Use of different doses of glyphosate to control invasive plants: Bidens pilosa, Commelina benghalensis, Digitaria insularis, Ipomoea grandiofolia and Tridax procumbens
A. L. S. Lacerda, R. V. Filho, Z. M. Souza, J. Torres
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引用次数: 2
Abstract
Glyposhate is among the most widely used herbicides in Brazil and worldwide and has a broad spectrum of control, low toxicity, non-selective, and systemic action. In Brazil, it has been increasingly consumed after its release to be used in plants with tolerance to the product; however, excessive use has contributed to select resistant or tolerant weed species. Our goal was to evaluate the efficiency of weed control by using glyphosate in a growth chamber at different doses, periods of applications, and weed species. The experimental design was completely randomized – factorial scheme 7 x 5 – by assessing seven doses of glyphosate: 0; 720; 960; 1200; 1440; 1680, and 1920 g ha-1 i.a., in five weeds: black picket, bitter grass, bull herb, viola string, and ragged, with five repetitions. The weeds were sowed in polyethylene pots with three plants per pot. Assessments of dry biomass were conducted after 7, 14, and 21 days of application (DAA) with the treatment of glyphosate in scores from 0 to 100%. We concluded that the herbicide was efficient at controlling the black picket and bitter grass species as 100% of the weed plants 14 DAA died with the doses of 720 g ha-1 i.a. Doses of glyphosate required to reach indices of control above 915 were 1680 g ha-1 i.a. for ragged, 960 g ha-1 i.a. for bull herb, and 1440 g ha-1 i.a. for viola string at 21 DAA – since these are considered hard to control. It is recommended to apply 1440 g ha-1 i.a. of glyphosate for an effective control over 80% of all invasive plants assessed at 21 DAA,.
草甘膦是巴西和世界范围内使用最广泛的除草剂之一,具有广谱控制、低毒、非选择性和全身性作用。在巴西,它在释放后被越来越多地用于对该产品具有耐受性的植物中;然而,过量使用导致了抗性或耐受性杂草品种的选择。我们的目标是通过在生长室中使用不同剂量、施用时间和杂草种类的草甘膦来评估杂草控制的效率。实验设计为完全随机-因子方案7 × 5 -通过评估七种剂量的草甘膦:0;720;960;1200;1440;1680年和1920年,共有五种杂草:黑尖桩草、苦草、牛蒡草、中提琴弦和破草,重复五次。将杂草播种在聚乙烯花盆中,每盆三株。在草甘膦处理的第7、14和21天(DAA)后,对干生物量进行评分,评分范围从0到100%。我们得出结论,草甘膦对黑尖桩和苦草具有有效的控制作用,因为在720 g ha-1 i.a.的剂量下,14 DAA的杂草100%死亡。达到915以上的控制指数所需的草甘膦剂量为:锯齿草1680 g ha-1 i.a.,牛蒡草960 g ha-1 i.a.,中提琴在21 DAA时需要1440 g ha-1 i.a.,因为这些被认为难以控制。建议每天使用1440克草甘膦,以有效控制超过80%在21 DAA评估的所有入侵植物。