SOIL DEGREE DAY ACCUMULATION FOR NEMATODE CONTROL
RUSSET NORKOTAH, SLV RESEARCH CENTER - 2008


For root-knot nematode control, Vydate applications should begin at 800 Degree-days (DD_5Celcius)
or 1,440 DD_41Fahrenheit. To estimate that date, add the number of "Total DD" on the day you planted
to 800 (or 1,440). Where that value occurs in the "Total DD" column estimates the date on
which 800 DD_5C or 1,440 DD_41F will occur in that field.

Contacts for questions: Russ Ingham 541-737-5255
This information can also be found on the SLV Research Center Website:
http://www.colostate.edu/Depts/SLVRC/disease/nematode.htm

			These data were updated August 1, 2008
Data after that date are estimated using average temperature for the previous 7 days.
The last date when the Degree Days were updated is in bold.
											HISTORICAL				Avg.
		GROWING	AVE SOIL	DAILY	TOTAL	AVE SOIL	DAILY	TOTAL			TOTAL DD41F				2002-
MONTH	DAY	DAYS	TEMP - C	DD5C	DD5C	TEMP F	DD41F	DD41F	2007	2006	2005	2004	2003	2002	2007
1-May	1	1	13.5	8.5	8.5	56.2	15.2	15.2	17.1	15	10	10	0	0	8.7
2-May	2	2	11.0	6.0	14.4	51.7	10.7	26.0	34	31	18	18	9	10	19.9
3-May	3	3	11.4	6.4	20.8	52.6	11.6	37.5	51	49	26	26	18	21	31.9
4-May	4	4	12.9	7.9	28.8	55.3	14.3	51.8	67.1	68	37	37	27	35	45.2
5-May	5	5	14.2	9.2	38.0	57.6	16.6	68.4	81.8	87	48	48	36	49	58.3
6-May	6	6	14.6	9.6	47.6	58.3	17.3	85.7	93.7	105	60	60	45	61	70.8
7-May	7	7	15.1	10.1	57.7	59.1	18.1	103.8	107	123	72	72	54	76	84.0
8-May	8	8	14.7	9.7	67.4	58.5	17.5	121.3	123	142	84	84	63	92	97.9
9-May	9	9	14.0	9.0	76.3	57.1	16.1	137.4	140	160	98	98	72	106	112.6
10-May	10	10	14.3	9.3	85.7	57.8	16.8	154.2	159	176	115	115	81	120	127.6
11-May	11	11	14.2	9.2	94.9	57.6	16.6	170.9	181	193	131	131	90	137	143.9
12-May	12	12	15.4	10.4	105.3	59.7	18.7	189.6	203	212	146	146	101	157	160.9
13-May	13	13	15.1	10.1	115.5	59.3	18.3	207.8	225	233	162	162	115	175	178.6
14-May	14	14	13.9	8.9	124.3	56.9	15.9	223.7	247	254	179	179	130	194	197.0
15-May	15	15	14.3	9.3	133.6	57.8	16.8	240.6	268	276	197	197	146	213	216.1
16-May	16	16	14.2	9.2	142.8	57.5	16.5	257.1	289	300	224	224	163	234	238.8
17-May	17	17	15.7	10.7	153.6	60.3	19.3	276.4	309	323	244	244	181	254	259.0
18-May	18	18	16.7	11.7	165.3	62.1	21.1	297.5	331	348	263	263	201	275	280.2
19-May	19	19	17.9	12.9	178.2	64.3	23.3	320.8	355	373	286	286	220	297	302.8
20-May	20	20	18.6	13.6	191.9	65.5	24.5	345.4	377	398	310	310	238	317	325.1
21-May	21	21	19.0	14.0	205.9	66.2	25.2	370.5	396	425	335	335	255	338	347.3
22-May	22	22	16.9	11.9	217.8	62.5	21.5	392.0	414	449	361	361	274	358	369.3
23-May	23	23	14.9	9.9	227.7	58.8	17.8	409.8	429	471	387	387	296	375	391.0
24-May	24	24	14.1	9.1	236.8	57.5	16.5	426.2	443	495	415	415	321	392	413.4
25-May	25	25	15.6	10.6	247.4	60.0	19.0	445.3	458	522	442	442	346	410	436.7
26-May	26	26	17.0	12.0	259.4	62.6	21.6	466.9	476	550	469	469	369	429	460.3
27-May	27	27	17.8	12.8	272.1	64.0	23.0	489.8	496	577	496	496	391	449	484.0
28-May	28	28	18.1	13.1	285.2	64.5	23.5	513.4	518	619	522	522	413	470	510.5
29-May	29	29	17.9	12.9	298.1	64.3	23.3	536.6	540	646	548	548	437	492	534.8
30-May	30	30	18.3	13.3	311.4	64.9	23.9	560.5	562	674	571	571	463	516	559.4
31-May	31	31	19.2	14.2	325.6	66.5	25.5	586.0	584	702	595	595	489	542	584.4
1-Jun	1	32	19.9	14.9	340.5	67.9	26.9	612.9	607	732	619	619	513	570	609.9
2-Jun	2	33	19.7	14.7	355.2	67.5	26.5	639.3	631	762	644	644	535	598	635.6
3-Jun	3	34	19.8	14.8	370.0	67.7	26.7	666.0	654	793	669	669	557	622	660.6
4-Jun	4	35	19.7	14.7	384.7	67.5	26.5	692.5	676	825	691	691	578	641	683.7
5-Jun	5	36	18.8	13.8	398.5	65.8	24.8	717.3	698	858	714	714	599	660	706.9
6-Jun	6	37	17.2	12.2	410.7	62.9	21.9	739.2	721	892	737	737	619	681	731.3
7-Jun	7	38	18.7	13.7	424.3	65.6	24.6	763.8	742	925	762	762	639	702	755.2
8-Jun	8	39	19.7	14.7	439.0	67.4	26.4	790.2	764	950	784	785	659	726	778.0
9-Jun	9	40	19.1	14.1	453.1	66.3	25.3	815.5	787	973	803	809	681	754	801.1
10-Jun	10	41	18.7	13.7	466.7	65.6	24.6	840.1	812	998	823	833	704	778	824.8
11-Jun	11	42	16.4	11.4	478.1	61.5	20.5	860.6	837	1027	844	856	728	804	849.3
12-Jun	12	43	15.3	10.3	488.4	59.5	18.5	879.0	862	1059	864	880	749	829	874.0
13-Jun	13	44	16.8	11.8	500.2	62.2	21.2	900.3	883	1088	888	903	773	851	898.0
14-Jun	14	45	19.1	14.1	514.2	66.3	25.3	925.6	905	1114	914	927	795	878	922.2
15-Jun	15	46	20.4	15.4	529.6	68.7	27.7	953.3	929	1140	940	951	815	905	946.7
16-Jun	16	47	18.5	13.5	543.1	65.2	24.2	977.5	956	1164	968	975	838	928	971.5
17-Jun	17	48	17.2	12.2	555.2	62.9	21.9	999.4	984	1187	993	998	862	953	996.2
18-Jun	18	49	19.7	14.7	569.9	67.4	26.4	1025.7	1013	1215	1021	1022	883	978	1022.0
19-Jun	19	50	20.4	15.4	585.3	68.7	27.7	1053.5	1037	1247	1052	1045	907	1003	1048.4
20-Jun	20	51	19.3	14.3	599.6	66.7	25.7	1079.2	1066	1276	1084	1069	927	1029	1075.1
21-Jun	21	52	19.2	14.2	613.7	66.5	25.5	1104.7	1096	1303	1114	1093	946	1057	1101.4
22-Jun	22	53	18.2	13.2	626.9	64.8	23.8	1128.4	1120	1331	1139	1116	965	1085	1126.0
23-Jun	23	54	16.8	11.8	638.7	62.2	21.2	1149.7	1148	1357	1165	1140	984	1109	1150.7
24-Jun	24	55	16.4	11.4	650.1	61.4	20.4	1170.1	1179	1384	1191	1164	1005	1135	1176.1
25-Jun	25	56	16.3	11.3	661.3	61.3	20.3	1190.4	1210	1412	1214	1187	1028	1160	1201.9
26-Jun	26	57	16.0	11.0	672.3	60.7	19.7	1210.1	1240	1436	1236	1211	1051	1186	1226.7
27-Jun	27	58	17.1	12.1	684.4	62.8	21.8	1231.8	1265	1455	1262	1235	1072	1210	1249.9
28-Jun	28	59	18.0	13.0	697.3	64.3	23.3	1255.2	1292	1477	1287	1258	1096	1236	1274.4
29-Jun	29	60	18.6	13.6	710.9	65.5	24.5	1279.6	1320	1501	1309	1282	1121	1262	1299.2
30-Jun	30	61	16.7	11.7	722.6	62.1	21.1	1300.7	1345	1525	1335	1306	1144	1286	1323.4
1-Jul	1	62	16.7	11.7	734.3	62.0	21.0	1321.7	1373	1552	1361	1329	1169	1311	1349.0
2-Jul	2	63	18.1	13.1	747.3	64.5	23.5	1345.2	1404	1579	1385	1353	1193	1339	1375.5
3-Jul	3	64	17.5	12.5	759.8	63.4	22.4	1367.6	1435	1604	1411	1377	1219	1367	1402.1
4-Jul	4	65	17.5	12.5	772.3	63.5	22.5