Potato cyst nematode controlling factors and their use in agriculture

A hatch-inactive stimulating agent obtainable from plants of the Solanaceae family has been found to be capable of stimulating hatching factor-induced hatch of potato cyst nematode. This stimulating agent can be used together with one or more hatching factor(s) in a hatching factor preparation, which is free of any hatching inhibitors, for the control of potato cyst nematode. The preparation is capable of achieving a maximum kill of 70-80 % of a viable potato cyst nematode egg population when the preparation is applied to a locus at a concentration of 10-20 g per hectare.