Symptoms include leaf mottling and narrowing, as well as fruit malformation and yellowing. The only methods of reducing the effect of this virus are to control the alternative weed hosts and reduce the numbers of the aphid vector. As with all viruses in plants, there is no cure once a plant is infected. Root knot nematode, Meloidogyne sp. Root knot nematode is a widespread organism that infects most cultivated crops that are included in the normal rotation.
Capsicums are less affected than most other vegetable crops.
Only grasses can be considered to be immune from its attack and sweetcorn may be included in the rotation if necessary. Control with preplant nematicides or soil sterilants may be indicated. For recommended materials and methods of application, see Farmnote No. Acknowledgements The illustrations of bacterial spot symptoms have been provided by the Queensland Department of Primary Industries.