Viruses Various viruses may attack these crops. Symptoms include distortion and yellow markings on the foliage, stunting and possibly flower abortion. There are no controls available and infected plants should be removed promptly. This is because viruses are generally very readily spread. Glasshouse whitefly Whitefly feed by sucking plant sap and are common on both peppers and aubergines.
Prompt control is essential, as whitefly breed rapidly in a greenhouse.
In warm weather, plants outside may also be attacked. Use a suitable insecticide or reliable biological control. This includes a tiny beetle called Delphastus for heavier infestations or regular introductions of a parasitic wasp, Encarsia formosa . Red spider mite These tiny mites feed mainly under the leaves at first, causing slight mottling of the leaf surface. Then, if the infestation builds up, it causes leaves to turn brown and die.