Potato Review

www.potatoreview.com POTATO REVIEW JULY/AUGUST 2022 37 SLUG CONTROL A S the key slug control timing in many potato crops approached growers have been urged to select a durable slug pellet that will lengthen control once canopies close. Although dry conditions have prevailed for much of spring, the preceding mild winter beforehand would have maintained slug populations, according to independent potato specialist Martyn Cox. Although dry on top, he said ridges have mostly remained moist at depth up to this point and there is potential for keeled slugs – the main threat to potato crops – to move up the profile once irrigation starts. “Just because there’s been little rain, don’t think the slug risk isn’t there. As with any pest, risk assessment is key when deciding on pellet ‘Slug control: Don’t be fooled by drier weather’ Continue control when canopies close as ridges are still dry at depth, specialist advises. treatment. We usually apply at mid row closure and top up regularly where necessary,” he said. Martyn said his growers have managed slugs well with ferric phosphate pellets since other active substance options have been withdrawn, but there are clear differences between product formulations that should be taken into consideration. Pellets that don’t spread well are a no-no and those same pellets tend to break down much faster after application, particularly in moist conditions typically found under irrigated potato canopies. “Pellets must hold together well to get the baiting points where they need to be, and offer any decent period of activity,” he said. The durability of Sluxx HP is well proven in irrigated trials, but new work in Germany “Just because there’s been little rain, don’t think the slug risk isn’t there. As with any pest, risk assessment is key.” Martyn Cox, Agronomist has added to the product’s credentials for use in spring crops like potatoes, according to Certis Technical Specialist Harry Raley. In a caged arena experiment carried out by European research organisation EcoCare in 2021, the reduction in feeding achieved with Sluxx HP and a competitor at 10C and 20C was tested. It showed that both wet processed pasta-based pellets performed well at 10C, but at 20C feeding was reduced by Sluxx HP by 85% after eight days, compared to just 3% with the alternative pellet. “With temperatures now warming up, Sluxx HP’s premium formulation will provide crops with a longer period of protection and growers with peace of mind the product is doing its job after canopies close,” said Harry. Certis’ Harry Raley says new trials work in Germany is showing effectively reducing feeding habits. Slug control pellets are best applied at mid row closure but should be topped up regularly where necessary.