Management Options and Factors Affecting Control of a Common Waterhemp (Amaranthus rudis) Biotype Resistant to Protoporphyrinogen Oxidase-Inhibiting Herbicides
Table 4
Visual response, height reduction, and fresh-weight reduction of common waterhemp 21 d after applicationin the greenhouse.
Treatment
Rate
Resistant or nonresistant biotype
Control
Height reduction
Fresh-weight reduction
g ai/ha
%
Nontreated
Protox-resistant
0
0
0
Glyphosate + DAS
840
Protox-resistant
100
100
100
Lactofen + COC + DAS
220
Protox-resistant
6
19
24
Lactofen + COC + DAS
880
Protox-resistant
30
39
37
Sulfentrazone + DAS + COC
240
Protox-resistant
8
30
28
Acifluorfen + COC + DAS
420
Protox-resistant
10
25
29
Flumioxazin + COC + DAS
72
Protox-resistant
19
29
36
Fomesafen + COC + DAS
330
Protox-resistant
20
28
23
Imazethapyr + NIS
70
Protox-resistant
0
−17
−30
Mesotrione + COC + DAS
105
Protox-resistant
30
24
22
Atrazine + COC
1680
Protox-resistant
27
32
36
Nontreated
Nonresistant
0
0
0
Lactofen + COC + DAS
220
Nonresistant
100
100
100
LSD ()
19
21
22
Additives included crop-oil concentrate (COC) at 1.2 l/ha, diammonium sulfate (DAS) at 2.8 kg/ha, and nonionic surfactant (NIS) at 0.25% v/v.
