Even vegetables grown on balconies and terraces can be subject to attack by animal or fungal parasites and diseases. Diseases can result from mistakes made in the cultivation of the plant such as wrong exposures, plantings too close together or incorrect watering. Even if the plant has been grown correctly, it can however happen that it is attacked by parasites of animal origin, such as insects, or by fungi: in the first group we can mention for example the aphids, also called plant lice, which gather in bushes colonies that suck sap from tender shoots and branches. Ants that feed on the honeydew produced by the aphids often appear together with aphids. To combat this infestation, manually remove the insects and wash the plant. The cochineal instead protects itself with a white waxy shield and hides under the lamina of the leaves: to fight it, rub ethyl alcohol on the affected part or spray white oil in emulsion. We remind you that in the summer or when it is hot we will have to use summer mineral oil. Other insects are the red spider, the cabbage butterfly which must be eliminated either manually, or, in the case of the red spider, with an infusion of horsetail. As for the diseases of fungal origin we remember the best known such as downy mildew and white sickness: the first, which can be treated with nettle infusion, manifests itself with yellow-brown spots on the upper page of the leaves, which are covered under of a whitish mold, and with rot along the stem. The second instead manifests itself with a whitish dusty patina on all parts of the plant. If it is not possible to prevent its spread, initially it will be better to eliminate the plant completely. Other diseases of fungal origin are rust and gray mold.