International Journal of Agronomy

Research Article

Management Options and Factors Affecting Control of a Common Waterhemp (Amaranthus rudis) Biotype Resistant to Protoporphyrinogen Oxidase-Inhibiting Herbicides

Figure 1

Preemergence control of common waterhemp with acifluorfen ( 𝑦 = 1 . 4 0 6 3 𝑥 2 − 1 8 . 1 8 8 𝑥 + 7 1 . 4 3 8 , 𝑅 2 = 0 . 9 6 ), flumioxazin ( 𝑦 = 0 . 5 1 5 6 𝑥 2 − 1 2 . 9 3 1 𝑥 + 9 2 . 9 5 , 𝑅 2 = 0 . 9 9 ), fomesafen ( 𝑦 = − 1 . 7 5 𝑥 2 + 2 . 9 6 2 5 𝑥 + 8 6 . 8 6 2 , 𝑅 2 = 0 . 9 6 ), lactofen ( 𝑦 = 0 . 7 8 1 3 𝑥 2 − 1 3 . 5 6 3 𝑥 + 6 7 . 5 6 2 , 𝑅 2 = 0 . 7 6 ), sulfentrazone ( 𝑦 = − 0 . 8 2 0 3 𝑥 2 − 3 . 4 0 9 4 𝑥 + 9 3 . 5 5 6 , 𝑅 2 = 0 . 9 9 ), atrazine ( 𝑦 = − 1 . 8 7 5 𝑥 2 + 1 . 3 7 5 𝑥 + 9 0 . 8 7 5 , 𝑅 2 = 0 . 9 9 ), imazethapyr ( 𝑦 = − 0 . 2 3 4 4 𝑥 2 + 1 . 2 1 8 8 𝑥 + 0 . 5 6 2 5 , 𝑅 2 = 0 . 4 ), and isoxaflutole ( 𝑦 = − 0 . 0 7 8 1 𝑥 2 − 5 . 1 3 1 2 𝑥 + 9 4 . 9 8 7 , 𝑅 2 = 0 . 8 5 ) 28 days after planting when planted 0, 2, 4, and 6 weeks after the herbicide application. The vertical line represents the LSD ( 𝑃 = 0 . 0 5 ).
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