Recovery of non-target plants affected by airborne bromoxynil-octanoate and metribuzin

Authors: Follak S.; Hurle K.

Source: Weed Research, Volume 44, Number 2, April 2004 , pp. 142-147(6)

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Abstract:

Summary The present study was conducted to evaluate the recovery potential of non-target plants affected by two airborne herbicides. Sunflower at the two-leaf stage was used as a test plant and exposed for 24 h in a wind tunnel to a range of concentrations of airborne bromoxynil-octanoate and metribuzin. Quantum yield (_PSII) of exposed leaves and of the second leaf pair developed after exposure was determined at a particular time up to 16 days following exposure. Maximum depression in quantum yield of exposed leaves from which a complete recovery occurred within 16 days was 63% for bromoxynil-octanoate and 60% for metribuzin respectively. The corresponding maximum concentrations were 1.310 and 0.390 g m^-3 respectively. The second leaf pair was also affected and showed a similar recovery potential. From the results it can be concluded that the significance of airborne bromoxynil-octanoate and metribuzin must not be overestimated, as sunflower and non-target plants with a similar sensitivity are likely to recover from air concentrations of both herbicides reported under field conditions.

Keywords: ecotoxicology; airborne herbicides; photosynthesis; recovery; ecological significance; non-target terrestrial plants

Document Type: Research article

DOI: http://dx.doi.org/10.1111/j.1365-3180.2004.00383.x

Publication date: 2004-04-01