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Paper Information

Journal:   IRANIAN JOURNAL OF WEED SCIENCE   2011 , Volume 7 , Number 2; Page(s) 77 To 88.
 
Paper: 

INVESTIGATION OF WILD OAT (AVENA LUDOVICIANA) BIOTYPES RESISTANCE TO THE CLODINAFOPPROPARGYL, PINOXADEN HERBICIDES AND THEIR MIXTURE

 
 
Author(s):  NAJAFI ZEINAB, ESLAMI SEYED VAHID, ZAND ESKANDAR
 
* 
 
Abstract: 

In order to evaluate the resistance of wild oat bitypes to clodinafop-propargyle, pinoxaden and their mixture (traxos), collected from Fars and Khoozestan provinces, pot and Petri dish bioassay studies were conducted on 8 suspected to resistance wild oat biotypes as well as one susceptible biotype at Iranian Research Institute of Plant Protection during 2008-2009. In pot bioassay experiments which were conducted as RCBD with four replications, wild oat plants were sprayed during 2-4 leaves stage using 0.25-16 times the recommended dose. Based on herbicide recommended rates (0.8, 0.45 and 1.5 l/ha for clodinafop-propargyle, pinoxaden and traxos, respectively), the applied doses were 0, 16, 32, 64, 128, 256, 512 and 1024 g ai ha-1 for clodinafop-propargyle, 11.25, 22.5, 45, 90, 180, 360 and 720 g ai ha-1 for pinoxaden and 16.87, 33.75, 67.5, 135, 270, 540 and 1080 g ai ha-1 for traxos. In Petri dish bioassay studies, after determination of discriminating dose for each herbicide (0.05, 0.03 and 0.01 mg ai/l for clodinafop-propargyle, pinoxaden and traxos respectively), dose response experiments using 0.25-16 times of the discriminating dose were conducted on germinated seeds. The results indicated that all biotypes was resistant to clodinafop propargyl and cross resistance to clodinafoppropargyle, pinoxaden and their mixture (traxos) in Khoozestan populations were confirmed. Greater than 37% of biotypes were controlled by pinoxaden or traxos herbicides and the resistance level of all biotypes to traxos was lower than other herbicides.

 
Keyword(s): CROSS RESISTANCE, DISCRIMINATE DOSE, DOSE-RESPONSE
 
References: 
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