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Journal of Plant Diseases and Protection

, Volume 113, Issue 4, pp 181–187 | Cite as

Effect of temperature and host plant on the efficacy of different entomopathogenic fungi from Thailand against Frankliniella occidentalis (Pergande) and Thrips tabaci Lindeman (Thysanoptera: Thripidae) in the laboratory

  • M. Thungrabeab
  • P. Blaeser
  • C. SengoncaEmail author
Article

Abstract

The current study is focusing on the effect of temperature and host plant on the efficacy of different entomopathogenic fungi from Thailand against western flower thrips, Frankliniella occidentalis (Pergande) and onion thrips, Thrips tabaci Linde-man (Thysanoptera: Thripidae). The results showed that the efficacy of five entomopathogenic fungi, i.e. two isolates of Beauveria bassiana (Balsamo) Vuillemin (Bb. 4591 and Bb. 5335), two isolates of Metarhizium anisopliae var. anisopliae (Metsch) Sorokin (Ma. 6079 and Ma. 7965) as well as one isolate of Paecilomyces fumosoroseus (Wize) Brown & Smith (Pfu. 5338) varied depending on the temperature and the fungal isolate in both thrips species. The Lc50 values decreased with increasing temperature. All fungal isolates showed a significantly higher efficacy against both thrips species at 25 and 30°C than at 16°C. Among five isolates, B. bassiana Bb. 5335 and M. anisopliae Ma. 7965 were superior in terms of efficacy against both thrips species within a broader range of temperature. The effect of host plants on the efficacy of B. bassiana (Bb. 5335) and M. anisopliae (Ma. 7965) was tested against first instar larvae of F. occidentalis and T. tabaci. The results revealed that the efficacy of these two fungi against F. occidentalis and T. tabaci varied with to the host plant, whether on crop or on ornamental plants. Both thrips species reared on bean, cucumber, leek and swan river daisy were highly susceptible to fungal infection but significantly less susceptible when reared on cotton and saintpaulia.

Keywords

Beauveria entomopathogenic fungi Frankliniella occidentalis host plant effect Metarhizium onion thrips temperature Thrips tabaci western flower thrips 

Einfluss der Temperatur und Wirtspflanzen auf die Wirksamkeit von verschiedenen entomopathogenen Pilzisolaten aus Thailand als erfolgversprechende Bekämpfungsagenzien gegen Frankliniella occidentalis (Pergande) und Thrips tabaci Lindeman (Thysanoptera: Thripidae) im Labor

Zusammenfassung

Das Ziel der vorliegenden Untersuchung war es, den Einfluss von Temperatur und Wirtspflanzen auf die Wirksamkeit unterschiedlicher entomopathogener Pilze aus Thailand gegenüber dem Kalifornischen Blütenthrips, Frankliniella occidentalis (Pergande), und dem Zwiebelthrips, Thrips tabaci Lindeman (Thysanoptera: Thripidae), zu ermitteln. Die Ergebnisse zeigen, dass die Wirksamkeit der fünf entomopa-thogenen Pilzisolate von Beauveria bassiana (Balsamo) Vuillemin (Bb. 4591 und Bb. 5335), Metarhizium anisopliae var. anisopliae (Metsch) Sorokin (Ma. 6079 und Ma. 7965) und Paecilomyces fumosoroseus (Wize) Brown & Smith (Pfu. 5338) gegenüber beiden Thripsarten in Abhängigkeit von der Temperatur und dem Pilzisolat variierte. Die Lc50-Werte verringerten sich mit zunehmender Temperatur, wobei alle Pilzisolate eine signifikant höhere Wirksamkeit bei 25 und 30°C als bei 16°C gegenüber den beiden Thripsarten zeigten. Die höchste Wirkung gegenüber beiden Thripsarten konnte bei B. bassiana Bb. 5335 und M. anisopliae Ma. 7965 in allen Temperaturbereichen ermittelt werden.

In weiteren Untersuchungen wurde der Einfluss der Wirts-pflanzen auf die Wirksamkeit von B. bassiana (Bb. 5335) und M. anisopliae (Ma. 7965) gegenüber dem ersten Larvenstadium von F. occidentalis und T. tabaci untersucht. Die Wirksamkeit der beiden Pilzisolate variierte bei F. occidentalis und T. tabaci in Abhängigkeit von der Wirtspflanze sowohl bei Kultur- als auch bei Zierpflanzen. Beide Thripsarten, die auf Buschbohnen, Gurken, Porree und Blauem Gänseblümchen gezüchtet wurden, zeigten eine hohe Anfälligkeit gegenüber den beiden Isolaten, waren aber signifikant geringer empfindlich als diejenigen, die sich an Baumwolle und Usambaraveilchen entwickelten.

Stichwörter

Beauveria entomopathogene Pilze Frankliniella occidentalis Kalifornischer Blütenthrips Metarhizium Temperatur Thrips tabaci Wirtspflanzeneinfluss Zwiebelthrips 

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Copyright information

© Deutsche Phythomedizinische Gesellschaft 2006

Authors and Affiliations

  1. 1.Department of Entomology and Plant Protection, Inres-PhytomedicineUniversity of BonnBonnGermany

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