Volume: 1
Issue:
6
Date:
August 7, 2009
Potato Bytes
Klamath Basin Research and Extension Center
6941 Washburn Way
Klamath Falls, Oregon 97603
(tel) 541-883-4590 (fax) 541-883-4596
http://oregonstate.edu/dept/kbrec
Brian A. Charlton, Research and Extension Agent –541-591-1255
Inside this issue:
Crop Water Use
Insect Trap Report
Soil Degree Data
Soil Degree Data
Inside Story
0.35
0.30
0.25
0.20
0.15
0.10
0.05
0.00
Early
8/5
7/29
7/22
7/15
7/8
7/1
6/24
6/17
6/10
6/3
5/27
Late
5/20
Water Use in/day
Potato Crop Water Use 2009
Time
KBREC
Actual Water Use:
Planting Date:
Last 3 days:
Last 7 days:
Last 14 days:
Estimated Water Use:
Next 7 days:
Inches
Early
0.66
1.60
3.58
Late
0.66
1.60
3.51
1.54
1.54
1
2
3
4
5
Volume: 1
Issue:
6
Date:
August 7, 2009
Potato Bytes
Klamath Basin Research and Extension Center
6941 Washburn Way
Klamath Falls, Oregon 97603
(tel) 541-883-4590 (fax) 541-883-4596
http://oregonstate.edu/dept/kbrec
Brian A. Charlton, Research and Extension Agent –541-591-1255
Insect Trap Report
July 29 - August 5
Klamath County
TRAP
1
2
3
4
5
6
7
8
9
10
LOCATION
Bergdorf Rd
Hwy 39
Tingley Lane
Township Rd
Malin Rd
Suty Rd
Harpold Rd
Anderson Rd
L. Klamath Lake
Near Dairy
PTW
0
0
0
0
0
0
0
0
0
0
BLH
2
0
0
0
1
1
0
4
8
4
OLH
163
121
106
310
59
175
69
96
> 600
216
PSY
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
4
10
2
1
1
1
16
0
2
3
113
277
148
65
114
3
183
149
59
69
0
0
0
0
0
0
0
0
0
0
Potato
5
14
6
15
10
9
NA
GPA
2
2
0
0
2
3
NA
PTW: Potato Tuberworm
BLH: Beet Leafhoppers
OLH: Other Leafhoppers
PSY: Psyllid
Modoc and Siskiyou
1
2
3
4
5
6
7
8
9
10
TID# 5038
IREC
TID# 4445/4533
TID# 4438
TID#4332
TID# 4421
TID# 362-36
TID# 4358
TID# 4125
TID# 4138
Aphid Traps
1
2
3
4
5
6
7
Running Y
Bedfield Road
West Malin
East Malin
Lower Lake
Buesing Road
Yonna Valley
Other
8
GPA: Green Peach Aphid
18
0
19
13
37
NA
Volume: 1
Issue:
6
Date:
August 7, 2009
Potato Bytes
Klamath Basin Research and Extension Center
6941 Washburn Way
Klamath Falls, Oregon 97603
(tel) 541-883-4590 (fax) 541-883-4596
http://oregonstate.edu/dept/kbrec
Brian A. Charlton, Research and Extension Agent –541-591-1255
Soil Degree-Day Accumulation -- KBREC and IREC 2009
For Root-knot nematode control, Vydate applications should begin at 800 degree-days (DD5C).
To estimate that date, add the number of Total degree-days "Total" on the day you planted
to 800. Where that value occurs in the "Total" column estimates the date on which 800 DD5C
will occur in that field. It is recommended that applications continue every 14 days until harvest.
For Stubby-root nematode control, Vydate applications should begin at 0 degree-days (at planting)
and followed by an application at the first full irrigation following emergence. An additional
application is recommended at 800 degree-days (DD5C).
Date
4/15/09
4/16/09
4/17/09
4/18/09
4/19/09
4/20/09
4/21/09
4/22/09
4/23/09
4/24/09
4/25/09
4/26/09
4/27/09
4/28/09
4/29/09
4/30/09
5/1/09
5/2/09
5/3/09
5/4/09
5/5/09
5/6/09
5/7/09
5/8/09
5/9/09
5/10/09
KBREC DD5C
Daily Total
0.5 0.5
0.9 1.4
1.7 3.1
2.7 5.8
4.1 10.0
5.3 15.3
6.2 21.5
6.6 28.1
6.3 34.4
5.4 39.8
4.9 44.7
4.7 49.4
4.8 54.1
4.5 58.6
4.4 63.0
4.7 67.8
5.0 72.8
4.1 76.9
4.2 81.1
3.6 84.7
3.9 88.6
4.9 93.5
5.5 99.0
5.8 104.8
6.5 111.3
7.0 118.3
IREC DD5C
Daily Total Date
0.0 0.0
5/11/09
0.0 0.0
5/12/09
0.4 0.4
5/13/09
1.3 1.8
5/14/09
2.2 4.0
5/15/09
3.2 7.2
5/16/09
4.1 11.3 5/17/09
4.7 16.0 5/18/09
4.6 20.7 5/19/09
3.9 24.6 5/20/09
3.2 27.7 5/21/09
3.1 30.8 5/22/09
2.8 33.6 5/23/09
2.5 36.1 5/24/09
2.6 38.7 5/25/09
3.2 41.9 5/26/09
3.9 45.8 5/27/09
3.7 49.5 5/28/09
3.8 53.3 5/29/09
3.8 57.1 5/30/09
4.1 61.2 5/31/09
5.0 66.2 6/1/09
5.1 71.3 6/2/09
5.0 76.3 6/3/09
5.4 81.7 6/4/09
6.0 87.6 6/5/09
KBREC DD5C
Daily Total
7.5
125.8
7.4
133.2
6.5
139.7
6.6
146.4
7.0
153.4
8.5
161.9
9.7
171.6
10.6 182.3
10.7 193.0
10.0 202.9
9.8
212.7
10.5 223.2
11.3 234.5
11.6 246.1
11.5 257.7
11.7 269.4
12.0 281.4
12.6 294.0
12.7 306.8
12.8 319.5
12.5 332.0
12.1 344.1
11.9 356.0
10.8 366.8
10.5 377.3
9.5
386.9
IREC DD5C
Daily Total
6.5 94.2
6.3 100.4
6.0 106.4
6.6 113.0
6.9 119.9
7.9 127.8
8.9 136.7
10.5 147.2
11.0 158.2
10.0 168.2
10.0 178.1
10.4 188.5
10.9 199.4
11.2 210.7
11.6 222.3
12.0 234.3
12.2 246.5
13.0 259.5
13.6 273.1
14.1 287.2
13.8 301.0
13.3 314.3
13.9 328.2
13.4 341.6
13.1 354.8
11.8 366.6
Date
6/6/09
6/7/09
6/8/09
6/9/09
6/10/09
6/11/09
6/12/09
6/13/09
6/14/09
6/15/09
6/16/09
6/17/09
6/18/09
6/19/09
6/20/09
6/21/09
6/22/09
6/23/09
6/24/09
6/25/09
6/26/09
6/27/09
6/28/09
6/29/09
6/30/09
7/1/09
KBREC DD5C
Daily Total
9.6 396.5
10.5 407.0
10.8 417.8
10.5 428.3
10.1 438.4
9.9 448.3
9.8 458.1
10.3 468.4
10.6 479.0
11.0 490.0
11.0 501.0
11.9 512.9
11.7 524.6
12.0 536.6
11.6 548.1
10.9 559.1
10.7 569.7
11.7 581.4
12.5 593.9
13.0 606.9
13.2 620.1
13.5 633.6
14.0 647.6
14.2 661.8
14.2 676.1
14.4 690.4
IREC DD5C
Daily Total
11.7 378.3
12.7 391.0
12.7 403.7
12.5 416.2
12.2 428.4
12.0 440.4
12.0 452.4
12.1 464.5
12.8 477.4
13.5 490.8
13.5 504.3
15.0 519.4
15.3 534.6
14.9 549.6
14.3 563.9
13.7 577.6
13.1 590.7
14.0 604.7
15.2 619.9
15.7 635.5
15.7 651.3
15.3 666.5
15.7 682.3
16.5 698.8
17.0 715.7
17.1 732.8
Volume: 1
Issue:
6
Date:
August 7, 2009
Potato Bytes
Klamath Basin Research and Extension Center
6941 Washburn Way
Klamath Falls, Oregon 97603
(tel) 541-883-4590 (fax) 541-883-4596
http://oregonstate.edu/dept/kbrec
Brian A. Charlton, Research and Extension Agent –541-591-1255
Soil Degree-Day Accumulation -- KBREC and IREC 2009
(Con’t)
Date
KBREC DD5C IREC DD5C
KBREC DD5C IREC DD5C
KBREC DD5C
IREC DD5C
Daily Total Daily Total Date Daily Total Daily Total Date Daily Total
Daily Total
7/2/09
7/3/09
14.0
14.3
704.4
718.7
17.2
17.3
750.0
767.4
7/4/09
7/5/09
7/6/09
7/7/09
7/8/09
7/9/09
7/10/09
7/11/09
7/12/09
7/13/09
7/14/09
7/15/09
7/16/09
7/17/09
7/18/09
7/19/09
7/20/09
7/21/09
7/22/09
7/23/09
7/24/09
7/25/09
7/26/09
7/27/09
7/28/09
7/29/09
7/30/09
7/31/09
14.7
14.7
14.2
13.8
13.5
13.7
14.0
14.1
14.2
14.0
14.0
14.9
17.2
17.5
18.2
18.0
18.1
18.4
18.8
18.9
19.0
19.2
19.3
19.5
19.8
20.0
19.9
19.8
733.4
748.1
762.3
776.1
789.6
803.3
817.2
831.3
845.5
859.5
873.5
888.3
905.6
923.0
941.2
959.2
977.3
995.7
1014.5
1033.4
1052.4
1071.6
1091.0
1110.5
1130.3
1150.3
1170.2
1190.0
17.7
17.0
16.2
15.5
15.0
15.1
15.4
15.0
14.5
14.8
15.8
16.4
17.3
17.6
17.8
17.7
18.0
18.5
18.9
19.0
18.8
18.1
18.7
19.0
20.4
21.1
20.8
20.5
785.0
802.0
818.2
833.7
848.7
863.8
879.2
894.2
908.7
923.5
939.4
955.8
973.1
990.7
1008.5
1026.3
1044.2
1062.7
1081.6
1100.6
1119.4
1137.5
1156.3
1175.3
1195.6
1216.7
1237.5
1258.4
8/1/09
8/2/09
8/3/09
8/4/09
8/5/09
8/6/09
19.5
18.8
18.0
18.1
17.3
16.3
1209.5
1228.3
1246.2
1264.4
1281.7
1297.9
20.1
19.8
19.2
19.0
17.8
16.3
1278.2
1297.9
1317.2
1336.2
1353.9
1370.2
Volume: 1
Issue:
6
Date:
August 7, 2009
Potato Bytes
Klamath Basin Research and Extension Center
6941 Washburn Way
Klamath Falls, Oregon 97603
(tel) 541-883-4590 (fax) 541-883-4596
http://oregonstate.edu/dept/kbrec
Brian A. Charlton, Research and Extension Agent –541-591-1255
Brian’s Notes
Total P-Day Accumulation
Estimated Emergence - August 6
Crop Water Use: I’m certain most of us are thankful for the
drop in temperature as we’ve had quite a run of hot weather
the past couple of weeks. Crop water use will be lower this
coming week as temperatures cool and crop maturity advances. Pay close attention to soil moisture to prevent lenticel
rupture which can increase the likelihood of developing pink
rot in problematic areas.
500.0
400.0
p-days
Insect Trap Reports: Insect pressure has remained relatively
low throughout the growing season. We have not detected
potato tuber moth or psyllids so far this season. Beet leafhopper numbers are higher this week than we’ve noticed throughout the season. Look for aphid numbers to increase during
August as small grains continue to mature and harvest nears.
600.0
'May 15
300.0
'June 1
'June 15
200.0
100.0
0.0
2004
Soil Degree-Day Accumulation: Values are comparable to
previous years. The 800 DD target will occur shortly for potatoes planted after June 1. Please read the recommendations
on the top of page 2 if you plan on using Vydate for nematode
control/suppression.
2005
2006
2007
2008
2009
Klamath Falls Historical P-day Accumulation
(May 1 - September 15)
840
P-day Accumulation: P-days are a measure of potato
physiological growth from the time of emergence. Data is
provided to show how this growing season compares with
prior years.
Other: Late blight was recently found in the Columbia Basin
and the Northeast states have been struggling to keep ahead of
this pathogen. Considering the cooler air temperatures, rainfall, and overcast skies, it might be wise to apply a preventative fungicide soon. Lush canopy growth and long irrigation
sets without adequate time for canopy drying create an ideal
environment for late blight development. Fungicide applications to help reduce the incidence of pink rot are also recommended in fields with a problematic history.
820
800
s780
y
a
d
P
760
P-days
740
720
700
Year
Potato Bytes published by: Brian A. Charlton, Research and Extension Agent 541-591-1255
Darrin Culp, Fac. Res. Asst 541-891-0784