Volume: 1
Issue:
4
Date:
July 24, 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
7/22
Time
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
KBREC
Actual Water Use:
Planting Date:
Last 3 days:
Last 7 days:
Last 14 days:
Estimated Water Use:
Next 7 days:
Inches
Early
Late
0.81
1.94
3.66
0.75
1.78
3.25
1.89
1.75
1
2
3
4
5
Volume: 1
Issue:
4
Date:
July 24, 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 15 - July 22
Klamath County
TRAP
LOCATION
1
Bergdorf Rd
2
Hwy 39
3
Tingley Lane
4
Township Rd
5
Malin Rd
6
Suty Rd
7
Harpold Rd
8
Anderson Rd
9
L. Klamath Lake
10
Near Dairy
PTW
0
0
0
0
0
0
0
0
0
0
BLH
0
2
3
2
2
0
1
3
2
4
OLH
23
26
22
116
8
22
6
11
61
211
PSY
0
0
0
0
0
0
0
0
0
0
Modoc and Siskiyou
1
TID# 5038
2
IREC
3
TID# 4445/4533
4
TID# 4438
5
TID#4332
6
TID# 4421
7
TID# 362-36
8
TID# 4358
9
TID# 4125
10
TID# 4138
0
0
0
0
0
0
0
0
0
0
6
10
9
5
2
1
2
0
0
0
55
76
117
72
42
17
73
97
36
4
0
0
0
0
0
0
0
0
0
0
Potato
15
6
1
5
8
10
7
GPA
1
0
0
1
0
1
0
Aphid Traps
1
Running Y
2
Bedfield Road
3
West Malin
4
East Malin
5
Lower Lake
6
Buesing Road
7
Yonna Valley
PTW: Potato Tuberworm
BLH: Beet Leafhoppers
OLH: Other Leafhoppers
PSY: Psyllid
Other
30 GPA: Green Peach Aphid
7
1
35
4
19
7
Volume: 1
Issue:
4
Date:
July 24, 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:
4
Date:
July 24, 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
Daily
Total
IREC DD5C
Daily
Total
7/2/09
7/3/09
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
14.0
14.3
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
17.2
17.3
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
704.4
718.7
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
750.0
767.4
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
Volume: 1
Issue:
4
Date:
July 24, 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 - July 23
p-days
Crop Water Use: Hot weather has finally arrived with the
past nine days in the high ‘80s to low ‘90s. As expected,
water use has increased considerably. Physiological tuber
deformities (growth cracks, knobs) and internal hollow heart
and brown center can become more problematic during hot
weather if soil moisture is not managed correctly. Therefore,
pay close attention to crop water needs!! As I’ve mentioned
before, look to irrigate in the evening or at night to take advantage of reduced wind which will improve distribution
uniformity and facilitate better canopy drying during the day.
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 have fluctuated from week-to-week but
are still rather low in most trapping locations. Looks for
aphid numbers to increase during August as small grains
continue to mature and harvest nears.
Soil Degree-Day Accumulation: Values are comparable to
previous years. The 800 DD target will occur shortly for late
planted potatoes. Please read the recommendations on the top
of page 2 if you plan on using Vydate for nematode control/
suppression.
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.
450.0
400.0
350.0
300.0
250.0
200.0
150.0
100.0
50.0
0.0
'May 15
'June 1
'June 15
2004
2005
2006
2007
2008
2009
Klamath Falls Historical P-day Accumulation
(May 1 - September 15)
840
820
800
s780
y
a
d
P
760
P-days
740
720
Other: Late blight was recently found in the Columbia Basin. Despite the hot air temperatures and low relative humidity, we are not immune to this pathogen. Lush canopy growth
and long irrigation sets without adequate time for canopy drying create an ideal environment for late blight development.
Be sure to use preventive fungicides as needed to protect new
growth throughout the season. Fungicide applications to help
reduce the incidence of pink rot are also recommended in
fields with a problematic history.
700
Year
Potato Bytes published by: Brian A. Charlton, Research and Extension Agent 541-591-1255
Darrin Culp, Fac. Res. Asst 541-891-0784