Donnie K. Miller, Jason A. Bond, Thomas R. Butts, L. C. Webster, K. B. Kouamé
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引用次数: 0
摘要
Tiafenacil 是一种新型非选择性原卟啉原 IX 氧化酶 (PPO) 抑制性除草剂,具有禾本科和阔叶类除草活性,标示用于玉米、棉花、大豆和小麦的播种前施用。在美国中南部,早稻出苗和生长期往往与棉花和大豆播种前施用除草剂的时间相吻合,从而增加了除草剂从邻近田块向目标外移动的机会。我们进行了田间研究,以确定噻虫嗪(噻虫嗪最低标签施用量 24.64 g ai ha-1 的 12.5% 至 0.4%)施用于 1 叶或 3 叶(lf)水稻是否会产生有害影响。处理后 1 周(WAT),1-叶片和 3-叶片生长阶段的目视伤害范围分别为 50% 至 7% 和 20% 至 2%,而在 2 WAT 时,这些伤害范围分别为 13% 至 2%,未观察到伤害。噻虫嗪的施用量不会对整个季节产生负面影响,因为所观察到的早期视觉伤害并不表现为水稻在 2 WAT 期高度或糙米产量的降低。应避免在水稻生长早期的无性阶段直接施用噻虫嗪,否则会造成视觉伤害。不过,在发生脱靶移动的情况下,假定提供了适当的生长条件和农艺/病虫害管理,受影响的水稻有望完全恢复,对生长和产量不会产生影响。
Impact of reduced rates of tiafenacil at vegetative growth stages on rice growth and yield
Tiafenacil is a new non-selective protoporphyrinogen IX oxidase (PPO)-inhibiting herbicide with both grass and broadleaf activity labeled for preplant application to corn, cotton, soybean, and wheat. Early season rice emergence and growth often coincide in the mid-southern U.S. with preplant herbicide application in cotton and soybean, thereby increasing the opportunity for off-target herbicide movement from adjacent fields. Field studies were conducted to identify any deleterious impacts of reduced rates of tiafenacil (12.5 to 0.4% of the lowest labeled application rate of 24.64 g ai ha-1) applied to 1- or 3-leaf (lf) rice. Visual injury 1 week after treatment (WAT) for the 1- and 3-lf growth stages ranged from 50 to 7% and 20 to 2%, respectively, while at 2 WAT these respective ranges were 13 to 2% and no injury observed. Tiafenacil at applied rates had no negative season-long impact as early season visual injury observed was not manifested in a reduction in rice height 2 WAT or rough rice yield. Application of tiafenacil directly adjacent to rice in early vegetative stages of growth should be avoided as visual injury will occur. In cases where off-target movement does occur, however, impacted rice should be expected to fully recover with no impact on growth and yield, assuming adequate growing conditions and agronomic/pest management are provided.
期刊介绍:
Weed Technology publishes original research and scholarship in the form of peer-reviewed articles focused on understanding how weeds are managed.
The journal focuses on:
- Applied aspects concerning the management of weeds in agricultural systems
- Herbicides used to manage undesired vegetation, weed biology and control
- Weed/crop management systems
- Reports of new weed problems
-New technologies for weed management and special articles emphasizing technology transfer to improve weed control
-Articles dealing with plant growth regulators and management of undesired plant growth may also be accepted, provided there is clear relevance to weed science technology, e.g., turfgrass or woody plant management along rights-of-way, vegetation management in forest, aquatic, or other non-crop situations.
-Surveys, education, and extension topics related to weeds will also be considered