Fungicide Rudis approval extended to cauliflower, broccoli and calabrese

The fungicide Rudis with tzt technology has gained approval for use on cauliflower and broccoli/calabrese. Its label now covers all the main outdoor brassica crops.

Crops of autumn cauliflower usually require two fungicide sprays to keep them clean through the September to December period of disease pressure. The Allium & Brassica Centre’s Andy Richardson sees Rudis (prothioconazole) fitting well as the second spray after a strobilurin-based fungicide such as Nativo 75 WG (trifloxystrobin + tebuconazole) which is often used first for broad spectrum control and white blister protection.

From experience of using Rudis on other brassica crops he says; ’Being a new generation DMI it is clearly more effective than other products growers have been using later in the season, particularly against the main disease ring spot. It also fits well for strobilurin resistance management.’

Nathan Whitehouse, Bayer’s product manager for vegetable crops, says the triazolinthione (tzt) technology in Rudis advances disease control and plant health. ’It combines exceptional protection with curative activity and uniquely for a DMI delivers greening and physiological effects in the same league as strobilurins.’

As for Brussels sprouts and cabbage, maximum individual dose is 0.4 L/ha, three applications per crop are permitted and latest time of application is 21 days before harvest. Nathan adds that growers can use existing Rudis stock on these newly approved crops but must obtain the new approval from the CRD website before application.