The downy mildews

brassica breeding methods chemical control control cultural cultural control disease control disease resistance epidemia epidemics epidemie epidemiology esporas fongicide fungal diseases fungicidas fungicides geographical distribution grapevines haricot commun helianthus annuus hops hortalizas (plantas) hosts kidney beans legumes leguminosas lutte chimique lutte culturale mildews mildiou oidium mildiu onions ornamental plants pisum plantas ornamentales plante ornementale poaceae resistencia a la enfermedad soja soybeans spore spores tabac tabaco tobacco vegetable crops vicia vid vigne