Alternatives to herbicide use in penoxsulam-resistant barnyardgrass management in paddy fields
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Abstract
Barnyardgrass is the most important weed and cause serious yield losses up to 80% in paddy fields. Farmers have observed that barnyardgrass cannot be successfully controlled by ALS-inhibitor herbicides. This study was established in representative rice growing areas at Lat Lum Kaeo District, Pathum Thani with the objective of illumination whether barnyardgrass populations developed resistance to ALS-inhibitors, penoxsulam. Barnyardgrass seeds were collected from farmer’s fields to determine the physiological response to penoxsulam under greenhouse condition. The experimental design was a split plot in completely randomized design (CRD) with four replications having six penoxsulam dose rates as main plot (0, 7.03, 14.06, 28.12, 56.24 and 112.48 g a.i./ha), and the sub plot was barnyardgrass of susceptible and resistant biotype. The experiment was treated with herbicides at 12 days after sowing (DAS). The susceptible and resistant biotype were examined on I50 base on visual injury and GR50 base on plant height and fresh weight. The resistance level of barnyardgrass was 18.08-84.87 fold higher than susceptible biotype. Then, the cross-resistant of penoxsulam-resistant barnyardgrass to ALS-inhibitors was determined. The experiment was conducted using CRD with four replications. The result presented that penoxsulam-resistant barnyardgrass was not controlled at the labeled rate of bispyribac-sodium, pyribenzoxim and triafamone. Additionally, multiple-resistance of penoxsulam-resistant barnyardgrass was defined across mode of action of herbicides. The alternative herbicides used to control penoxsulam-resistant barnyardgrass were controlled by profoxydim (Inhibitors of ACCase), propanil (Inhibitors of photosynthesis at PS II) and florpyrauxifen-benzyl (synthetic auxins) at the labelled rate. This suggested that farmers should rotate herbicides with difference of site of action and reduce the probability of penoxsulam-resistant barnyardgrass.
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References
จรรยา มณีโชติ, ปรัชญา เอกฐิน และ ยุรวรรณ อนันตนมณี. 2560. พื้นที่เสี่ยงต่อการระบาดของหญ้าข้าวนกที่มีกลไกความต้านทานต่อสารกำจัดวัชพืชแบบ multiple resistance ในนาข้าว. น. 2007-2019. ใน: รายงานผลงานวิจัยประจำปี 2560. สำนักวิจัยพัฒนาการอารักขาพืช กรมวิชาการเกษตร.
วัชรา มณฑาทิพย์, จำเนียร ชมภู และ ทศพล พรพรหม. 2560. หญ้าแดง (Ischaemum rugosum Salisb.) ต้านทานต่อสารบีสไพริแบค-โซเดียมในข้าวนาหว่านน้ำตม. น. 933-946. ใน: การประชุมวิชาการอารักขาพืชแห่งชาติ ครั้งที่ 13 ณ โรงแรมเรือรัษฎา จ.ตรัง.
สุตานันท์ โพธิ์สวัสดิ์, สุรพล ฉินทกานันท์, จำเนียร ชมพู และ ทศพล พรพรหม. 2558. การศึกษาหญ้าข้าวนกต้านทานสารบีสไพรีแบค-โซเดียมในนาหว่านน้ำตม. น. 116-117. ใน: การประชุมวิชาการอารักขาพืชแห่งชาติ ครั้งที่ 12. ณ โรงแรมดุสิต ไอส์แลนด์ รีสอร์ท จ.เชียงราย.
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