[目的]明确34%三氯吡氧乙酸丁氧基乙酯·双氟磺草胺乳油对小麦田一年生阔叶杂草的防效及其对作物的安全性。[方法]本试验采用苗后茎叶喷雾处理进行田间药效试验。[结果]34%三氯吡·双氟乳油于小麦苗后施用有效成分用量255~382.5...[目的]明确34%三氯吡氧乙酸丁氧基乙酯·双氟磺草胺乳油对小麦田一年生阔叶杂草的防效及其对作物的安全性。[方法]本试验采用苗后茎叶喷雾处理进行田间药效试验。[结果]34%三氯吡·双氟乳油于小麦苗后施用有效成分用量255~382.5 g a.i./hm^(2),即制剂用量为750~1125 g/hm^(2)时,可有效防治藜、铁苋菜、卷茎蓼、反枝苋、苍耳等多种一年生阔叶杂草,且药效持效期较长,对少量受害后未死亡残存杂草具有较强的后期生长抑制作用。施药后30 d调查,小麦田阔叶杂草总草株防效为87.1%~94.3%,鲜质量防效为88.3%~95.5%。试验药剂各剂量处理后观察,小麦整个生育期均未出现药害症状,且未见对其他生物及周边作物有影响。各药剂处理区与空白对照区比较增产显著,增产率达52.1%~70.4%。[结论]34%三氯吡·双氟乳油能够有效防除小麦田一年生阔叶杂草,且对小麦安全,推荐施用剂量范围为255~382.5 g a.i./hm^(2)(即制剂用量750~1125 g/hm^(2))。展开更多
Windmillgrass (Chloris verticillata Nutt.) is spreading from native areas, becoming problematic in established turf in Missouri, and surrounding states. Limited information is available regarding post-emergence (POST)...Windmillgrass (Chloris verticillata Nutt.) is spreading from native areas, becoming problematic in established turf in Missouri, and surrounding states. Limited information is available regarding post-emergence (POST) control options for turf. The objective of this research was to assess the visual and biomass response of windmillgrass to selected herbicides approved for use in turf. In one study, a greenhouse experiment was conducted with POST application of seven selected herbicides, including dimethylamine salt of quinclorac, fenoxaprop-P-ethyl, foramsulfuron, mesotrione, sulfentrazone, and topramezone in a tank-mixture with triclopyr, as well as a pre-packed product containing thiencarbazone-methyl, foramsulfuron, and halosulfuron-methyl. Under the same experimental conditions, five additional treatments, including mesotrione or topramezone applied at label-suggested rates alone or in combination with triclopyr, in addition to triclopyr alone, were applied to a second study on tillering windmillgrass. At 4 weeks after treatment (WAT), only fenoxaprop-p-ethyl consistently resulted in a complete control of windmillgrass. No measurable regrowth of plants was observed two weeks following the initial collection of windmillgrass aboveground biomass. In the second study, combinations of mesotrione and topramezone with triclopyr resulted in 100% visual injury of windmillgrass at 4 WAT;mesotrione and topramezone alone only resulted in up to 66% visual injury. Triclopyr alone resulted in 91% injury at 4 WAT. The greatest reduction of windmillgrass biomass and least amount of regrowth resulted from mesotrione and topramezone combinations with triclopyr. Control of windmillgrass is effective with fenoxaprop-P-ethyl alone, but use of a 4-Hydroxyphenylpyruvate dioxygenase (HPPD) inhibitor such as mesotrione and topramezone should include the addition of triclopyr.展开更多
文摘[目的]明确34%三氯吡氧乙酸丁氧基乙酯·双氟磺草胺乳油对小麦田一年生阔叶杂草的防效及其对作物的安全性。[方法]本试验采用苗后茎叶喷雾处理进行田间药效试验。[结果]34%三氯吡·双氟乳油于小麦苗后施用有效成分用量255~382.5 g a.i./hm^(2),即制剂用量为750~1125 g/hm^(2)时,可有效防治藜、铁苋菜、卷茎蓼、反枝苋、苍耳等多种一年生阔叶杂草,且药效持效期较长,对少量受害后未死亡残存杂草具有较强的后期生长抑制作用。施药后30 d调查,小麦田阔叶杂草总草株防效为87.1%~94.3%,鲜质量防效为88.3%~95.5%。试验药剂各剂量处理后观察,小麦整个生育期均未出现药害症状,且未见对其他生物及周边作物有影响。各药剂处理区与空白对照区比较增产显著,增产率达52.1%~70.4%。[结论]34%三氯吡·双氟乳油能够有效防除小麦田一年生阔叶杂草,且对小麦安全,推荐施用剂量范围为255~382.5 g a.i./hm^(2)(即制剂用量750~1125 g/hm^(2))。
文摘Windmillgrass (Chloris verticillata Nutt.) is spreading from native areas, becoming problematic in established turf in Missouri, and surrounding states. Limited information is available regarding post-emergence (POST) control options for turf. The objective of this research was to assess the visual and biomass response of windmillgrass to selected herbicides approved for use in turf. In one study, a greenhouse experiment was conducted with POST application of seven selected herbicides, including dimethylamine salt of quinclorac, fenoxaprop-P-ethyl, foramsulfuron, mesotrione, sulfentrazone, and topramezone in a tank-mixture with triclopyr, as well as a pre-packed product containing thiencarbazone-methyl, foramsulfuron, and halosulfuron-methyl. Under the same experimental conditions, five additional treatments, including mesotrione or topramezone applied at label-suggested rates alone or in combination with triclopyr, in addition to triclopyr alone, were applied to a second study on tillering windmillgrass. At 4 weeks after treatment (WAT), only fenoxaprop-p-ethyl consistently resulted in a complete control of windmillgrass. No measurable regrowth of plants was observed two weeks following the initial collection of windmillgrass aboveground biomass. In the second study, combinations of mesotrione and topramezone with triclopyr resulted in 100% visual injury of windmillgrass at 4 WAT;mesotrione and topramezone alone only resulted in up to 66% visual injury. Triclopyr alone resulted in 91% injury at 4 WAT. The greatest reduction of windmillgrass biomass and least amount of regrowth resulted from mesotrione and topramezone combinations with triclopyr. Control of windmillgrass is effective with fenoxaprop-P-ethyl alone, but use of a 4-Hydroxyphenylpyruvate dioxygenase (HPPD) inhibitor such as mesotrione and topramezone should include the addition of triclopyr.
