A geostatistical approach to evaluate the side effects of insecticides on non target species using a non replicated treatments. Field research was carried out, in pear orchards in the Emilia-Romagna region (I), to study the side effects on populations of Anthocoris nemoralis F. of three different strategies to control the first generation of Cydia pomonella L. The strategies were: i) soft = application of CpGV, ii) OP = application of phosmet and chlorpyrifos and iii) reduced risk = thiacloprid and methoxyfenozide. These strategies were applied on large single block plots and the responses on Cacopsylla pyri L. and A. nemoralis F. populations were analysed by means of geostatistical approach. The A. nemoralis data was collected by means of a grid sampling plan based on referenced points while C. pyri were sampled as average of mobile instars per each plot. The population density of C. pyri and A. nemoralis were higher in OP and soft strategies than in the reduced risk strategy, but the prey/predator population ratio was similar for the three strategies. The geostatistical monitoring method could be adapted to measure the effects of different products on some target and non target species populations, also on non replicated large plots or wide areas.
A geostatistical approach to evaluate the side effects on non target species using a non repeated plot
CIVOLANI, Stefano;
2010
Abstract
A geostatistical approach to evaluate the side effects of insecticides on non target species using a non replicated treatments. Field research was carried out, in pear orchards in the Emilia-Romagna region (I), to study the side effects on populations of Anthocoris nemoralis F. of three different strategies to control the first generation of Cydia pomonella L. The strategies were: i) soft = application of CpGV, ii) OP = application of phosmet and chlorpyrifos and iii) reduced risk = thiacloprid and methoxyfenozide. These strategies were applied on large single block plots and the responses on Cacopsylla pyri L. and A. nemoralis F. populations were analysed by means of geostatistical approach. The A. nemoralis data was collected by means of a grid sampling plan based on referenced points while C. pyri were sampled as average of mobile instars per each plot. The population density of C. pyri and A. nemoralis were higher in OP and soft strategies than in the reduced risk strategy, but the prey/predator population ratio was similar for the three strategies. The geostatistical monitoring method could be adapted to measure the effects of different products on some target and non target species populations, also on non replicated large plots or wide areas.I documenti in SFERA sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
