Amistar Top can cure Alternaria in carrots

Carrot plots treated with Amistar Top did best against Alternaria leaf blight in fungicide trials run by Syngenta in conjunction with Agrovista at Goole, East Yorkshire.

"The purpose of the trials was actually to focus on options for control of Sclerotinia," said Syngenta Crop Protection field technical manager Jon Ogborn.

"Sclerotinia has been a severe problem this year because of the wet weather, particularly as you go further north. For instance, Scotland has been very badly hit. But the trials were drilled late and there wasn't much Sclerotinia, although we did see low levels of Alternaria."

Amistar Top, which contains difenoconazole and azoxystrobin, has curative and protective action. Ogborn said that plots sprayed with three approved competitor products - Signum, Nativo 75WG and Folicur - looked much the same but "were all beaten by Amistar Top".

Syngenta is also pursuing approval on carrots for its fungicide Switch. Its two active ingredients, cyprodinil and fludioxonil, are novel in their mode of action for carrot crops, giving growers a better chance of managing the risk of disease resistance.

"The concern for growers is that of the four main products currently used for Sclerotinia control, three are strobilurin-based and three contain triazoles," said Ogborn.

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