SOIL DEGREE DAY ACCUMULATION FOR NEMATODE CONTROL
RUSSET NORKOTAH, SLV RESEARCH CENTER - 2011
For root-knot nematode control, Vydate applications should begin at 800 Degree-days (DD5Celcius)
or 1,440 DD41Fahrenheit.  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 DD5C or 1,440 DD41F will occur in that field.
Contacts for questions: Russ Ingham 541-737-5255
			Rob Davidson 719-754-3494 ext. 15
			Andrew Houser 719-754-3494 ext. 26
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 8, 2011
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.
										Avg.							HISTORICAL
		GROWING	AVE SOIL	DAILY	TOTAL	AVE SOIL	DAILY	TOTAL		2002-							TOTAL DD41F
MONTH	DAY	DAYS	TEMP - C	DD5C	DD5C	TEMP F	DD41F	DD41F		2010		2010	2009	2008	2007	2006	2005	2004	2003	2002
1-May	1	1	10.6	5.6	5.6	51.1	10.1	10.1		10.4		9.9	16.0	15.2	17.1	15	10	10	0	0
2-May	2	2	8.2	3.2	8.9	46.8	5.8	16.0		21.9		19.6	32.4	26.0	34	31	18	18	9	10
3-May	3	3	9.7	4.7	13.6	49.4	8.4	24.4		34.1		31.8	46.5	37.5	51	49	26	26	18	21
4-May	4	4	12.0	7.0	20.5	53.6	12.6	37.0		48.0		47.5	61.6	51.8	67.1	68	37	37	27	35
5-May	5	5	13.2	8.2	28.7	55.7	14.7	51.7		62.4		65.0	78.1	68.4	81.8	87	48	48	36	49
6-May	6	6	14.3	9.3	38.0	57.8	16.8	68.5		76.7		83.1	96.3	85.7	93.7	105	60	60	45	61
7-May	7	7	15.6	10.6	48.6	60.1	19.1	87.5		91.8		102.1	116.4	103.8	107	123	72	72	54	76
8-May	8	8	15.8	10.8	59.4	60.4	19.4	106.9		107.7		122.3	138.0	121.3	123	142	84	84	63	92
9-May	9	9	15.7	10.7	70.1	60.3	19.3	126.2		124.1		144.0	159.8	137.4	140	160	98	98	72	106
10-May	10	10	14.9	9.9	80.0	58.8	17.8	144.0		140.9		165.9	182.1	154.2	159	176	115	115	81	120
11-May	11	11	14.7	9.7	89.8	58.5	17.5	161.6		158.4		185.7	205.2	170.9	181	193	131	131	90	137
12-May	12	12	13.4	8.4	98.2	56.2	15.2	176.8		176.6		205.4	228.7	189.6	203	212	146	146	101	157
13-May	13	13	14.9	9.9	108.1	58.8	17.8	194.6		195.2		224.8	252.6	207.8	225	233	162	162	115	175
14-May	14	14	15.6	10.6	118.7	60.1	19.1	213.7		214.1		244.6	276.9	223.7	247	254	179	179	130	194
15-May	15	15	15.9	10.9	129.6	60.6	19.6	233.3		233.5		263.6	301.2	240.6	268	276	197	197	146	213
16-May	16	16	16.8	11.8	141.5	62.3	21.3	254.6		255.7		285.1	326.1	257.1	289	300	224	224	163	234
17-May	17	17	16.9	11.9	153.4	62.5	21.5	276.1		276.9		309.2	352.1	276.4	309	323	244	244	181	254
18-May	18	18	15.8	10.8	164.2	60.4	19.4	295.5		299.0		332.8	379.4	297.5	331	348	263	263	201	275
19-May	19	19	14.2	9.2	173.4	57.6	16.6	312.1		321.9		353.9	405.5	320.8	355	373	286	286	220	297
20-May	20	20	12.8	7.8	181.2	55.1	14.1	326.2		345.1		378.0	431.5	345.4	377	398	310	310	238	317
21-May	21	21	13.2	8.2	189.5	55.8	14.8	341.1		368.3		405.1	455.7	370.5	396	425	335	335	255	338
22-May	22	22	13.8	8.8	198.3	56.8	15.8	356.9		391.1		433.0	479.1	392.0	414	449	361	361	274	358
23-May	23	23	14.4	9.4	207.7	58.0	17.0	373.9		413.2		461.6	501.5	409.8	429	471	387	387	296	375
24-May	24	24	14.9	9.9	217.6	58.8	17.8	391.7		435.4		488.8	523.6	426.2	443	495	415	415	321	392
25-May	25	25	15.7	10.7	228.3	60.3	19.3	411.0		458.2		514.4	544.2	445.3	458	522	442	442	346	410
26-May	26	26	16.9	11.9	240.2	62.4	21.4	432.3		481.5		541.5	563.6	466.9	476	550	469	469	369	429
27-May	27	27	17.8	12.8	252.9	64.0	23.0	455.3		505.5		571.5	584.0	489.8	496	577	496	496	391	449
28-May	28	28	18.4	13.4	266.3	65.1	24.1	479.4		532.1		604.8	607.7	513.4	518	619	522	522	413	470
29-May	29	29	19.3	14.3	280.7	66.8	25.8	505.2		557.5		638.5	633.0	536.6	540	646	548	548	437	492
30-May	30	30	19.0	14.0	294.7	66.3	25.3	530.5		582.8		671.0	657.6	560.5	562	674	571	571	463	516
31-May	31	31	18.2	13.2	307.9	64.8	23.8	554.2		608.6		703.6	681.6	586.0	584	702	595	595	489	542
1-Jun	1	32	19.0	14.0	321.9	66.2	25.2	579.4		634.7		736.0	703.7	612.9	607	732	619	619	513	570
2-Jun	2	33	19.1	14.1	336.1	66.5	25.5	604.9		660.7		768.3	724.8	639.3	631	762	644	644	535	598
3-Jun	3	34	19.3	14.3	350.4	66.8	25.8	630.7		686.2		802.3	743.6	666.0	654	793	669	669	557	622
4-Jun	4	35	19.9	14.9	365.3	67.8	26.8	657.5		710.9		838.4	764.5	692.5	676	825	691	691	578	641
5-Jun	5	36	20.3	15.3	380.6	68.5	27.5	685.0		735.8		877.0	787.1	717.3	698	858	714	714	599	660
6-Jun	6	37	20.8	15.8	396.4	69.4	28.4	713.4		761.7		916.9	811.2	739.2	721	892	737	737	619	681
7-Jun	7	38	21.0	16.0	412.3	69.7	28.7	742.2		787.4		956.1	835.3	763.8	742	925	762	762	639	702
8-Jun	8	39	20.7	15.7	428.0	69.3	28.3	770.5		811.4		984.7	859.6	790.2	764	950	784	785	659	726
9-Jun	9	40	21.0	16.0	444.0	69.8	28.8	799.3		835.4		1011.1	885.7	815.5	787	973	803	809	681	754
10-Jun	10	41	20.8	15.8	459.9	69.5	28.5	827.8		859.2		1040.3	903.9	840.1	812	998	823	833	704	778
11-Jun	11	42	21.2	16.2	476.1	70.2	29.2	857.0		882.7		1066.9	920.7	860.6	837	1027	844	856	728	804
12-Jun	12	43	21.1	16.1	492.2	69.9	28.9	885.9		905.4		1086.9	938.8	879.0	862	1059	864	880	749	829
13-Jun	13	44	20.7	15.7	507.9	69.3	28.3	914.2		928.3		1109.2	957.4	900.3	883	1088	888	903	773	851
14-Jun	14	45	16.4	11.4	519.2	61.4	20.4	934.6		951.9		1130.5	978.3	925.6	905	1114	914	927	795	878
15-Jun	15	46	19.0	14.0	533.2	66.2	25.2	959.8		976.0		1150.5	999.7	953.3	929	1140	940	951	815	905
16-Jun	16	47	20.9	15.9	549.1	69.5	28.5	988.4		1000.1		1172.4	1021.9	977.5	956	1164	968	975	838	928
17-Jun	17	48	20.9	15.9	564.9	69.5	28.5	1016.9		1024.6		1198.6	1046.6	999.4	984	1187	993	998	862	953
18-Jun	18	49	20.4	15.4	580.3	68.6	27.6	1044.5		1050.0		1223.3	1069.7	1025.7	1013	1215	1021	1022	883	978
19-Jun	19	50	20.7	15.7	595.9	69.2	28.2	1072.7		1075.9		1246.8	1092.4	1053.5	1037	1247	1052	1045	907	1003
20-Jun	20	51	18.7	13.7	609.6	65.6	24.6	1097.3		1102.1		1274.1	1115.0	1079.2	1066	1276	1084	1069	927	1029
21-Jun	21	52	17.3	12.3	621.8	63.1	22.1	1119.3		1127.9		1300.7	1137.1	1104.7	1096	1303	1114	1093	946	1057
22-Jun	22	53	20.0	15.0	636.8	67.9	26.9	1146.2		1151.8		1321.6	1160.0	1128.4	1120	1331	1139	1116	965	1085
23-Jun	23	54	22.2	17.2	654.0	72.0	31.0	1177.2		1175.7		1345.6	1182.0	1149.7	1148	1357	1165	1140	984	1109
24-Jun	24	55	19.6	14.6	668.6	67.3	26.3	1203.5		1200.7		1370.9	1209.0	1170.1	1179	1384	1191	1164	1005	1135
25-Jun	25	56	18.1	13.1	681.7	64.6	23.6	1227.1		1225.6		1393.3	1235.2	1190.4	1210	1412	1214	1187	1028	1160
26-Jun	26	57	19.2	14.2	695.9	66.6	25.6	1252.6		1249.4		1416.4	1257.8	1210.1	1240	1436	1236	1211	1051	1186
27-Jun	27	58	19.8	14.8	710.7	67.6	26.6	1279.3		1272.3		1440.8	1279.3	1231.8	1265	1455	1262	1235	1072	1210
28-Jun	28	59	21.3	16.3	727.0	70.3	29.3	1308.6		1296.6		1466.0	1301.6	1255.2	1292	1477	1287	1258	1096	1236
29-Jun	29	60	19.2	14.2	741.2	66.6	25.6	1334.2		1321.2		1489.3	1327.1	1279.6	1320	1501	1309	1282	1121	1262
30-Jun	30	61	18.8	13.8	755.0	65.8	24.8	1358.9		1345.5		1512.6	1356.1	1300.7	1345	1525	1335	1306	1144	1286
1-Jul	1	62	17.9	12.9	767.9	64.2	23.2	1382.1		1370.6		1535.8	1384.1	1321.7	1373	1552	1361	1329	1169	1311
2-Jul	2	63	17.9	12.9	780.8	64.2	23.2	1405.4		1396.1		1560.3	1406.8	1345.2	1404	1579	1385	1353	1193	1339
3-Jul	3	64	19.5	14.5	795.3	67.1	26.1	1431.5		1421.6		1583.9	1429.7	1367.6	1435	1604	1411	1377	1219	1367
4-Jul	4	65	21.7	16.7	811.9	71.0	30.0	1461.4		1445.7		1607.6	1452.5	1390.1	1462	1628	1438	1400	1242	1391
5-Jul	5	66	17.0	12.0	823.9	62.6	21.6	1483.0		1470.0		1633.2	1476.0	1415.2	1487	1652	1464	1424	1266	1412
6-Jul	6	67	15.1	10.1	834.0	59.1	18.1	1501.1		1493.9		1659.3	1497.1	1440.3	1513	1676	1487	1448	1291	1434
7-Jul	7	68	14.9	9.9	843.9	58.8	17.8	1518.9		1516.9		1681.0	1518.3	1463.0	1537	1698	1512	1471	1314	1458
8-Jul	8	69	21.5	16.5	860.4	70.7	29.7	1548.6		1539.7		1700.5	1540.4	1484.7	1561	1719	1536	1495	1338	1482
9-Jul	9	70	20.1	15.1	875.4	68.1	27.1	1575.7		1562.5		1721.0	1563.3	1505.3	1586	1739	1562	1519	1360	1506
10-Jul	10	71	20.6	15.6	891.0	69.1	28.1	1603.8		1586.0		1742.9	1587.2	1528.1	1609	1760	1590	1542	1382	1532
11-Jul	11	72	19.4	14.4	905.4	66.9	25.9	1629.7		1609.6		1763.7	1612.2	1551.3	1632	1780	1619	1566	1405	1558
12-Jul	12	73	18.1	13.1	918.5	64.6	23.6	1653.3		1633.3		1785.1	1639.4	1573.9	1654	1801	1646	1590	1429	1583
13-Jul	13	74	18.4	13.4	931.9	65.1	24.1	1677.4		1657.2		1806.1	1665.7	1598.3	1676	1823	1672	1613	1453	1607
14-Jul	14	75	18.9	13.9	945.8	66.0	25.0	1702.5		1680.8		1828.2	1689.7	1623.9	1699	1846	1698	1637	1476	1631
15-Jul	15	76	18.3	13.3	959.1	64.9	23.9	1726.4		1704.3		1851.0	1712.5	1647.5	1722	1869	1722	1660	1499	1655
16-Jul	16	77	17.9	12.9	972.0	64.1	23.1	1749.5		1728.4		1874.5	1734.4	1671.3	1746	1895	1747	1684	1525	1679
17-Jul	17	78	19.1	14.1	986.0	66.3	25.3	1774.8		1752.3		1898.1	1757.3	1694.5	1770	1921	1773	1708	1548	1702
18-Jul	18	79	20.0	15.0	1001.0	68.0	27.0	1801.8		1775.8		1920.2	1780.7	1716.5	1793	1945	1799	1731	1570	1727
19-Jul	19	80	19.3	14.3	1015.3	66.7	25.7	1827.5		1799.6		1942.3	1803.6	1738.3	1815	1969	1824	1755	1594	1754
20-Jul	20	81	18.6	13.6	1028.8	65.4	24.4	1851.9		1823.9		1964.8	1827.3	1762.2	1838	1994	1850	1779	1619	1782
21-Jul	21	82	18.1	13.1	1041.9	64.6	23.6	1875.5		1847.8		1987.8	1849.1	1788.0	1861	2018	1875	1802	1642	1807
22-Jul	22	83	18.4	13.4	1055.3	65.0	24.0	1899.5		1871.2		2010.1	1869.9	1812.6	1885	2042	1900	1826	1664	1831
23-Jul	23	84	18.6	13.6	1068.8	65.4	24.4	1923.9		1894.6		2032.2	1892.2	1836.0	1910	2064	1926	1850	1686	1855
24-Jul	24	85	19.2	14.2	1083.0	66.6	25.6	1949.5		1917.4		2053.5	1914.9	1857.1	1936	2087	1950	1873	1708	1877
25-Jul	25	86	20.0	15.0	1098.0	67.9	26.9	1976.4		1940.0		2075.5	1937.9	1877.6	1960	2109	1972	1897	1729	1901
26-Jul	26	87	19.0	14.0	1111.9	66.1	25.1	2001.5		1962.4		2097.1	1959.5	1898.5	1984	2132	1994	1921	1752	1924
27-Jul	27	88	18.2	13.2	1125.1	64.8	23.8	2025.2		1984.6		2119.2	1980.8	1919.9	2006	2153	2016	1944	1775	1947
28-Jul	28	89	18.0	13.0	1138.1	64.4	23.4	2048.6		2006.3		2140.5	2001.9	1941.5	2029	2174	2037	1968	1797	1969
29-Jul	29	90	13.5	8.5	1146.6	56.3	15.3	2063.9		2027.9		2162.4	2021.1	1963.0	2051	2195	2058	1992	1818	1991
30-Jul	30	91	13.4	8.4	1155.0	56.0	15.0	2079.0		2048.9		2184.0	2039.6	1984.2	2074	2217	2080	2015	1833	2012
31-Jul	31	92	13.4	8.4	1163.3	56.0	15.0	2094.0		2070.6		2206.4	2056.9	2006.3	2097	2240	2102	2039	1854	2035
1-Aug	1	93	13.7	8.7	1172.0	56.7	15.7	2109.7		2092.6		2229.2	2073.9	2029.4	2120	2262	2124	2063	1874	2057
2-Aug	2	94	18.1	13.1	1185.1	64.6	23.6	2133.2		2114.3		2252.3	2092.1	2051.0	2144	2284	2146	2086	1893	2080
3-Aug	3	95	17.7	12.7	1197.8	63.8	22.8	2156.0		2136.0		2275.5	2110.6	2073.4	2168	2304	2169	2110	1913	2100
4-Aug	4	96	17.0	12.0	1209.7	62.5	21.5	2177.5		2157.8		2298.3	2129.9	2095.8	2191	2325	2191	2134	1934	2122
5-Aug	5	97	16.3	11.3	1221.0	61.3	20.3	2197.8		2179.7		2321.2	2149.5	2118.1	2215	2346	2212	2157	1954	2144
6-Aug	6	98	16.4	11.4	1232.4	61.5	20.5	2218.3		2202.1		2344.2	2169.7	2140.5	2240	2368	2232	2181	1977	2166
7-Aug	7	99	17.1	12.1	1244.4	62.7	21.7	2240.0		2223.8		2365.8	2189.4	2163.9	2263	2388	2253	2205	1999	2187
8-Aug	8	100	16.6	11.6	1256.0	61.9	20.9	2260.8		2244.8		2386.4	2207.4	2186.6	2285	2409	2275	2228	2019	2208
9-Aug	9	101	16.6	11.6	1267.6	61.9	20.9	2281.7		2266.0		2405.6	2225.0	2209.7	2308	2431	2295	2252	2040	2228
10-Aug	10	102	16.6	11.6	1279.2	61.9	20.9	2302.5		2287.4		2425.2	2243.9	2231.8	2332	2454	2316	2275	2060	2249
11-Aug	11	103	16.6	11.6	1290.8	61.9	20.9	2323.4		2309.0		2445.2	2263.0	2253.7	2354	2477	2338	2299	2081	2270
12-Aug	12	104	16.6	11.6	1302.4	61.9	20.9	2344.3		2330.5		2465.2	2283.2	2276.1	2377	2499	2358	2323	2101	2292
13-Aug	13	105	16.6	11.6	1313.9	61.9	20.9	2365.1		2351.5		2484.8	2302.8	2296.9	2400	2521	2378	2346	2120	2313
14-Aug	14	106	16.6	11.6	1325.5	61.9	20.9	2386.0		2372.5		2503.9	2321.8	2316.6	2423	2544	2398	2370	2142	2334
15-Aug	15	107	16.6	11.6	1337.1	61.9	20.9	2406.8		2393.2		2522.6	2340.2	2335.7	2446	2566	2417	2394	2164	2354
16-Aug	16	108	16.6	11.6	1348.7	61.9	20.9	2427.7		2413.7		2541.5	2358.4	2352.8	2470	2588	2437	2417	2184	2374
17-Aug	17	109	16.6	11.6	1360.3	61.9	20.9	2448.5		2434.4		2560.2	2377.2	2369.3	2495	2611	2456	2441	2205	2395
18-Aug	18	110	16.6	11.6	1371.9	61.9	20.9	2469.4		2454.6		2578.2	2394.1	2387.0	2518	2634	2475	2465	2225	2416
19-Aug	19	111	16.6	11.6	1383.5	61.9	20.9	2490.2		2475.9		2597.5	2412.5	2408.1	2541	2656	2494	2488	2246	2439
20-Aug	20	112	16.6	11.6	1395.0	61.9	20.9	2511.1		2497.9		2617.7	2434.3	2431.5	2566	2678	2513	2512	2267	2462
21-Aug	21	113	16.6	11.6	1406.6	61.9	20.9	2531.9		2520.4		2636.6	2456.4	2454.3	2592	2701	2533	2536	2291	2483
22-Aug	22	114	16.6	11.6	1418.2	61.9	20.9	2552.8		2543.0		2656.0	2480.4	2476.2	2617	2725	2554	2559	2315	2504
23-Aug	23	115	16.6	11.6	1429.8	61.9	20.9	2573.6		2565.5		2676.9	2504.8	2499.9	2642	2748	2573	2583	2338	2524
24-Aug	24	116	16.6	11.6	1441.4	61.9	20.9	2594.5		2587.3		2696.5	2525.0	2524.6	2667	2773	2591	2607	2358	2544
25-Aug	25	117	16.6	11.6	1453.0	61.9	20.9	2615.4		2609.0		2716.3	2543.9	2547.3	2690	2796	2611	2630	2381	2565
26-Aug	26	118	16.6	11.6	1464.6	61.9	20.9	2636.2		2630.2		2735.7	2564.5	2567.4	2714	2818	2631	2654	2404	2583
27-Aug	27	119	16.6	11.6	1476.1	61.9	20.9	2657.1		2651.6		2755.9	2586.2	2590.2	2739	2839	2648	2678	2426	2601
28-Aug	28	120	16.6	11.6	1487.7	61.9	20.9	2677.9		2673.3		2775.2	2608.2	2610.5	2763	2861	2667	2701	2451	2622
29-Aug	29	121	16.6	11.6	1499.3	61.9	20.9	2698.8				2794.6	2631.2		2787	2882	2688	2725	2472	2644
30-Aug	30	122	16.6	11.6	1510.9	61.9	20.9	2719.6				2814.0	2653.8		2811	2905	2710	2749	2491	2664
31-Aug	31	123	16.6	11.6	1522.5	61.9	20.9	2740.5				2833.3	2675.0		2837	2930	2730	2772	2512	2682
1-Sep	1	124	0.0	-5.0	1517.5	32.0	-9.0	2731.5				2851.5	2694.4		2862	2955	2750	2796	2532	2702
2-Sep	2	125	0.0	-5.0	1512.5	32.0	-9.0	2722.5					2714.2		2887	2979	2769	2819	2556	2722
3-Sep	3	126	0.0	-5.0	1507.5	32.0	-9.0	2713.5					2736.8		2914	3004	2787	2843	2582	2745
4-Sep	4	127	17.7	-5.0	1502.5	63.8	22.8	2736.3					2758.3		2905	3029	2805	2867	2605	2767
5-Sep	5	128	17.7	-5.0	1497.5	63.8	22.8	2759.2					2779.4		2896	3053	2824	2890	2628	2788