Economic Threshold for Wild Radish (Raphanus raphanistrum L.) Control in Wheat Fields

Authors : Özhan BOZ*

Pages : 173-177

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Publication Date : 2005-06-01

Article Type : Research Paper

Abstract :Field experiments were conducted in Aydın province in 1998 and 1999 to determine the economic threshold insert ignore into journalissuearticles values(ET); using florasulam + flumetsulam, 2,4-D amine, thifensulfuron methyl + tribenuron-methyl, and tribenuron-methyl for wild radish insert ignore into journalissuearticles values(Raphanus raphanistrum L.); in wheat. The effect of wild radish density insert ignore into journalissuearticles values(1, 2, 4, 8 and 16 plants m-2); on wheat yield was investigated using an adjacent plot design with 4 fields. For each weed density, yield was compared with that in the adjacent weed-free control plot. The grain yield in wild radish-free wheat was 4079 kg ha-1 in 1998, 4369 kg ha-1 in 1999 and 4224 kg ha-1 averaged over the 2 years. Results over the 2 years showed that the ET of wild radish in wheat varied from 1.8 to 2.0 plants m-2 depending on the herbicide applied. The lowest ET value was calculated for 2,4-D amine and the highest for florasulam + flumetsulam. It is therefore concluded that wild radish in wheat should be controlled by herbicides if the density is between 1.8 and 2.0 plants m-2. Below this level, a certain amount of damage and the presence of weeds can be tolerated, thus minimizing herbicide use.
Keywords : Wild radish Raphanus raphanistrum, , economic threshold, wheat Triticum aestivum, , florasulam flumetsulam, 2, 4 D amine, thifensulfuron methyl tribenuron met