Effect of Insecticide Seed Treatment on Safening Rice from Reduced Rates of Glyphosate and Imazethapyr

Table 3

Impact of seed treatment on rice height, percent of heading, and yield following applications of imazethapyr (Newpath) or glyphosate (Roundup PowerMax) in 2013 and 2014.

Insecticide	Herbicide	Rate	2013						2014
			Height		Heading		Yield		Height		Heading		Yield
			14 WAT		14 WAT				14 WAT		14 WAT
		g ai/ha	cm		%		bu/A		cm	SE	%	SE	bu/A	SE
Nontreated	None	—	89	a	85	abc	147	ab	105	1	99	1	207	5
	Glyphosate	39.42	90	a	58	de	104	d	104	1	100	0	199	9
		78.76	82	a	68	cd	113	cd	104	0	98	1	197	4
		157.54	59	bc	28	fg	58	ef	102	1	99	0	194	7
	Imazethapyr	4.39	77	ab	45	ef	70	e	104	1	100	0	197	3
		8.74	54	c	23	g	36	fg	101	1	100	0	192	4
		17.49	2	d	5	h	17	g	97	1	99	1	182	7
Treated	None	—	90	a	91	a	169	a	107	1	99	0	217	7
	Glyphosate	39.42	97	a	79	abc	148	ab	104	1	97	2	198	5
		78.76	90	a	73	bcd	144	ab	109	0	97	1	197	7
		157.54	88	a	73	bcd	128	bcd	104	1	100	0	195	7
	Imazethapyr	4.39	93	a	86	ab	170	a	104	1	100	0	198	3
		8.74	84	a	68	cd	136	bc	107	1	98	1	198	1
		17.49	76	ab	14	gh	45	ef	104	1	99	0	190	4

Means followed by the same letter are not statistically different according to Fisher’s protected LSD ().
Timings that did not meet the assumptions of ANOVA are reported as means followed by the standard error of the mean (SE).
“Nontreated” means the rice seed received fungicide only and no insecticide seed treatment whereas “treated” means the rice seed was treated with 198 g/45 kg of CruiserMaxx Rice.
Glyphosate rates are in “g ae/ha.”