Potato Review

www.potatoreview.com POTATO REVIEW NOVEMBER 2021 15 FUNGICIDES left exposed. Ametoctradin sits in a FRAC group of its own and so the MOA does not clash with any other group of actives, such as the QiIs or CAAs. This makes it very useful when building a programme that doesn’t exceed recommendations on use, especially when we get a challenging season where late blight turns against us.” Lower rate and mix Last year BASF tested 1.2l/ha Enervin SC with a 2.5l/ha rate of cymoxanil + propamocarb. For cost reasons, the rate of the cymoxanil + propamocarb was cut to 1.5l this year. “Many would opt for the lower rate so that’s what we did and the mix with Enervin SC did a very good job,” said Paul. “While the tank-mix with cymoxanil + zoxamide was the weakest of the treatments, it is a combination that doesn’t clash with any CAAs or QIIs in a programme. In a field situation, where the ‘infection triangle’ of host, inoculum and conditions, isn’t so heavily loaded against you, it would prove another useful option.” The final tank-mix plot saw both products applied at 80% of full rate to deliver, 200g ametoctradin and 125g mandipropamid. “Both partners are what I’d call ‘top drawer’ and this trial was about being sensible with regard to cost. Do you need both at full rates? Well, if you want a blight free plot with the pressure that was at the site this year, yes, we do. However, with a lower, more realistic pressure in a field situation, you probably wouldn’t.” Alongside the plots treated with Enervin SC, were those treated with Percos and BASF’s latest late blight product, BAS 657 which will be available next season pending approval from the regulators. Paul said: “BAS 657 is a combination of Enervin SC’s active ingredient, ametoctradin, formulated with potassium phosphonate to deliver genuine synergy. With multisite and truly systemic activity, it gives great overall protection and fits very well early in the programme, freeing up slots for other actives later where they may be better targeted or when saving the strongest for when blight really gets cooking.” Inoculated Markies For the first time BASF also had plots of Markies which were inoculated with alternaria solani. “We’ve an exciting product coded as BAS 750 containing our new blockbuster AI, Revysol, coming to the potato crop, with approval anticipated before the year end. Revysol is the first isopropanol-azole, a unique chemistry discovered and developed by BASF combining an outstanding performance with a favourable regulatory profile and selectivity. “In trials this has consistently demonstrated it delivers a new level of efficacy; similar to the step up we saw in late blight control when oxathiapiprolin came along. Control of alternaria is stronger and more reliable than the current go-to triazole standard.” “We’ve an exciting product coded as BAS 750 containing our new blockbuster AI, Revysol, coming to the potato crop, with approval anticipated before the year end.” Enervin SC and Percos were put through their paces at Eurofins.