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The effect of spraying with a mixture of herbicides containing phenmedipham, desmedipham, and ethofumesate on photosynthetic intensity in leaves of nine strawberry cultivars

Jerzy Lisek*, Stanisław W. Gawroński**

**Research Institute of Pomology and Floriculture
**Pomologiczna 18, 96-100 Skierniewice, Poland
**Department of Pomology and Basic Natural Sciences in Horticulture
**Warsaw Agricultural University
**Nowoursynowska 166, 02-766 Warsaw, Poland

Foliar application of a mixture of herbicides containing phenmedipham, desmedipham and ethofumesate to the plants of nine strawberry cultivars revealed variations in plant tolerance to the applied herbicides. In 1994 and 1996, the relationship between herbicide application and net photosynthetic intensity was determined by means of an infrared gas analyser. Reduction in photosynthetic intensity in strawberry leaves following spraying with the above-mentioned mixture was greater in cultivars with a lower tolerance (‘Dana’, ‘Gerida’) to the applied herbicides than in cultivars having a very high tolerance (‘Senga Sengana’, ‘Dukat’, ‘Kama’, ‘Real’). Measurements of photosynthetic intensity can be used as a supplementary method of assessing the suitability of phenmedipham, desmedipham and ethofumesate mixtures for weed control in new strawberry cultivars.

Lisek J., Gawroński S.W. 2001. The effect of spraying with a mixture of herbicides containing phenmedipham, desmedipham, and ethofumesate on photosynthetic intensity in leaves of nine strawberry cultivars. Folia Horticulturae 13/2: 137-147.