Possibilities to influence maturation feeding of the large pine weevil, Hylobius abietis L., with plant extracts and neem preparations
2001
Sibul, I. | Luik, A. | Voolma, K. (Estonian Agricultural Univ., Tartu (Estonia). Inst. of Plant Protection)
The effect of water extracts of 20 plant species and neem preparations NeemAzal-T and NeemAzal-T/S (Trifolio-M GmbH, Germany) on the maturation feeding of Hylobius abietis L. was studied in laboratory and field experiments. In laboratory tests, water extracts of Allium sativum, Taxus baccata, Heracleum sosnowskyi, Primula veris, Urtica dioica, Achillea millefolium, Colchicum autumnale, Phaseolus vulgaris and Tussilago farfara decreased the feeding activity of the large pine weevil significantly. In field conditions, only extracts of Taxus baccata and Primula veris displayed a short-term repellent effect. The repellent influence of neem preparations lasted during the whole vegetation period, at higher concentrations (20 per cent) the preparations had some phytoxic effect on conifer seedlings
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