Alternate hosts

Alternate hosts harbouring pests and diseases should be removed where possible. A few examples of many alternate hosts are given here. Soil-borne problems, such as club root of cabbage and free-living eelworms on strawberries are harboured by shepherd's purse (Capsella bursa-pastoris) and chickweed (Stellaria media) respectively. Groundsel (Senecio vulgaris) is an alternate host of rust on cinerarias, while docks (Rumex spp.) act as a reservoir of dock sawfly, which damages young apple trees.

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