Fourth International Bemisia Workshop International Whitefly Genomics Workshop
Implementation of Chemical and Biological Protection Compounds of Different Chemical and/or Biological Groups against Whiteflies in IPM Systems
1 Biobest N.V. Belgium. Correspondence: guido.sterk@skynet.be
2 Ghent University, Faculty Agricultural & Applied Biological Sciences Belgium
Several new chemical insecticides against whiteflies have recently reached the market in Europe. The most important ones are flonicamid, pymethrozine, spiromesifen and some neonicotinoids. To determine if they fit with biological control agents and pollinators in IPM systems in protected crops, their side-effects were determined in semi-field trials against several beneficial organisms. The so called physical compounds are another specific group of pesticides. They only kill through their sticking or suffocating mode of action, no active ingredients or no direct effects on the pest are involved. Some of them are very effective against larvae and adults of different species of whiteflies, spider mites, pear sucker and even powdery mildew. They also seem to be rather harmless for most predators, parasitoids and pollinators. However, the main risk here is their possible fytotoxicity for certain varieties of greenhouse crops, fruit trees or ornamentals. Entomopathogenic fungi are used in glasshouses and protected crops in Europe against Trialeurodes vaporariorum and Bemisia tabaci. Some trials were made in Spain against Bemisia tabaci with PreFeRal, based on the fungus Paecilomyces fumosoroseus in comparison with Beauvaria bassiana with encouraging results. While testing the side-effects of fungicides against Paecilomyces fumosoroseus it became clear that some of them were highly effective themselves against whiteflies. This was investigated in detail at the Ghent University, and mancozeb e.g. turned out to show a very good efficacy against eggs and larvae of Trialeurodes vaporariorum.
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