Results of last season’s alternaria (early blight) monitoring in British potato crops has further reinforced the pattern of earliest infection from A alternata, with A solani typically coming into crops later in the season, writes The Scottish Farmer’s Ken Fletcher in this news story.
The monitoring, sponsored by Syngenta and undertaken by independent and industry potato agronomists sampling, suspected cases throughout the season, with laboratory analysis by NIAB specialists to determine the species of alternaria present.
Until a sampling date of July 23, 85% of the positive alternaria infections identified were only alternata, with 15% solani and only at low levels. From July 24, however, 81% of samples contained solani and just 9% solely alternata. Around 20% of samples tested had mixed infection and no alternata was identified in the sampling after August 9.
“This season’s weather conditions have also seen a very high risk of late blight developing,” says Syngenta’s technical manager, Michael Tait. “It’s essential for growers and agronomists to maintain a high level of protection against infection.”
Source: The Scottish Farmer. Read the full story here
Photo: A classic case of alternaria blotches on potato leaf. The Scottish Farmer