establish that they are responsible for the germination of the seeds of Striga hermothica, it would now be necessary to associate a more thorough phytochemical study with an activity study and establish the chemical formula of these substances. Conclusion and application of results: Further studies of the biological activity of Polygala rarifolia may be carried out with the objective of confirming or adding other unidentified results here. All these interesting results can be put into practice in the field through pre-extension to farmers taking into account the often unfavorable climatic conditions.
Objective: The dispersal and maintenance of annual weeds depend on the production and dissemination of their seeds. Rhamphicarpa fistulosa does not escape this rule. Chemical control is, among others, recommended. The objective is to optimize the treatments by determining the best periods and the best conditions for application of herbicides. Methodology and results:The experiment was carried out in Burkina Faso with herbicides: 2,4-D acid in its amine form and Rilof. A cytological study of the parasite seeds subjected to herbicidal treatments coupled with the embryological study of the parasite is carried out. Rhamphicarpa capsules have a slightly tough seed coat with some poly embryos. Two treatments of 2,4D at the dose of 360 g a. i. ha-1 gave better results. The Rilof destroys the seeds and embryos contained in the capsules to a level lower than 2,4-D; it eliminates Rhamphicarpa plants from 78% to 92% comparated to 2.4-D which is 100%. In general, the success of a herbicide treatment depends largely on the time of application of the herbicide: -destruction of new Rhamphicarpa plants emerging from the first treatment and still in the vegetative state or at the beginning of flowering; -to prevent the flowering of new flowering axes established by the axillary buds of the rest of the stems of Rhamphicarpa still alive after the first treatment. This study resulted in a large amount of data having an agronomic impact, thus minimizing pollution of chemicals and decreasing the amount of seed produced and ultimately resulting in a decrease in the seed stock in the soil. Conclusion and application of the results:The chemical approach should be retained as one of the components of integrated pest management to contain this type of parasite within acceptable limits.
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