Effect of nitrogen fertilization - green pruning and fungicide treatments on Botrytis bunch rot of grapes [Vitis vinifera L. - Tunisia]

abonos nitrogenados application date botrytis cinerea chemical control concimi azotati control de enfermedades controllo delle malattie date d'application defruiting disease control epoca di trattamento fioritura floraison flowering fongicide fungicidas fungicides fungicidi grapevines lutte chimique marciumi nitrogen fertilizers poda podredumbres potatura pourriture pruning rots suppression de fruits taille tunisia tunisie vid vigne vitis vinifera