The effect of different treatments on pear psyllid (Cacopsylla pyri) in organic pear growing.

In 2008 and 2009 we did experiments with different treatments on the second generation of pear psyllid in June. Treatments in 2009 were potassium bicarbonate with and without the surfactant Trifolio S-forte, Agricolle and the experimental insecticidal fungus PAI 08 005. All treatments were ineffective on infestation in the field, but pears treated with potassium bicarbonate plus additive Trifolio S-forte had less sooty mould after harvest.