Biological interactions within tobacco biocenosis

Krsteska, Vesna (2014) Biological interactions within tobacco biocenosis. Acta entomologica serbica. ISSN 2406-158133-43 19(1/2):33-43

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Predatory hoverflies are useful pollinators in their adult stage and present a natural enemy of plant pests, especially of aphids in their larval stage.
The observation were made with application of the following methods of catching: check on all leaves of 20 tobacco stalks and check of 100 tobacco leaves, during the entire tobacco vegetation, in a period of 10 days. The collected material was further nourished and analysed under laboratory conditions. Tobacco crop was attacked only by Myzus persicae Sulzer and larvae were reared on tobacco leaves infested with M. persicae in Petri dishes.
During the period of three years Sphaerophoria scripta Linnaeus, Sphaerophoria rueppelli Wiedemann and Scaeva pyrastri Linnaeus are represented in great number.
The larvae from the species S. scripta in laboratory conditions consumed from 300 up to 365 aphids from the species M. persicae. The larvae from the species S. rueppelli 280-321 aphids and those of the species S. pyrastri 280-563 aphids. From these data we can see that they have great capacity of eating aphids. With their great voracity, and preserving their own kind, they control the population of aphids on tobacco, so they have great impact in the tobacco biocenoses.
The aphidophagous Syrphidae are the main predators among the others and they are ranged on the third trophic level of food chain: tobacco- leaf aphids- aphidophagous hoverflies.
In the complex food chain the aphidophagous Syrphidae are being parasitized by many species of parasites and because of that their ecological and economic usage is smaller.
During the laboratory analyzes 2003-2005 we have detected ten parasitic species of order Hymenoptera, ecloded in the pupae of the aphidophagous Syrphidae: Pachyneuron grande Thomson, Pachyneuron cf. grande Thomson, Syrphophagus aeruginosus Dalman, Diplazon laetatorius Fabricius, Diplazon sp. 2, Diplazon sp. 3, Homotropus sp. 1, Homotropus sp. 2, Sussaba sp. 1, Promethes sp. 1.
The parasitism has negative impact on lowering the number of the future generation of the species Syrphidae.
The species S. scripta, S. rueppelli and S. pyrastri can be used as an integral protection of the tobacco leaf aphids, because of their great quantitative representation and their great voracity.

Item Type: Article
Uncontrolled Keywords: tobacco, leaf aphids, aphidophagous hoverflies, parasites of Syrphidae.
Subjects: Scientific Fields (Frascati) > Agricultural Sciences > Agriculture, forestry and fisheries
Divisions: Scientific Tobacco Institute
Depositing User: Ms Biljana Jordanoska
Date Deposited: 08 Oct 2016 22:34
Last Modified: 08 Oct 2016 22:34

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