Biological control of tomato pests in the Netherlands | [Lutte biologique contre les ravageurs de la tomate aux Pays Bas]
1999
Klapwijk, J.N. ((Koppert Biological Systems, Berkel en Rodenrijs (Netherlands)))
In 1996 a group of Dutch growers initiated an experiment growing insecticide-free tomatoes. After three years of experience we have drawn up the balance sheet. Most pests can be sufficiently controlled by natural enemies. The trend towards lower temperatures in the greenhouse, however, will make the biological control of whitefly more difficult. Research resulted in an Encarsia formosa strain better adapted to lower temperatures. Spider mite is the biggest problem and is not sufficiently controlled by Phytoseiulus persimilis, so chemical intervention is sometimes necessary. This, together with the lack of interest of the market to pay higher prices for an insecticide-free product resulted in a setback of the experimental project. In 1998 not a single grower reached the end of the crop cycle without using a certain amount of insecticides
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