Written by Charlotte Cunningham
A flexible drift retardant, specifically designed for use with blight fungicides, could play an important role in keeping potatoes disease free this spring, according to adjuvant and biostimulant experts, Interagro. Charlotte Cunningham reports. Keeping late blight out of potatoes is a season long campaign for growers and one that seems to be getting tougher as the years go by. With resistance to fluazinam and a regular shift in blight populations, a robust resistance management strategy which improves coverage is essential to safeguard crops and chemistry, believes Stuart Sutherland, technical manager at Interagro. “Keeping spray intervals tight is a practice that growers have become familiar with, but it isn’t without its challenges when unfavourable conditions mean spray days are few and far between. “Drift is the biggest cause of off-target chemical movement and increases the threat to the crop from late blight where it’s not adequately protected.” What’s more, strong and weak fungicide actives can have weak spots due to poor coverage, and such weak spots in haulm protection are more likely to be found out, he adds. But while full crop coverage is vital to prevent scattered infection, the “umbrella-like” structure of the plant canopy – a series of interlocking…
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