Table 3. Properties of the 16 herbicides in the same form as in Table 1.

Herbicides	MoAa)	Registration criteria (µg/L)	Primary producers			HC5 (µg/L)	HC50 (µg/L)
			ln Mean	ln SD	n
Cyhalofop-butyl	1	33	7.07	0.93	7	240 (50–500)	1200 (600–2300)
Sethoxydim	1	7200	10.38	0.88	10	7200 (2500–13000)	32000 (19000–53000)
Flucetosulfuron	2	7900	10.53	0.80	6	9200 (1900–19000)	37000 (19000–72000)
Trifluralin	3	24	3.65	1.19	9	5.1 (1.1–12)	38 (18–80)
Pendimethalin	3	14	5.62	2.13	11	7.5 (0.7–30)	280 (87–880)
2,4-D	4	9800	10.28	2.67	15	330 (31–1500)	29000 (8600–97000)
MCPA	4	6100	10.11	1.61	13	1600 (330–4300)	25000 (11000–54000)
Glyphosate	9	6200	10.74	0.82	13	12000 (5200–19000)	46000 (31000–69000)
Glufosinate	10	10000	10.45	2.81	11	290 (13–1800)	35000 (7400–160000)
Chloronitrofen	14	—b)	4.57	2.19	7	2.2 (0.056–13)	96 (19–480)
Asulam	18	9000	9.85	1.64	11	1200 (190–3400)	19000 (7700–46000)
Diquat	22	13	3.95	1.98	10	1.8 (0.16–6.9)	52 (16–160)
Chlorpropham	23	370	7.96	1.49	15	230 (63–540)	2900 (1500–5600)
Benzobicyclon	27	34	6.38	0.10	6	500 (410–540)	590 (550–640)
Dichlobenil	29	150	7.44	2.29	12	36 (3.2–150)	1700 (520–5600)
Oxaziclomefone	0	830	7.94	1.01	6	480 (66–1200)	2800 (1200–6500)

^a) HRAC²²⁾; 1: inhibition of acetyl CoA carboxylase; 2: inhibition of acetolactate synthase; 3: microtubule assembly inhibition; 4: auxin mimics; 9: inhibition of EPSP synthase; 10: inhibition of glutamine synthetase; 14: inhibition of protoporphyrinogen oxidase; 18: inhibition of dihydropteroate synthase; 22: photosystem-I-electron diversion; 23: inhibition of microtubule organization; 27: inhibition of 4-hydroxyphenyl-pyruvate-dioxygenase; 29: inhibition of cellulose synthesis; 0: unknown. ^b) Registration expired.