Cultivars resistant or tolerant to pests, physiological disorders, fungal diseases, viruses, phytoplasmas are preferred.

High tolerance to aphids, viruses, bacteria, fungi.

Powdery mildew: Tolerant and resistant varieties. Take into account the development of new resistant mildew strains.

Soil borne diseases (e.g. Fusarium spp.): Grafting on resistant rootstock (cucumber).

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