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Experiences of introduction of imidazolinone-resistant sunflower in Hungary from the herbological point of view

Summary
Sunflower growing area reached about 450,000-500,000 hectares in Hungary in the last few years. A weak point of weed control of sunflower is the application of herbicides mainly against Ambrosia artemisiifolia (Common ragweed) and Cirsium arvense. As Hungarian soils are highly infected with these weeds, there is a need to find more reliable and effective solutions on weed control of sunflower.
Clearfield-Technology on sunflower was introduced in the spring of 2005 in Hungary on about 40.000 hectares mainly with the hybrid Rimisol. The application of this new weed control technology was observed with high expectations from the practice.
Studies were carried out in July 2005 in North-West-Hungary on some sunflower fields and the efficiency of the IMI-technology has been evaluated.
We established that early post application of Pulsar 40 SL (imazamox) that gives new possibilities for the control of dangerous weeds in sunflower, but there are some more details that should be further tested e.g. the use of pre-emergence weed control before Pulsar application. Based on our studies we also concluded that application of imazamox gives high efficacy for the control of non-planted conventional sunflower (from previous crop, as weed) on IMI-sunflower fields.

german version

Keywords/Stichworte:Imidazolinone-resistant sunflower; imazamox; Pulsar 40 SL; Ambrosia artemisiifolia (L.); Cirsium arvense (L.); weed control

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Autor:S. NAGY, KWS RAGT Hybrid Kft. H-9027 Gyor, Gesztenyefa u. 4., e-mail: s.nagy@kws.de;
P. REISINGER, P. POMSÁR, Department of Plant Protection, University of West Hungary Faculty of Agricultural and Food Sciences, H 9200 Mosonmagyaróvár Kolbai K. u. 8., e-mail: reisinge@mtk.nyme.hu, pompet@mtk.nyme.hu

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