Kielkiewicz, M., Witul, A., 1995.
Effectiveness of integrated control of spider mites on gerbera. Materialy Sesji Instytutu Ochrony Roslin, 35: 133-137.
Abstract
In studies in Poland, in the second year of gerbera (cv. Terracerise Playa, Veronica, Ingmar) cultivation, spider mites were the dominant pests, and could cause serious damage to the crop. Two species was found: Tetranychus urticae and T. cinnabarinus. Phytoseiulus persimilis was introduced at a rate of 8-30 specimens/m2. As a result of the activity of the predator and selective chemical treatments, the spider mite population declined significantly. On cv. Ingmar, which showed the greatest initial infestation, the pest population had decreased to 0.5 mite/leaf 6 weeks after the last predator introduction.. On cv. Terracerise, the spider mites were observed 11 weeks after the last introduction, but their population was low, not exceeding 4-6 specimens/leaf. Another predatory mite, Amblyseius californicus [Neoseiulus californicus], a new species for the Polish fauna which spontaneously appeared on the experimental plants, must have contributed significantly to the reduction of the spider mite population. During 18 weeks of observations, spider mites were not found on gerbera flowers cv. Veronica and Terracerise. However, they were once observed on the flowers of cv. Ingmar, being confined to one spot of the bed. At the same time, the number of mites feeding on leaves oscillated between 12 and 15/leaf. Integrated control was as effective as chemical control
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