Structural changes in the guild of aphidophagous coccinellids in Bohemian hop gardens

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F14864347%3A_____%2F17%3AN0000078" target="_blank" >RIV/14864347:_____/17:N0000078 - isvavai.cz</a>

Result on the web

<a href="http://www.lfl.bayern.de/ipz/hopfen/024299/" target="_blank" >http://www.lfl.bayern.de/ipz/hopfen/024299/</a>

DOI - Digital Object Identifier

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Result language

angličtina

Original language name

Structural changes in the guild of aphidophagous coccinellids in Bohemian hop gardens

Original language description

VOSTŘEL, Josef. Structural changes in the guild of aphidophagous coccinellids in Bohemian hop gardens. In: F. WEIHRAUCH, ed. Proceedings of the Scientific-Technical Commission 25 – 29 June 2017, St. Stefan am Walde, Austria. Wolnzach: Scientific-Technical Commission of the International Hop Growers´ Convention, 2017, p. 110. ISSN 2512-3785. The spectrum of aphidophagous coccinelids recently has changed considerably in Bohemian hop gardens. It was caused by the invasion of Asian harlequin ladybird Harmonia axyridis (Pallas). Whereas, in the period before its invasion, the native species Coccinella septempunctata L., Adalia bipunctata L. and Propylea quatuordecimpunctata L. used to be the dominant predators of damson hop aphid Phorodon humuli (Schrank), H. axyridis is the most frequent ladybird species in the Žatec (Saaz) hop growing region nowadays. Six years ago, the harlequin ladybird represented just 10 % of the total Coccinellidae, but since 2015 it has become the most abundant ladybird species. This may have been caused by the aggressiveness of H. axyridis, whose larvae were observed to feed on eggs and young larvae of the native species. To prevent attacks from larvae of H. axyridis, females of C. septempunctata appeared on hop plants and began to lay eggs earlier, as illustrated by the presence of the fourth instar larvae in times when larvae of H. axyridis reached smaller size and were not competitive enough. This phenomenon was observed in our experimental garden in Stekník again in 2016. Whereas H. axyridis represented 77.4 % of all coccinellid adults, native species, especially C. septempunctata and A. bipuctata, were very scarce. Therefore, the arrival of this aggressive invasive species does undoubtedly have a negative effect on native guild of aphidophagous coccinellids because of its aggressiveness and so its presence is questionable.

Czech name

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Czech description

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Type

O - Miscellaneous

CEP classification

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OECD FORD branch

40106 - Agronomy, plant breeding and plant protection; (Agricultural biotechnology to be 4.4)

Project

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Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2017

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů