Prediction of herbicide activity

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Abstract
Summary: The performance of a herbicide is influenced by a number of factors, such as temperature, humidity, weed species and stage of development of the weed. Trials in glasshouses and climatic chambers have shown that the shape of the dose‐response curve of a herbicide is dependent only on the mode of action of the herbicide. Therefore, the performance of a herbicide under different climatic conditions can be described as a parallel displacement of the dose‐response curve. The same seems to be the case regarding the performance of a herbicide against different weed species or against one weed species at different growth stages. The trial programme is in an introductory phase, but the intention is, on the basis of trials where the influence of the above mentioned factors are quantified, to build up a simulation model that adjusts the dose to the conditions prevailing at the time of spraying. In this paper, the results from trials in climatic chambers to test the effect of a herbicide under different climatic conditions, and glasshouse trials with three weed species at three stages of development, are summarized.

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