Evaluation of fumigant and non-fumigant nematicides for management of Rotylenchulus reniformis on sweetpotato

Nematicide active ingredients, application rates, application methods, and application timing for the sweetpotatoes field experiments conducted at LSU AgCenter Northeast Research Station in 2021 and 2022_ DBP refers to days before planting_

Product	Active Ingredient	Product Application Rate	Application Rate (a.i.)	Application Method	Application Timing
Telone II	1,3-dichloropropene	74.8 L/ha	84.9 kg/ha	Shank	21 DBP
Velum	Fluopyram	500 ml/ha	238 g/ha	In-furrow	2 DBP
Vydate	Oxamyl	18.7 L/ha	4.28 kg/ha	In-furrow	2 DBP
Salibro	Fluazaindolizine	2.24 L/ha	1.12 kg/ha	In-furrow	2 DBP
AgLogic	Aldicarb	16.8 kg/ha	2.52 kg/ha	In-furrow	2 DBP
Majestene	Bacterial metabolites	18.7 L/ha	-	In-furrow	2 DBP
Nimitz	Fluensulfone	8.18 L/ha	3.92 kg/ha	In-furrow	2 DBP

Effect of soil treatment and experimental repetition on the final abundance of reniform nematode (Rotylenchulus reniformis) in soil and storage root weight of sweetpotato planted into potted field soil from the LSU AgCenter Macon Ridge Research Station_ Soil treatments sharing the same letter within a column do not differ significantly (P > 0_05), according to Tukey's HSD test_

Factor	Level	Rotylenchulus reniformis per 500 ml soil	Storage Root Weight (g)
Soil Treatment	Untreated	13,790	a	29.8
	Pasteurized	2,155	c	32.1
	Fluopyram	10,560	ab	21.8
	Oxamyl	8,340	ab	30.5
	Fluazaindolizine	10,295	ab	36.0
	Aldicarb	6,575	b	31.1
	Majestene	11,055	ab	30.7
	Fluensulfone	6,890	b	28.4
Experiment	1	9,435		32.0
	2	8,025		28.0
P-value	Soil Treatment	0.045		0.530
	Experiment	0.136		0.188
	Interaction	0.749		0.701

2021 effect of soil treatment on the yield of US#1, canner, and jumbo grade sweetpotato harvest at the LSU AgCenter Northeast Research Station_ Soil treatments sharing the same letter within a column do not differ significantly (P > 0_05), according to Tukey's HSD test_

Soil Treatment	Yield (Mg/ha)
	U.S.#1		Canner	Jumbo	Total Marketable Yield
Control	6.8	ab	7.4	0.1	14.2
1,3-dichloropropene	9.2	a	6.5	1.0	16.7
Fluopyram	8.9	ab	9.1	0.4	18.4
Oxamyl	5.5	b	7.9	0.8	14.3
Fluazaindolizine	6.2	ab	8.3	0.5	15.0
Aldicarb	5.5	b	8.0	1.9	15.4
Majestene	9.6	a	8.1	0.3	18.0
Fluensulfone	7.0	ab	8.4	0.6	15.9
P-value	0.017		0.892	0.493	0.425

Effect of soil treatment and experimental repetition on the final abundanceof reniform nematode (Rotylenchulus reniformis) in soil and storage root weight of sweetpotato planted into potted field soil from the LSU AgCenter Northeast Research Station_ Soil treatments sharing the same letter within a column do not differ significantly (P > 0_05), according to Tukey's HSD test_

Factor	Level	Rotylenchulus reniformis per 500 ml soil		Storage Root Weight (g)
Soil Treatment	Untreated	31,060	a	15.5	b
	Pasteurized	3,515	c	19.0	ab
	Fluopyram	15,790	b	18.7	b
	Oxamyl	29,350	ab	17.6	b
	Fluazaindolizine	15,540	b	18.1	b
	Aldicarb	36,890	a	22.2	ab
	Majestene	29,110	ab	30.6	a
	Fluensulfone	29,400	ab	16.7	a
Experiment	1	18825	b	25.1	a
	2	35465	a	14.5	b
P-value	Soil Treatment	<0.001		0.005
	Experiment	<0.001		<0.001
	Interaction	0.122		0.073

2022 effect of soil treatment on the yield of US#1, canner, and jumbo grade sweetpotato harvest at the LSU AgCenter Northeast Research Station_ Soil treatments sharing the same letter within a column do not differ significantly (P > 0_05), according to Tukey's HSD test_

Soil Treatment	Yield (Mg/ha)
	U.S.#1		Canner	Jumbo	Total Marketable Yield
Control	7.4	b	3.4	1.8	12.6
1,3-dichloropropene	9.7	ab	4.4	3.0	17.1
Fluopyram	9.0	ab	3.7	1.0	13.6
Oxamyl	12.0	a	2.8	0.7	15.5
Fluazaindolizine	9.4	ab	3.6	3.5	16.5
Aldicarb	11.1	a	3.7	1.7	16.5
Majestene	9.2	ab	3.6	2.3	15.1
Fluensulfone	5.3	b	3.3	2.3	10.9
P-value	0.017		0.908	0.396	0.498

2021 effect of soil treatment on the abundance of reniform nematode (Rotylenchulus reniformis) in soil planted with sweetpotato at the LSU AgCenter Northeast Research Station in 2021_ Soil treatments sharing the same letter within a column do not differ significantly (P > 0_05), according to Tukey's HSD test_

Soil Treatment	Rotylenchulus reniformis per 500 ml soil
	Pre-Fum	At Plant		Mid-Season		Harvest
Control	4,125	1,188	a	5,575	a	5,875	a
1,3-dichloropropene	3,000	188	b	350	b	1,963	b
Fluopyram	4,625	1,750	a	1,825	b	2,575	b
Oxamyl	1,000	1,438	a	888	b	3,148	ab
Fluazaindolizine	4,625	1,500	a	3,170	ab	3,395	ab
Aldicarb	5,500	1,063	a	1,950	b	2,200	b
Majestene	1,625	1,250	a	2,468	ab	2,968	ab
Fluensulfone	3,500	1,625	a	3,188	ab	3,438	ab
P-value	0.193	0.014		<0.001		0.004

2022 effect of soil treatment on the abundance of reniform nematode (Rotylenchulus reniformis) in soil planted with sweetpotato at the LSU AgCenter Northeast Research Station in 2022_ Soil treatments sharing the same letter within a column do not differ significantly (P > 0_05), according to Tukey's HSD test_

Soil Treatment	Rotylenchulus reniformis per 500 ml soil
	Pre-Fum	At Plant		Mid-Season		Harvest
Control	1,425	1,500	a	3,000	ab	5,300
1,3-dichloropropene	1,000	300	b	1,175	b	3,015
Fluopyram	1,650	1,250	a	1,500	ab	3,800
Oxamyl	1,275	1,425	a	2,600	ab	4,775
Fluazaindolizine	975	925	ab	3,150	ab	4,050
Aldicarb	1,675	1,275	a	1,525	ab	2,375
Majestene	1,400	1,125	a	3,500	a	4,325
Fluensulfone	1,150	975	ab	2,025	ab	4,400
P-value	0.432	0.029		0.008		0.529