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- W2406440897 abstract "If a grower uses predatory mites, and should use chemical compounds, he needs to be very careful in his choice of products. The selected products have to be efficient against the target pest and at the same time compatible with the present beneficial's. Useful tools for such product selection under greenhouse circumstances are side effects lists. These lists are freely available on the websites of producing companies of biological control agents. But not all products (e.g. newly developed ones) have been tested for side effects. Moreover the information already available in these tables is not based on field tests. For this reason, we have developed a protocol for quick screening of side effects of chemical plant protection products under field conditions. For these experiments we have chosen the predatory mite Amblyseius swirskii as test organism, because this is an often used phytoseiid mite, which is very sensitive to pesticides. Hibiscus rosa sinensis is the standard reference plant in our side effects trials because the chosen predatory mite has shown very good control of pests on this plant species. The experimental design consists of eight test objects in 4 replications. Test object 1 is a positive reference (water spray) and test object 2 a negative reference (deltamethrin spray, a product with long residual activity against beneficial organisms). The plot size is 0,68 m2 and each plot contains 32 Hibiscus plants. The greenhouse temperature is set at 20±2°C. The test strategy has the following sequence: introduction of an overdose of Amblyseius swirskii mites 14 days before spraying the pesticides > precount of predatory mites 4 days before application (4DBA) > spray application (A) for the 6 test products and for the 2 references > counting's after application (1, 2, 4, 8 en 12 weeks after application = 1 till 12WAA). The counting's of the number of predatory mites are performed on 20 Hibiscus leaves/plot under a binocular. Because of the absence of any food sources for the A. swirskii mites, it's necessary to re-introduce a high dose of predatory mites in the Hibiscus crop every 4 weeks, especially 2 weeks before the counting's 4, 8 and 12WAA; these introductions are carried out by hanging out 7 sachets with predatory mites (250 mites/sachet or 2500 mites/m2) on each test plot and after 10 days they are removed. In our first experiments the following commercial products have been tested: Pyrethro Pur (rapeseed oil + pyrethrins), Actara (thiamethoxam), Rizolex 500 SC (tolclofos-methyl), Topsin 500 SC (thiophanate-methyl), Floramite 240 SC (bifenazate), Cycocel 75 (chlorrmequat chloride), Vertimec (abamectin), Match (lufenuron), Nocturn (pyridalyl), Neemazal-T/S (azadirachtin), Tracer (spinosad), Envidor (spirodiclofen), Carex 10SC (pyridaben), Nissorun (hexythiazox) and Scelta (cyflumetofen). As expected the water treatment was safest for A. swirskii and deltamethrin killed most of the mites, even if they were re-introduced after 8 or 12 weeks. Also pyrethrins and spinosad showed very negative effects. Abamectin and bifenazate showed intermediate negative effects and should be used with caution. The other products were safe to use in combination with predatory mites. These screening tests will be repeated yearly with new and popular products of which the side effects in practice are currently uncertain." @default.
- W2406440897 created "2016-06-24" @default.
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- W2406440897 date "2014-01-01" @default.
- W2406440897 modified "2023-09-23" @default.
- W2406440897 title "TESTING SIDE-EFFECTS OF COMMON PESTICIDES ON A. SWIRSKII UNDER GREENHOUSE CIRCUMSTANCES." @default.
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