Written by Charlotte Cunningham
Growers may be able to minimise the risks from BYDV and septoria through careful variety selection, according to the latest advice from Syngenta. Charlotte Cunningham reports. According to crop protection firm, Sygenta, choosing winter wheat varieties with wide drilling windows will become a key starting point to reduce heightened risks from barley yellow dwarf virus (BYDV) and Septoria tritici starting this autumn. “The loss of neonicotinoid seed treatment chemistry against BYDV-carrying aphids for this autumn, and the 2020 withdrawal of the fungicide chlorothalonil, long relied upon as a backstop to control Septoria tritici, are both added reasons to drill winter wheat later,” said Tracy Creasy of Syngenta. “However, in order to make this possible, it will be vital to choose varieties suited to later drilling.” While later drilling is an already well-established control method for reducing black-grass, with growers no longer able to use a neonicotinoid seed treatment in cereals there is an added reason to delay autumn drilling until after aphid numbers decline, she added. As well as this, there is a potential benefit from the Septoria front, said Tracy. “Delaying drilling also eases Septoria pressures, by allowing it less time to build up before spring. “Then again, not all varieties respond well…
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