CATT: a new and non-chemical pest and nematode control method in strawberry planting stock

G. van Kruistum, A. Evenhuis, J. Hoek, P. Kastelein, J.M. van der Wolf, J.A. Verschoor
As an alternative to MeBr fumigation, a 48 h controlled atmosphere temperature treatment (CATT) was developed and scaled up by Wageningen UR in cooperation with the Dutch plant propagating association Plantum. This results in an excellent de-infestation and 99.8% mortality of the strawberry tarsonemid mite (Phytonemus pallidus). This non-chemical and sustainable method provides a healthy production of high quality strawberry runners in the field. From 2009, CATT was scaled up to a commercial level and widely applied by Dutch nurseries. In 2011, this CATT method was successfully modified to also eradicate the root knot nematode Meloidogyne hapla (GROTERDAN99.7% mortality), which was not effectively controlled by MeBr fumigation. For an effective killing of the root knot nematodes, temperature must be raised to 40°C. In several experiments, the optimum conditions for high mortality of both tarsonemids and nematodes were studied. An adapted version of CATT was developed of 20 h at a temperature of 35°C and 50% CO2 followed by 20 h at a temperature of 40°C. In 2012, this adapted CATT was successfully upgraded and tested under field conditions. Additional research in 2013 led to the conclusion that cross infection of plants by the bacterial Q-disease (Xanthomonas fragariae) during CATT treatment is unlikely.
van Kruistum, G., Evenhuis, A., Hoek, J., Kastelein, P., van der Wolf, J.M. and Verschoor, J.A. 2015. CATT: a new and non-chemical pest and nematode control method in strawberry planting stock. Acta Hort. (ISHS) 1105:189-196
Fragaria × ananassa, nurseries, frigo plants, disinfection, Phytonemus pallidus, Meloidogyne hapla, Xanthomonas fragariae

Acta Horticulturae