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Annual crops:

Alternation and mixtures of cultivars are recommended, where appropriate.

Seed and Planting material should be of the highest possible level of health status (virus/disease free).

Perennial crops:

All propagation material should be inspected by the grower to be free of pests and diseases. Infested material must not be used.

It is strongly recommended that plant health quality control systems are implemented for private or inhouse (on farm) nursery propagation.