The Efficacy of Reduced Doses of Herbicides CALLISTO 480 SC + ATPLUS 463 and BASAGRAN SUPER on Fallopia convolvulus

摘要

Black bindweed (Fallopia convolvulus) is an annual spring weed, which is common in all crops and production regions of the Czech Republic. Due to its high abundance and good adaptability this weed is classified as an important weed species not only inthe Czech Republic but also abroad. The use of chemicals (herbicides) is one of possibilities how to control it. However, herbicides belong to substances showing significant negative effects on the environment. Regarding efforts how to reduce this environmental load it seems to be suitable to use those methods, which enable to define an optimum dose of herbicide and their efficacy on concrete weed species in individual stages of their development. Such methods have been used for many years in the Dutchinstitute Plant Research International Wageningen. The so-called Minimum Lethal Herbicide Dose Method (MLHD) enables to calculate low doses of herbicides on the base of measuring of photosynthetic efficiency. The MLHD method enables to calculate the minimum doses of herbicides belonging to the group of photosynthesis inhibitors with regard to the required control of individual weed species in their developmental stages on a given plot (Haage et. al., 2002).