1. A comparison of sensitive reference populations of Apera spica-venti L. (P.B.) to ALS inhibiting iodosulfuron
- Author
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Gerowitt, Bärbel and Schulz, Andrea
- Subjects
Auflaufrate ,Biotest ,Herbizidresistenz ,sensitiver Standard ,Windhalm ,bioassay ,emergency rate ,herbicide resistance ,loose silky bentgrass ,susceptible reference ,Agriculture ,Botany ,QK1-989 - Abstract
Whole plant bioassays are the most widely used test method for herbicide resistant grass weed populations. In whole plant bioassays, a susceptible standard population is usually included into the test procedure as the basis of resistance classification. Many institutions use their own susceptible standard in Apera spica-venti herbicide resistance tests. In contrast to Alopecurus myosuroides there are no approved susceptible or resistant standard populations. That is one reason why results of different institutions can hardly be compared with each other. We investigated three susceptible standard populations of Central European institutions. Dose response curves of three populations to iodosulfuron showed that two could be replaced by each other. A third population reacted with high variances between replications because of its heterogeneous origin from different fields and hence populations. Four more test populations emerged too poorly for establishing a bioassay. Further greenhouse investigations on emergence of four different populations were conducted. There was no difference in emergence between temperatures observed, but between populations. The rates of emergence varied between 4 % and 43 %. The rate of emergence and the mean time for emergence were positively correlated.
- Published
- 2012
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