The predatory mite <Emphasis Type="Italic">Typhlodromus pyri</Emphasis> (Acari: Phytoseiidae) as a biocontrol agent of <Emphasis Type="Italic">Eriophyes pyri</Emphasis> (Acari: Eriophyidae) on pear |
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Authors: | Ján Praslička Janka Schlarmannová Barbora Matejovičová Ján Tancík |
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Institution: | 1.Department of Zoology and Anthropology, Faculty of Natural Sciences,Constatntine the Philosopher University,Nitra,Slovakia;2.Department of Plant Protection,Slovak Agricultural University,Nitra,Slovakia |
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Abstract: | The effectiveness of the predatory mite Typhlodromus pyri and of an application of Polysulphide-Ca was compared during 2006–2008. The experiment showed differences in infestation
levels of pear leaves caused by Eriophyes pyri. The highest percentage of leaves with symptoms was found in untreated control group (⊘ 20.9%); the lowest percentage was
found in plots treated with T. pyri (⊘ 3.7%); and a slightly higher percentage was found in plots treated with Polysulphide-Ca (⊘ 8.6%). During 2006–2008 the
percentage of leaves with symptoms was approximately the same only in the untreated control plots (from 20.3% to 21.5%). The
percentage of leaves with characteristic symptoms in plots treated with T. pyri decreased from 5.5% in 2006 to 4.3% in 2007, and to 1.3% in 2008. On the other hand, the percentage of leaves with symptoms
in plots treated with Polysulphide-Ca increased from 5.5% in 2006 to 8.5% in 2007, and to 11.8% in 2008. The intensity of
symptoms on infested leaves was also different depending on treatments and years. The average biological activity was 82.4%
in plots receiving releases of T. pyri and 58.8% in plots treated with Polysulphide-Ca. |
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