Volume:
Issue:
Date:
2
3
July 16, 2010
Potato Bytes
Klamath Basin Research and Extension Center
6941 Washburn Way
Klamath Falls, Oregon 97603
(tel)541-883-4590
4590 (fax) 541
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
Brian’s Notes
Water Use in/day
Potato Crop Water Use
Average (1999-2009)
2009)
0.30
0.20
1
2
3
4
5
0.10
Total P-Day
Day Accumulation
Estimated Emergence - July 15
0.00
400.0
Date
p-days
300.0
KBREC
Actual Water Use:
Planting Date:
Last 3 days:
Last 7 days:
Last 14 days:
Estimated Water
Use:
Next 7 days:
Inches
Early
0.88
1.97
3.58
Late
0.63
1.36
2.30
2.03
1.47
Water Use in/day
Potato Crop Water Use 2010
0.35
0.30
0.25
0.20
0.15
0.10
0.05
0.00
Early
Late
6/1
6/8
6/15 6/22 6/29
Time
7/6
7/13
'May 15
200.0
'June 1
'June 15
100.0
0.0
2005 2006 2007 2008 2009
Volume:
Issue:
Date:
2
3
July 16, 2010
Potato Bytes
Klamath Basin Research and Extension Center
6941 Washburn Way
Klamath Falls, Oregon 97603
(tel)541-883-4590
4590 (fax) 541
541-883-4596
http://oregonstate.edu/dept/kbrec
Brian A. Charlton, Research and Extension Agent -541-591-1255
Insect Trap Report
July 7 - July 15
Klamath County
TRAP
1
2
3
4
5
6
7
8
9
LOCATION
Anderson Rd
Township Rd
Transformer - Drazil Rd
Harpold - Pickett Rd
Schaupp Rd
Burgdorf - Casbeer Rd
Wu Rd
Homedale Rd - South
Springlake Rd
PTW
NA
NA
NA
NA
NA
NA
NA
NA
NA
BLH
0
0
0
1
0
0
0
1
0
ALH
11
19
27
5
2
8
9
8
10
PSY
0
0
0
0
0
0
0
0
0
NA
NA
NA
NA
NA
NA
0
0
1
0
2
1
9
5
7
8
4
1
0
0
0
0
0
0
PTW: Potato Tuberworm
BLH: Beet Leafhoppers
ALH: Aster Leafhoppers
PSY: Psyllid
Modoc and Siskiyou
1
2
3
4
5
6
TID 5010
Frog Pond
TID 4385
TID 4260
TID 4324
TID 4232
Aphid Traps
1
2
3
4
5
6
7
Running Y
Lower Lake - West
Lower Lake - East
Malin - North West
Malin - East
South Poe Valley
Bonanza - East
Potato GPA
Other
10
29
4
0
1
6
3
18
28
5
4
19
9
13
0
0
0
0
0
0
0
GPA: Green Peach Aphid
Volume:
Issue:
Date:
2
3
July 16, 2010
Potato Bytes
Klamath Basin Research and Extension Center
6941 Washburn Way
Klamath Falls, Oregon 97603
(tel)541-883-4590
4590 (fax) 541
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 2010
For Root-knot nematode control, Vydate applications should begin at 800 degree
degree-days
days (DD5C).
To estimate that date, add the number of Total degree
degree-days
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
root nematode control, Vydate applications should begin at 0 degree
degree-days
days (at planting)
and followed by an application at the first full irrigation following emergence. An additional
application is recommended at 800 degree
degree-days (DD5C).
KBREC DD5C IREC DD5C
Date
4/15/10
4/16/10
4/17/10
4/18/10
4/19/10
4/20/10
4/21/10
4/22/10
4/23/10
4/24/10
4/25/10
4/26/10
4/27/10
4/28/10
4/29/10
4/30/10
5/1/10
5/2/10
5/3/10
5/4/10
5/5/10
5/6/10
5/7/10
5/8/10
5/9/10
5/10/10
Daily
2.8
3.6
4.0
4.7
4.8
4.2
2.4
1.8
4.1
4.3
4.5
4.3
3.6
2.6
2.1
2.0
4.2
4.5
4.8
4.1
4.5
4.0
5.0
6.0
6.1
5.5
Total
0.0
3.6
7.6
12.3
17.1
21.4
23.7
25.5
29.7
34.0
38.4
42.8
46.3
48.9
51.0
53.0
57.2
61.7
66.5
70.6
75.1
79.1
84.2
90.2
96.3
101.8
Daily
2.8
3.5
4.1
4.8
4.8
4.5
3.1
2.7
3.9
4.6
4.6
4.7
4.2
3.5
3.1
3.4
4.4
4.7
5.4
5.2
5.2
4.7
5.1
6.4
7.0
6.6
Total
0.0
3.5
7.6
12.4
17.2
21.6
24.7
27.4
31.3
35.9
40.6
45.3
49.5
53.0
56.1
59.5
63.9
68.7
74.1
79.3
84.6
89.3
94.3
100.7
107.7
114.3
KBREC DD5C
Date
5/11/10
5/12/10
5/13/10
5/14/10
5/15/10
5/16/10
5/17/10
5/18/10
5/19/10
5/20/10
5/21/10
5/22/10
5/23/10
5/24/10
5/25/10
5/26/10
5/27/10
5/28/10
5/29/10
5/30/10
5/31/10
6/1/10
6/2/10
6/3/10
6/4/10
6/5/10
Daily
4.7
5.5
7.0
7.8
8.3
8.3
10.2
7.1
7.1
6.4
6.4
5.5
5.5
5.9
5.4
5.3
5.6
6.4
7.1
7.8
8.7
12.3
11.7
10.2
12.6
12.0
Total
106.6
112.1
119.1
126.8
135.1
143.4
153.6
160.7
167.9
174.3
180.7
186.2
191.7
197.6
203.0
208.3
213.9
220.3
227.4
235.2
243.9
256.2
267.9
278.0
290.6
302.6
IREC DD5C
Daily
5.4
6.1
7.7
8.9
9.7
10.2
10.6
10.3
10.2
9.2
8.5
7.3
7.0
7.4
7.2
6.9
6.9
7.3
7.7
8.6
9.7
10.3
10.4
9.7
10.0
10.5
Total
119.7
125.8
133.5
142.4
152.1
162.3
172.9
183.2
193.4
202.6
211.0
218.4
225.4
232.8
239.9
246.8
253.7
261.0
268.7
277.3
287.0
297.3
307.7
317.5
327.4
337.9
KBREC DD5C
Date
6/6/10
6/7/10
6/8/10
6/9/10
6/10/10
6/11/10
6/12/10
6/13/10
6/14/10
6/15/10
6/16/10
6/17/10
6/18/10
6/19/10
6/20/10
6/21/10
6/22/10
6/23/10
6/24/10
6/25/10
6/26/10
6/27/10
6/28/10
6/29/10
6/30/10
Daily
14.0
12.6
13.8
11.5
9.7
9.8
11.2
13.2
15.2
13.3
10.4
10.3
12.1
11.0
10.7
12.6
14.6
16.6
17.6
17.0
16.8
17.8
18.8
16.6
16.0
Total
316.6
329.2
343.0
354.5
364.2
374.0
385.2
398.4
413.6
426.9
437.3
447.6
459.7
470.6
481.3
493.9
508.5
525.1
542.7
559.7
576.4
594.2
613.0
629.6
645.6
IREC DD5C
Daily
11.8
12.6
13.2
13.4
12.6
11.7
12.1
13.0
14.2
14.2
12.7
12.5
13.1
13.6
13.4
13.9
15.3
16.1
17.0
17.2
17.0
17.3
18.0
18.6
17.3
Total
349.7
362.3
375.5
388.9
401.6
413.3
425.5
438.4
452.6
466.8
479.5
492.0
505.1
518.8
532.1
546.0
561.3
577.4
594.4
611.6
628.6
645.9
663.9
682.6
699.9
Volume:
Issue:
Date:
2
3
July 16, 2010
Potato Bytes
Klamath Basin Research and Extension Center
6941 Washburn Way
Klamath Falls, Oregon 97603
(tel)541-883-4590
4590 (fax) 541
541-883-4596
http://oregonstate.edu/dept/kbrec
Brian A. Charlton, Research and Extension Agent -541-591-1255
Date
7/1/10
7/2/10
7/3/10
7/4/10
7/5/10
7/6/10
7/7/10
7/8/10
7/9/10
7/10/10
7/11/10
7/12/10
7/13/10
7/14/10
7/15/10
7/16/10
Daily
16.5
17.0
15.1
15.8
16.5
17.3
17.8
15.6
15.7
16.4
17.6
18.0
16.7
10.9
14.2
Total
662.1
679.1
694.2
710.0
726.5
743.8
761.6
777.2
792.9
809.3
826.9
845.0
861.7
872.6
886.9
Daily
16.6
15.7
14.6
15.1
15.8
16.4
17.5
17.9
18.0
18.7
19.3
19.5
19.4
19.1
19.8
Total Date
716.5
732.2
746.8
761.9
777.7
794.1
811.6
829.5
847.5
866.2
885.5
905.0
924.4
943.5
963.3
Daily Total
Daily Total
Date
Daily Total
Daily Total
Volume:
Issue:
Date:
2
3
July 16, 2010
Potato Bytes
Klamath Basin Research and Extension Center
6941 Washburn Way
Klamath Falls, Oregon 97603
(tel)541-883-4590
4590 (fax) 541
541-883-4596
http://oregonstate.edu/dept/kbrec
Brian A. Charlton, Research and Extension Agent -541-591-1255
Brian’s Notes
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
ca
drying
during the day.
Insect Trap Reports:: Aphid numbers are on the rise as hay fields have been recently cut. As expected
expected,, thresholds for seed production are
hard to determine. Control measures may be warranted.
Flea Beetles: As most of you are aware, Tuber Flea Beetle and/or Western Potato Flea Beetle have become resident pests in the Henley
area the past several years. Problem fields were noted in the Malin area last year for the first time. Potatoes that received a systemic
insecticide should have ample protection during the early portion of the growing season. However, thorough scouting is needed
neede to verify if
additional
ional foliar sprays are warranted. Treatment thresholds are very low (1 beetle per 60 plants). Scout field edges first, if counts exceed
this threshold move further into the field and repeat. Doing so will determine if aerial applications are warranted for the entire field or can
be targeted to field edges only. REMEMBER – shot hole damage on lambsquater weed is not a good indicator that an aerial application is
warranted. Tuber / Western Potato Flea Beetles prefer to feed on potatoes and are rarely ob
observed on non--Solanaceous weeds. Damage to
lambsquarter is most likely the result of Crucifer Flea Beetle which poses no risk to potatoes. Feel free to call me for a field
f
visit if needed.
Soil Degree-Day Accumulation:: Initial values recorded at OSU
OSU-KBREC
KBREC were much cooler than previous years as the crop canopy around
the AgriMet was not mowed and irrigated this spring. After thoroughly analyzing GDD values for the past 5 years and closely correlating
these to values at UC-IREC
IREC I made some slight adj
adjustments.
ustments. I’m relatively confident the values presented to date are very close to what we
would have actually expected. Values are about a week behind last year. The 800 DD target is a few days away for folks who planted
around the 1st of May and about a week away for potatoes planted around mid
mid-May.
May. 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
days are a measure of potato physiological growth from the time of emergence. Depending
on emergence dates, growth this year is considerably behind last year but very similar to 2005 and 2008. Central Oregon research
rese
and
extension specialists have noted a strong correlation with 300 pdays and the onset of Early Blight. Early
arly emerged potatoes should reach
this target in the next few days while potatoes emerging in early June should reach this target in the next 7-10
7
days. A preventative
fungicide might be warranted if you routinely experience problems with this disease.
Other: The Columbia Basin has recently confirmed the presence of late blight in at least 4 fields as of 6/30. Two of these fields had
h been
on a 10-14
14 application schedule of fungicides which clearly did not provide adequate protection against infection. Potato Specialists have
been recommending a 7 day schedule using manzate and chlorothalonil products. We’ve been fortunate this disease has not been a real
problem in the Klamath Basin; however, several fields in the late ‘90s saw the devastating results of this pathogen. As such, this disease is
always a threat and preventative methods continue to be necessary to disrupt the disease triangle. Be cognizant of your irrigation
irri
schedule
to prevent periods of excessive moisture in the lower canopy. Night iirrigations
rrigations not only take advantage of reduced wind which improves
distribution uniformity but allows for better canopy drying during the day. Continue to aggressively scout fields in wet areas
are for infection
and bring suspect samples for confirmation and take
ake of any cull piles!
Potato Bytes published by: Brian A. Charlton, Research and Extension Agent 541-591
591-1255
Darrrin Culp, Fac. Res. Asst 541-891-0784