Delay in the critical time for weed removal in imidazolinone-resistant sunflower (Helianthus annuus) caused by application of pre-emergence herbicide
| Autor: | Sava Vrbničanin, Goran Malidza, Stevan Z. Knezevic, Milena Simić, Djordje Glamoclija, Igor Elezovic, Avishek Datta |
|---|---|
| Rok vydání: | 2013 |
| Předmět: |
0106 biological sciences
2. Zero hunger Critical time timing of weed removal crop competition Crop yield Crop growth 04 agricultural and veterinary sciences Pre emergence Biology weed interference Weed control 01 natural sciences Sunflower Agronomy integrated weed management Insect Science Helianthus annuus 040103 agronomy & agriculture 0401 agriculture forestry and fisheries Weed Agronomy and Crop Science herbicide-resistant crop 010606 plant biology & botany |
| Zdroj: | International Journal of Pest Management |
| ISSN: | 1366-5863 0967-0874 |
| DOI: | 10.1080/09670874.2013.830797 |
| Popis: | The critical time for weed removal (CTWR) is a period in the crop growth cycle when weed control must be initiated to prevent yield losses. Knowing the CTWR is useful for making decisions about the timing of weed control and in achieving efficient herbicide use from both biological and economic perspectives. Field studies were conducted in 2008 and 2009 at three locations in Serbia and one location in the USA to determine the CTWR in imidazolinone (IMI)-resistant sunflower grown with and without application of pre-emergence (PRE) herbicide. A four-parameter log-logistic model was fitted to data relating relative crop yield to increasing duration of weed presence. The CTWR without PRE herbicide treatment ranged from 14 to 26d after emergence (DAE) corresponding to the V3 (three leaves) to V4 stages compared to 25 to 37 DAE, which corresponded to the V6 to V8 stages with PRE herbicide. The CTWR in IMI-resistant sunflower grown with PRE herbicide can be delayed by an additional 6 to 12 d compared to the crop grown without PRE herbicide under the present experimental conditions. The practical implication of this study is that the use of PRE herbicide could extend post-herbicide treatments by another 6 to 12d with respect to the critical time required for weed removal without PRE herbicide in IMI-resistant sunflower. |
| Databáze: | OpenAIRE |
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