Volume: 1
Issue:
2
Date:
July 15, 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
Potato Crop Water Use 2009
Water Use in/day
0.30
0.25
0.20
0.15
Early
0.10
Late
0.05
0.00
Time
KBREC
Actual Water Use:
Planting Date:
Last 3 days:
Last 7 days:
Last 14 days:
Estimated Water Use:
Next 7 days:
Inches
Early
Late
0.72
1.64
3.34
0.62
1.36
2.63
1.68
1.04
1
2
3
4
5
Volume: 1
Issue:
2
Date:
July 15, 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 1 - July 8
Klamath County
TRAP
1
2
3
4
5
6
LOCATION
Bergdorf Rd
Hwy 39
Tingley Lane
Township Rd
Malin Rd
Suty Rd
7
8
9
10
Harpold Rd
Anderson Rd
L. Klamath Lake
PTW
0
0
0
0
0
0
BLH
4
0
0
0
2
0
OLH
58
4
16
10
7
6
PSY
0
0
0
0
0
0
0
0
0
0
2
1
10
3
12
0
0
0
NA
NA
NA
NA
NA
0
0
0
0
0
NA
NA
NA
NA
NA
1
6
0
0
0
NA
NA
NA
NA
NA
2
13
1
13
0
NA
NA
NA
NA
NA
0
0
0
0
0
Potato
1
7
2
4
6
5
GPA
0
0
0
1
0
0
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
Running Y
Bedfield Road
West Malin
East Malin
Lower Lake
Buesing Road
Other
6
GPA: Green Peach Aphid
12
2
30
7
14
Volume: 1
Issue:
2
Date:
July 15, 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:
2
Date:
July 15, 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
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
KBREC DD5C
IREC DD5C
Daily
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
Daily
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
Total
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
Total
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
Volume: 1
Issue:
2
Date:
July 15, 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 14
Crop Water Use: Usage has definitely picked up with the
warmer weather and more advanced crop growth. When feasible, 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.
400.0
Insect Trap Reports: Overall insect pressure is relatively
low. Beet leafhoppers are being seen more frequently than
last year and are vectors of the purple top phytoplasma
(BLTVA). Aphid numbers in yellow pan traps are also relatively low; however, these numbers are likely to increase as
2nd cutting hay commences.
300.0
sy
a 200.0
d
p
'May 15
100.0
'June 15
'June 1
0.0
Soil Degree-Day Accumulation: Values are comparable to
previous years. The 800 DD target will occur shortly for early
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. Depending
on emergence dates, growth this year is slightly ahead of 2008
and very similar to 2007. Central Oregon research and extension specialists have noted a strong correlation with 300 pdays and the onset of Early Blight. Early emerged potatoes
have already surpassed this target so check fields closely to
see if symptoms are present. For later planted potatoes, a preventative fungicide might be warranted as the target is getting
close.
20 04 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: I’ve noticed quite a few cull piles throughout the Basin. Late Blight is always a threat and preventative methods
continue to be necessary to disrupt the disease triangle.
We’ve been fortunate this disease has not been a real problem;
however, several fields in the late ‘90s saw the devastating
results of this pathogen. In short, take care of your cull piles!!
700
Year
Potato Bytes published by: Brian A. Charlton, Research and Extension Agent 541-591-1255
Darrin Culp, Fac. Res. Asst 541-891-0784