EVALUATION ON COST AND EFFICACY OF HERBICIDES TO ERADICATE MERREMIA PELTATA IN IMMATURE OIL PALM AT KINABATANGAN REGION

The Planter Pub Date : 2019-09-25 DOI:10.56333/tp.2019.010
A. Aban, Muhammad Faiz Zainal, MD Muslim MD SEIN, Teck Fah Lee
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Abstract

Merremia peltata is a perennial vine with large underground tuber. The smooth stem can climb to more than 20 m long and twine at the tips. A humid tropic up to 700 m sea level provides suitable habitat to the Merremia peltata seeds to sprout with fast growth rates. In Sabah, it is commonly found in the immature oil palm field and has become a type of endemic weed competing with the leguminous cover crops. Removal and eradication of these weeds are observed to be labour intensive, costly due to multiple rounds of herbicide treatment needed and most importantly, may impede oil palm growth if it is not adequately controlled. Merremia peltata is found to grow in Genting Plantations Berhad (GENP) estates in Kinabatangan region. A trial was conducted on hilly terrain planted with immature oil palm of 2 years old with the objective to evaluate the various types of herbicides (systemic and contact) to control Merremia peltata up to the extent of when the subsequent spraying is necessary. The annual rainfall recorded was around 3 000 mm. Equipment used in the trial was the Conventional Knapsack Sprayer (CKS), 16 L sprayer calibrated to 450 L for blanket spraying fitted with LSA/4 (green) nozzle. A range of single herbicides was evaluated and ranked accordingly to the results based on the product efficacy as well as cost-effectiveness. The herbicide treatments were MSMA+ diuron (2.3 and 3. 0 L/ha), glufosinate-ammonium (3.3 L/ha), MSMA (2.8 and 3.9 Llha), metsulfuron-methyl (250 and 350 g/ha) and triclopyr (1.5 and 2.0 L/ha). The post-treatment analysis was carried out based on visual observation at 1, 2, 4, 8, 12 and 16 weeks after treatment (WAT) on the percentage of Merremia killed and incidence of regeneration or no effect (0% = no effect I full regeneration, 100% = complete kill). Seven out of ten treatments recorded 100 per cent kill at 4 weeks after treatment. Triclopyr being the best treatment, giving more than 90 per cent kill as early as 2 WAT up to 8 WAT with more effective control contributing to the lowest regeneration stage at 5 per cent. Triclopyr was also the most cost-effective treatment estimated at RMI 3.95 per treated hectare (50 ml/ 16 L water) compared with other type of herbicides. MSMA+ diuron and glufosinate-ammonium were ranked the second and third herbicides whose results were similar to triclopyr but with higher cost per treated hectare ranging from RM25 - RM45. Overall, subsequent round of herbicides treatment would be required every 3 months to control Merremia peltata. Keynote: Merremia peltata, immature oil palm, herbicide evaluation.
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基那巴丹甘地区未成熟油棕棕叶小黄头虫除草剂的成本和效果评价
石竹是一种多年生藤本植物,地下块茎较大。光滑的茎可以长到20多米长,顶端缠绕在一起。海拔高达700米的潮湿热带地区为peltata种子提供了适宜的栖息地,以快速的生长速度发芽。在沙巴,它常见于未成熟的油棕田,并已成为一种地方性杂草,与豆科覆盖作物竞争。据观察,清除和根除这些杂草是劳动密集型的,由于需要多轮除草剂处理,成本很高,最重要的是,如果没有得到充分控制,可能会阻碍油棕的生长。在Kinabatangan地区的Genting plantation Berhad (GENP)庄园中发现了Merremia peltata。在丘陵地带进行了一项试验,种植了2年树龄的未成熟油棕,目的是评估不同类型的除草剂(系统除草剂和接触除草剂)在必要的后续喷洒程度下对大叶绿腹草的控制效果。录得的年雨量约为3 000毫米。试验中使用的设备是传统的背负式喷雾器(CKS), 16升的喷雾器校准到450升,用于配备LSA/4(绿色)喷嘴的毯子喷涂。根据产品功效和成本效益对一系列单一除草剂进行了评价和排序。除草剂处理为MSMA+ diuron(2.3和3)。0升/公顷)、草铵膦(3.3升/公顷)、MSMA(2.8和3.9升/公顷)、甲磺隆-甲基(250和350克/公顷)和三氯吡虫啉(1.5和2.0升/公顷)。在治疗后1、2、4、8、12、16周(WAT)采用目测法分析治疗后mermera的杀灭率、再生或无效果发生率(0% =无效果1完全再生,100% =完全杀灭)。在治疗4周后,十分之七的治疗记录了100%的死亡率。三氯吡啶是最好的处理,早在2 WAT到8 WAT就有90%以上的杀虫率,更有效的控制有助于最低再生阶段的5%。与其他类型的除草剂相比,三氯吡啶也是最具成本效益的处理,估计每处理公顷(50毫升/ 16升水)RMI 3.95。MSMA+ diuron和草铵膦被评为第二和第三除草剂,其效果与三氯吡虫啉相似,但每公顷处理成本更高,在25 - 45令吉之间。总体而言,后续每3个月需要进行一轮除草剂处理,以控制绿腹草。主题演讲:海螺,未成熟油棕,除草剂评价。
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