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Effective concentration and range of activity of abamectin as seed treatment against root-knot nematodes in tomato under glasshouse conditions

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For more content, see Nematologica.

The objectives of this study were to determine the efficacy, range of activity and effective concentrations (EC50 and EC80) of abamectin as a seed treatment of tomato against Meloidogyne incognita, M. arenaria and M. javanica. The study revealed that abamectin seed treatment at concentrations ranging between 0.3 and 1 mg a.s. seed−1 is highly effective against the three species of root-knot nematodes, retaining its efficacy in the soil for 8 weeks. The highest EC50 found was reached at 0.2 mg a.s. seed−1. The highest EC80 for the number of egg masses per g root in the three Meloidogyne species was attained at 0.51 mg a.s. seed−1. Abamectin as a seed treatment is promising for the control of root-knot nematodes in the field since only low amounts of active ingredient are required to give adequate protection in the most sensitive stages of tomato root growth and development.

Affiliations: 1: Phytopathology and Nematology in Soil Ecosystems, Institute of Crop Science and Resource Conservation INRES, Department of Plant Health, University of Bonn, Nussallee 9, 53115 Bonn, Germany; 2: Syngenta Crop Protection, 4332 Stein, Switzerland


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