Hyaloperonospora parasitica on brassicas, Peronospora destructor on alliums, Peronospora farinosa f. sp. betae on red beet, Peronospora farinosa f. sp. spinaciae on spinach and Peronospora viciae on peas and broad beans. These pathogens are characterised by sporulating on the under-surfaces of leaves with chlorotic and necrotic areas found 01 the upper surfaces.A wide range of field vegetable crops are attacked by the pathogens, including onion, garlic, leek, chives, shallots, beetroot, brassicas, peas, broad beans and spinach.
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