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Herbicide drift into hedgerows: Extent, effects and mitigation

Activity: Talk or presentation typesLecture and oral contribution

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Marianne Bruus - Lecturer

  • Department of Terrestrial Ecology
The approach of the presented studies was to quantify herbicide drift into hedgerows under realistic spraying conditions, compare spray drift values with the sensitivity of hedgerow species to selected herbicides and estimate the effect of various mitigation methods on both hedgerow bottom vegetation and fruit yield of hedgerow trees. A drift model was established to calculate the vertical distribution of spray drift in hedgerows under varying spraying conditions. The results show that both hedgerow bottom vegetation and common hedgerow trees are sensitive to drift relevant herbicide dosages. When combining measurements and model calculations it turns out that unsprayed buffer zones will mainly reduce deposition and hence herbicide effects in the lower part of the hedgerow. In contrast, chosing drift reducing nozzles or nozzle pressure  will reduce spray deposition at all heights of the hedgerow, as will spraying at times when wind speed is low and air humidity high, i.e. early in the morning. The beneficial effect on the fruit yield of hedgerow trees depends on species in sensitivity and the in vertical distribution of fruits.
27 May 2008

Event (Conference)

TitleSETAC 18th Annual Meeting

ID: 15039915