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Life table of Delphastus catalinae (Horn) (Coleoptera: Coccinellidae) on cotton whitefly, Bemisia tabaci (Genn.) (Homoptera: Aleyrodidae) as prey

Biologische Eigenschaften von Delphastus catalinae (Horn) (Coleoptera: Coccinellidae) als Prädator der Weißen Fliege Bemisia tabaci (Genn.) (Homoptera: Aleyrodidae)

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Abstract

Developmental time, longevity and fecundity of Delphastus catalinae (Horn), a predator of Bemisia tabaci (Genn.), were evaluated under laboratory conditions. Developmental time from egg to adult was 22.3, 15.57 and 18.41 days at 25, 30†C and at fluctuating temperatures of 25/35†C (12/12 h), respectively. It was also found that temperatures above 35†C were lethal, since all eggs were killed. The female adult’s longevity and reproduction differed with temperatures. Mean adult longevities were 105.25, 40.2 and 42.1 days, and total fecundities were 213.72, 118.94, and 117.93 eggs/Q at 25, 30†C and at fluctuating temperatures of 25/35†C, respectively. Additionally, life tables were constructed from data obtained to compare the effects of different temperatures. The highest reproductive rate was 88.93 at 25†C. In contrast, at 30†C the highest intrinsic rate of increase and the shortest generation time were 0.127 and 28.14 days, respectively. The results indicate that the optimum temperature for mass rearing of D. catalinae ranges from 25†C to 30†C.

Zusammenfassung

Ziel der vorliegenden Untersuchung war die Ermittlung der Entwicklungsdauer, Lebensdauer und Reproduktionsrate von Delphastus catalinae (Horn) (Coleoptera: Coccinellidae), ein Räuber der Weißen Fliege Bemisia tabaci (Genn.) (Homoptera: Aleyrodidae), im Labor. Die Entwicklungsdauer vom Ei bis zum Adulten betrug durchschnittlich 22,3, 15,57 und 18,41 Tage bei konstanten Temperaturen von 25†C bzw. 30†C und Wechseltemperaturen von 25/35†C (12/12 h). Temperaturen von über 35†C wirkten tödlich. Die Lebensdauer der Adulten betrug im Durchschnitt 105,25, 40,2 und 42,1 Tage bei konstanten Temperaturen von 25†C und 30†C sowie Wechseltemperaturen von 25/35†C. Die durchschnittliche Gesamtreproduktion betrug 213,72, 118,94 und 117,93 Eier/ bei 25†C, 30†C und 25/35†C. Darüber hinaus wurden sogenannte „Lebenstafeln” zum Vergleich der Auswirkungen der verschiedenen Temperaturen aus den Daten erstellt. Lebensdauer und Reproduktionsrate der adulten Weibchen variierten in Abhängigkeit von der Temperatur. Die höchste Reproduktionsrate betrug 88,93 bei 25†C. Bei 30†C betrugen die höchste spezifische Zuwachsrate 0,127 Tage und die kürzeste Generationsdauer 28,14 Tage. Die Ergebnisse deuten darauf hin, dass das Temperaturoptimum für die Massenzucht von D. catalinae zwischen 25†C und 30†C liegt.

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Kutuk, H., Yigit, A. Life table of Delphastus catalinae (Horn) (Coleoptera: Coccinellidae) on cotton whitefly, Bemisia tabaci (Genn.) (Homoptera: Aleyrodidae) as prey. J Plant Dis Prot 114, 20–25 (2007). https://doi.org/10.1007/BF03356199

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