Testing possibilities for chemical control of Iva xanthifolia in soybean
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In the last few years the weed species Iva xanthifolia Nutt. has been intensively spreading from nonagricultural areas to crops, in Serbia-Vojvodina region. Danger from spreading of false ragweed is reflected in its robust look (over 2 in high), strong competition with the crop (uniform germination) and in very high seed production (up to 105,000 seeds/plant). In this paper we are presenting results of different possibilities of control of false ragweed in soybean crop. Area of the experiment contained natural weed infestation of false ragweed at about 400680 plants/m(2). Applications were made with 8 pre-emergent herbicides (single application and combinations of herbicides) after planting and before crop germination, and 16 post-emergent herbicides. Weather conditions improved the effect of soil herbicides, so the efficacy of all applied herbicides was between 89 and 100 %. For post-emergence applications, insufficient efficacy was observed with tifensulfuron-methyl and oxasulfuron (...one or split-application). Other compounds showed 98-100 % efficacy. Obtained results show that, even in strong infestations, control of false ragweed in soybean can be very effective.
Keywords:weed / Iva xanthifolia / false ragweed / herbicides / soybean
Source:Journal of Plant Diseases and Protection, 2006, 727-731
- Springer Heidelberg, Heidelberg