Volume:
Issue:
Date:
2
2
July 8, 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
0.00
Total P-Day
Day Accumulation
Estimated Emergence - July 8
400.0
Date
p-days
300.0
Potato Crop Water Use 2010
100.0
0.30
Water Use in/day
15-May
1-Jun
15-Jun
200.0
0.0
0.25
04
0.20
0.15
Early
0.10
Late
0.05
0.00
6/1
6/8
6/15
6/22
6/29
7/6
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
0.76
1.61
2.90
0.46
0.94
1.68
1.61
0.91
05
06
07
08
09
10
Volume:
Issue:
Date:
2
2
July 8, 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 1 - July 7
Klamath County
TRAP LOCATION
1
Anderson Rd
2
Township Rd
3
Transformer - Drazil Rd
4
Harpold - Pickett Rd
5
Schaupp Rd
6
Burgdorf - Casbeer Rd
7
Wu Rd
8
Homedale Rd - South
9
Springlake Rd
PTW
0
0
0
0
0
0
0
0
0
BLH
0
0
0
0
0
0
3
0
0
OLH
2
4
3
2
5
2
2
3
13
PSY
0
0
0
0
0
0
0
0
0
Modoc and Siskiyou
1
TID 5010
2
Frog Pond
3
TID 4385
4
TID 4260
5
TID 4324
6
TID 4232
0
0
0
0
0
0
0
0
1
0
1
0
0
2
5
2
5
1
0
0
0
0
0
0
Aphid Traps
1
Running Y
2
Lower Lake - West
3
Lower Lake - East
4
Malin - North West
5
Malin - East
6
South Poe Valley
7
Bonanza - East
Potato
5
0
2
1
0
0
0
GPA
1
8
2
2
3
13
2
Other
6
4
7
21
16
27
7
PTW: Potato Tuberworm
BLH: Beet Leafhoppers
OLH: Other Leafhoppers
PSY: Psyllid
GPA: Green Peach Aphid
Volume:
Issue:
Date:
2
2
July 8, 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
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-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).
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
KBREC DD5C IREC DD5C
Daily Total Daily Total
2.8
0.0
2.8
0.0
3.6
3.6
3.5
3.5
4.0
7.6
4.1
7.6
4.7
12.3
4.8
12.4
4.8
17.1
4.8
17.2
4.2
21.4
4.5
21.6
2.4
23.7
3.1
24.7
1.8
25.5
2.7
27.4
4.1
29.7
3.9
31.3
4.3
34.0
4.6
35.9
4.5
38.4
4.6
40.6
4.3
42.8
4.7
45.3
3.6
46.3
4.2
49.5
2.6
48.9
3.5
53.0
2.1
51.0
3.1
56.1
2.0
53.0
3.4
59.5
4.2
57.2
4.4
63.9
4.5
61.7
4.7
68.7
4.8
66.5
5.4
74.1
4.1
70.6
5.2
79.3
4.5
75.1
5.2
84.6
4.0
79.1
4.7
89.3
5.0
84.2
5.1
94.3
6.0
90.2
6.4
100.7
6.1
96.3
7.0
107.7
5.5
101.8 6.6
114.3
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
KBREC DD5C
Daily Total
4.7
106.6
5.5
112.1
7.0
119.1
7.8
126.8
8.3
135.1
8.3
143.4
10.2
153.6
7.1
160.7
7.1
167.9
6.4
174.3
6.4
180.7
5.5
186.2
5.5
191.7
5.9
197.6
5.4
203.0
5.3
208.3
5.6
213.9
6.4
220.3
7.1
227.4
7.8
235.2
8.7
243.9
12.3
256.2
11.7
267.9
10.2
278.0
12.6
290.6
12.0
302.6
IREC DD5C
Daily Total
5.4
119.7
6.1
125.8
7.7
133.5
8.9
142.4
9.7
152.1
10.2 162.3
10.6 172.9
10.3 183.2
10.2 193.4
9.2
202.6
8.5
211.0
7.3
218.4
7.0
225.4
7.4
232.8
7.2
239.9
6.9
246.8
6.9
253.7
7.3
261.0
7.7
268.7
8.6
277.3
9.7
287.0
10.3 297.3
10.4 307.7
9.7
317.5
10.0 327.4
10.5 337.9
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
KBREC DD5C
Daily Total
14.0 316.6
12.6 329.2
13.8 343.0
11.5 354.5
9.7
364.2
9.8
374.0
11.2 385.2
13.2 398.4
15.2 413.6
13.3 426.9
10.4 437.3
10.3 447.6
12.1 459.7
11.0 470.6
10.7 481.3
12.6 493.9
14.6 508.5
16.6 525.1
17.6 542.7
17.0 559.7
16.8 576.4
17.8 594.2
18.8 613.0
16.6 629.6
16.0 645.6
IREC DD5C
Daily Total
11.8
349.7
12.6
362.3
13.2
375.5
13.4
388.9
12.6
401.6
11.7
413.3
12.1
425.5
13.0
438.4
14.2
452.6
14.2
466.8
12.7
479.5
12.5
492.0
13.1
505.1
13.6
518.8
13.4
532.1
13.9
546.0
15.3
561.3
16.1
577.4
17.0
594.4
17.2
611.6
17.0
628.6
17.3
645.9
18.0
663.9
18.6
682.6
17.3
699.9
Volume:
Issue:
Date:
2
2
July 8, 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
KBREC DD5C
Daily Total
16.5
662.1
17.0
679.1
15.1
694.2
15.8
710.0
16.5
726.5
17.3
743.8
17.8
761.6
15.6
777.2
IREC DD5C
Daily Total
16.6
716.5
15.7
732.2
14.6
746.8
15.1
761.9
15.8
777.7
16.4
794.1
17.5
811.6
17.9
829.5
Date
KBREC DD5C
Daily Total
IREC DD5C
Daily Total
Date
KBREC DD5C
Daily Total
IREC DD5C
Daily Total
Volume:
Issue:
Date:
2
2
July 8, 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 drying
during the day.
Insect Trap Reports:: Aphid numbers are on the rise as hay fields have been recently cut. As 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
receiv 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 foliar sprays are warranted. Treatment thresholds are very low (1 beetle per 60 plants). Scout field
fiel 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 we
weed
ed is not a good indicator that an aerial application is
warranted. Tuber / Western Potato Flea Beetles prefer to feed on potatoes and are rarely observed on non
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 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
ed 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 adjustments. I’m relatively confident the values presented to date are very close to what we
would have actually
lly 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
ou 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 and
extension specialists have noted a strong correlation with 300 pdays and the onset of Early Blight. Early emerged potatoes should reach
this target in the next few days while potatoes emerging in early June sshould
hould 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/
6/30.
30. Two of these fields had been
on a 10-14
14 application schedule of fungicides which clearly did not provide adequate protection against infection. Potato Specialists
Specialist have
been recommending a 7 day schedule using manzate and chlorothalonil products. We’
We’ve
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,
such this disease is
always a threat and preventative methods continue to be necess
necessary
ary to disrupt the disease triangle. Be cognizant of your irrigation schedule
to prevent periods of excessive moisture in the lower canopy. Night irrigations not only take advantage of reduced wind which
whic improves
distribution uniformity but allows for better
tter canopy drying during the day. Continue to aggressively scout fields in wet areas for infection
and bring suspect samples for confirmation and take of any cull piles!
Potato Bytes published by: Brian A. Charlton, Research and Extension Agent 541-591
591-1255
Dariin Culp, Fac. Res. Asst 541
541-891-0784