelidae) in Central Italy
Author(s) -
Pucci C.,
Dominici M.
Publication year - 1988
Publication title -
journal of applied entomology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.795
H-Index - 60
eISSN - 1439-0418
pISSN - 0931-2048
DOI - 10.1111/j.1439-0418.1988.tb00620.x
Subject(s) - leptinotarsa , colorado potato beetle , biology , eulophidae , horticulture , botany , larva , melongena , solanum , parasitoid
Results are reported of an experiment conducted on two plots of Solanum melongena L. in 1986 and 1987 in two locations in Central Italy to evaluate acclimatization, as well as efficiency of the parasite Edovum puttleri Grissel on potato beetle eggs. Results showed that: E. puttleri was not able to overwinter because of low temperatures; the efficiency of this parasite, expressed as the ratio of the number of released females to the number of parasitized and collapsed potato‐beetle eggs, was very different in the two environments; best results were obtained by doing timed‐releases beginning with the first appearance of adult potato beetles that had overwintered. Summary Results are reported of a study carried out in two locations in Central Italy in 1986 and 1987, regarding the efficiency of E. puttleri on eggs of L. decemlineata in two fields of S. melongena. Highest egg mortality (parasitized plus collapsed) was obtained when releases were made at the beginning of the first generation, enabling E. puttleri to have 2 generations. In fact, in this case, each female E. puttleri was able to cause an average mortality of 5.86%, while releases made at the beginning of the second generation gave poorer results, 2.62%. Timed‐releases also gave better results. Furthermore, the parasite did not survive winter temperatures, indicating that potato beetle control should be carried out by annual releases of E. puttleri and probably with higher numbers. Zusammenfassung Freilanduntersuchungen an Edovum puttleri Grissel (Hym., Eulophidae), Eiparasit des Kartoffelkäfers, Leptinotarsa decemlineata Say. (Col., Chrysomelidae) in Mittelitalien Es werden die Ergebnisse eines Experiments mitgeteilt, das 1986 und 1987 auf 2 Versuchsflächen, bebaut mit Solanum melongena L., an 2 Orten in Mittelitalien durchgeführt wurde, um die Akklimatisierung und Wirksamkeit des eingeführten Eiparasiten Edovum puttleri in Eiern des Kartoffelkäfers, E. decemlineata , zu untersuchen. Es zeigte sich, daß E. puttleri auf Grund zu niedriger Temperaturen nicht imstande war, zu überwintern. Die Wirksamkeit dieses Parasiten, gemessen am Vergleich zwischen der Zahl freigelassener Weibchen und der Zahl parasitierter Kartoffelkäfer‐Eier, war an den zwei Orten sehr unterschiedlich. Die besten Ergebnisse wurden mit mehrfachen Freilassungen erzielt, wobei die erste mit dem Erscheinen der Kartoffelkäfer nach der Überwinterung zusammenfiel.