[Lettuce: efficacy of some fungicides on downy mildew and crown rot [Lactuca sativa L.; Latium]]

application rates bremia lactucae control de enfermedades controllo delle malattie crop yield date de traitement disease control dose d'application dosi di applicazione epoca di trattamento fecha de tratamiento field experimentation fongicide formulaciones formulation formulations formulazioni fungicidas fungicides fungicidi infection infezione lacio lactuca sativa latium lazio pesticide resistance rendement des cultures rendimiento de cultivos resistencia a los plaguicidas sclerotinia minor sclerotinia sclerotiorum sintomi sperimentazione in campo symptome symptoms treatment date