Control of the apple sawfly Hoplocampa testudinea Klug in organic fruit growing

Summary

The best application technique and application data for the treatments with Quassia extract against
the apple sawfly Hoplocampa testudinea Klug were tested. The spraying solution was distributed
best on the receptacle of the blossom – the place where the sawfly larvae feed before the enter the
blossom – when the treatment was effecttuated at fading blossom with a high amount of water
(about 500 l/ha/mTh). The addition of T/S forte, a wetting agent, could also improve the efficacy of
Quassia treatments in a lower dose. Thus, it is recommended to apply in fading blossom with addition
of T/S forte and high amounts of water to obtain the best effect. If the conditions for applications
are good and the infestation is not too high, the normally recommended dose of 6 g/ha/mTh
can even be reduced.