Volume:
4
Issue:
1
Date:
July 6, 2012
Potato Bytes
Klamath Basin Research and Extension Center
6941 Washburn Way
Klamath Falls, Oregon 97603
(tel)541-883-4590 (fax) 541-883-4596
h*p://oregonstate.edu/dept/kbrec
Brian A. Charlton, Research and Extension Agent - 541-591-1255
Inside this Issue:
Potato Crop Water Use
Early Planting
Insect Trap Report: 2
0.30
inch / day
1
Crop Water Use:
Soil Degree Data:
3
Brian’s Notes:
4
0.20
'99-'11 Avg
0.10
2012
9/15
8/15
7/15
6/15
5/15
0.00
Historical P-day Accumulation
June 1 -September 15
Potato Crop Water Use
Late Planting
710
0.30
700
0.25
680
690
inch / day
670
0.20
660
0.15
'99-'11 Avg
0.10
2012
650
640
630
620
610
0.05
600
99
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
0.00
6/5
7/5
8/5
9/5
Total P-Day Accumulation
Estimated Emergence - July 5
KBREC
350
Inches
Actual Water Use:
Plan8ng Date:
Early
Late
Last 3 days:
0.73
0.54
Last 7 days:
1.54
1.1
Last 14 days:
2.62
1.81
300
p-days
250
200
May 15
150
June 1
June 15
100
50
Es8mated Water Use:
Next 7 days
0
1.68
1.26
2008
2009
2010
2011
2012
Volume:
4
Issue:
1
Date:
July 6, 2012
Potato Bytes
Klamath Basin Research and Extension Center
6941 Washburn Way
Klamath Falls, Oregon 97603
(tel)541-883-4590 (fax) 541-883-4596
h*p://oregonstate.edu/dept/kbrec
Brian A. Charlton, Research and Extension Agent - 541-591-1255
Insect Trap Report
June 21 - July 2
Klamath County
TRAP
1
2
3
4
5
6
7
LOCATION
Anderson Rd., Merrill
Old Malin Hwy.
Pickett & Drazil, Malin
Lower Lake
Running Y
Caledonia
Tingley Lane
PTW
0
0
0
0
0
0
0
BLH
0
0
0
0
1
0
0
OLH
7
1
0
2
4
4
7
PSY
0
0
0
0
0
0
0
1
0
1
2
0
0
0
0
0
0
0
0
0
0
0
0
PTW: Potato Tuberworm
BLH: Beet Leafhoppers
OLH: Other Leafhoppers
PSY: Psyllid
Modoc and Siskiyou
8
9
10
11
12
13
14
15
Perez Overhead
Road 101 Tulelake
Frog Pond 361
Southwest Sump
Frog Pond 345
Stateline and Akins
Ganger Road
Copic Bay
Aphid Traps
1
2
3
4
5
6
7
8
9
10
Keno
Townshhip South
Township North
East Malin
South Poe Valley
Bonanza
Yonna Valley
Dairy
Swan Lake East
Swan Lake West
0
0
0
0
0
0
0
0
Potato
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
GPA
0
0
0
0
0
0
0
0
0
0
Other
6
5
3
10
2
13
2
4
8
8
GPA: Green Peach Aphid
Volume:
4
Issue:
1
Date:
July 6, 2012
Potato Bytes
Klamath Basin Research and Extension Center
6941 Washburn Way
Klamath Falls, Oregon 97603
(tel)541-883-4590 (fax) 541-883-4596
h*p://oregonstate.edu/dept/kbrec
Brian A. Charlton, Research and Extension Agent - 541-591-1255
Soil Degree-Day Accumula8on -- KBREC and IREC 2012
For Root-knot nematode control, Vydate applica8ons should begin at 800 degree-days (DD5C).
To es8mate 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 es8mates the date on which 800 DD5C
will occur in that field. It is recommended that applica8ons con8nue every 14 days un8l harvest.
For Stubby-root nematode control, Vydate applica8ons should begin at 0 degree-days (at plan8ng)
and followed by an applica8on at the first full irriga8on following emergence. An addi8onal
applica8on is recommended at 800 degree-days (DD5C).
Date
4/15/12
4/16/12
4/17/12
4/18/12
4/19/12
4/20/12
4/21/12
4/22/12
4/23/12
4/24/12
4/25/12
4/26/12
4/27/12
4/28/12
4/29/12
4/30/12
5/1/12
5/2/12
5/3/12
5/4/12
5/5/12
5/6/12
5/7/12
KBREC DD5C
Total
Daily
2.2
2.2
3.9
6.1
3.2
9.3
3.2
12.5
4.2
16.7
5.6
22.3
6.9
29.2
7.6
36.8
7.6
44.4
7.7
52.1
6.7
58.8
6.1
64.9
5.2
70.1
5.7
75.9
6.9
82.8
7.3
90.1
6.2
96.3
5.4
101.7
5.5
107.2
5.8
112.9
5.4
118.3
6.4
124.8
7.2
132.0
Daily
2.2
3.4
3.1
3.1
4.3
5.5
6.5
7.3
7.4
7.6
6.8
6.0
5.2
5.6
6.6
7.4
6.6
5.9
6.1
5.9
5.5
6.3
6.9
5/8/12
5/9/12
5/10/12
7.8
8.6
8.0
7.5
8.4
7.8
139.8
148.4
156.4
IREC
Total
2.2
5.6
8.7
11.8
16.1
21.6
28.1
35.4
42.8
50.4
57.2
63.2
68.4
74.0
80.7
88.0
94.7
100.5
106.7
112.6
118.0
124.3
131.2
DD5C
Date
5/11/12
5/12/12
5/13/12
5/14/12
5/15/12
5/16/12
5/17/12
5/18/12
5/19/12
5/20/12
5/21/12
5/22/12
5/23/12
5/24/12
5/25/12
5/26/12
5/27/12
5/28/12
5/29/12
5/30/12
5/31/12
6/1/12
6/2/12
138.7 6/3/12
147.1 6/4/12
154.9 6/5/12
KBREC DD5C
Daily
Total
8.1
164.5
8.6
173.0
9.5
182.5
10.2
192.7
10.8
203.5
10.7
214.2
9.8
224.0
8.2
232.1
8.5
240.7
9.0
249.7
9.5
259.1
8.7
267.8
8.3
276.1
7.9
284.0
6.5
290.5
6.4
296.9
6.7
303.7
7.5
311.2
8.2
319.4
9.1
328.5
10.3
338.8
11.1
349.9
11.5
361.4
IREC DD5C
Daily
Total
8.8
163.7
10.1
173.7
10.4
184.1
10.7
194.9
11.3
206.2
11.1
217.3
10.3
227.6
9.5
237.1
10.1
247.2
11.0
258.2
11.5
269.7
10.8
280.5
10.3
290.8
9.4
300.2
8.4
308.6
8.2
316.8
8.7
325.5
10.5
336.1
11.7
347.7
12.1
359.9
12.9
372.8
13.5
386.3
13.4
399.7
KBREC DD5C
Daily
Total
6.9
394.2
7.4
401.6
7.3
408.9
7.7
416.6
8.3
424.8
9.6
434.5
10.6
445.0
10.6
455.7
11.1
466.8
11.5
478.2
12.0
490.3
12.6
502.9
12.3
515.1
11.2
526.3
11.3
537.6
11.7
549.3
10.8
560.1
9.3
569.3
8.9
578.2
9.1
587.3
8.8
596.1
9.8
605.9
10.5
616.3
10.4
8.9
6.6
12.7
11.5
10.2
11.3
11.4
11.9
371.8
380.7
387.3
Date
6/6/12
6/7/12
6/8/12
6/9/12
6/10/12
6/11/12
6/12/12
6/13/12
6/14/12
6/15/12
6/16/12
6/17/12
6/18/12
6/19/12
6/20/12
6/21/12
6/22/12
6/23/12
6/24/12
6/25/12
6/26/12
6/27/12
6/28/12
412.4 6/29/12
423.9 6/30/12
434.1 7/1/12
IREC DD5C
Daily
Total
10.5
444.6
10.9
455.5
10.7
466.2
10.4
476.6
10.6
487.2
12.2
499.5
13.4
512.9
13.3
526.2
13.4
539.6
13.5
553.0
13.5
566.5
13.7
580.2
13.0
593.3
12.5
605.8
13.1
618.9
13.9
632.9
13.2
646.1
12.0
658.1
11.9
670.0
12.1
682.1
12.4
694.5
13.0
707.5
13.8
721.3
627.6 14.5
639.1 14.8
651.0 15.2
735.8
750.6
765.9
Date
7/2/12
7/3/12
7/4/12
7/5/12
7/6/12
7/7/12
7/8/12
7/9/12
7/10/12
7/11/12
7/12/12
7/13/12
7/14/12
7/15/12
7/16/12
7/17/12
7/18/12
7/19/12
7/20/12
7/21/12
7/22/12
7/23/12
7/24/12
7/25/12
7/26/12
7/27/12
KBREC DD5C
Daily
Total
12.2
663.1
12.4
675.6
12.1
687.6
12.4
700.0
IREC DD5C
Daily
Total
16.2
782.0
16.6
798.6
16.1
814.6
16.6
831.3.
Volume:
4
Issue:
1
Date:
July 6, 2012
Potato Bytes
Klamath Basin Research and Extension Center
6941 Washburn Way
Klamath Falls, Oregon 97603
(tel)541-883-4590 (fax) 541-883-4596
h*p://oregonstate.edu/dept/kbrec
Brian A. Charlton, Research and Extension Agent - 541-591-1255
Brian’s Notes
General Information: I think most would agree weather patterns during late April and May were quite pleasant for
planting. However, average daily low temperatures during June were very similar to last year which was among the
lowest the last 5 years. As such, frequent frost protection has kept soil profiles damp making timely herbicide application difficult and contributing to stand issues in some lots. Despite these issues I think most wouldn’t trade for current
weather in the Northeast (too wet) or Midwest (too hot). I hope you find these issues of Potato Bytes in 2012 useful
and remember to contact me if you have suggestions for improvement.
Crop Water Use: Usage was higher the second half of June compared to the prior 10-yr average and will definitely
picked up with 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: Sticky traps were placed throughout the Klamath Basin on June 22. Basin Fertilizer & Chemical is graciously collecting them on a weekly basis. Overall insect pressure is relatively low. Aphid numbers in yellow pan traps are relatively low and quite stable throughout the basin.
Psyllids: As most of you are aware, potato psyllids were found in mid-June in the Columbia Basin and have been
found on peppers being sold to consumers in southern Idaho. To my knowledge, all samples have tested negative for
Liberibacter – the bacterium associated with zebra chip. Volunteers from zebra chip infected fields have emerged in
the Columbia Basin and tested positive for Liberibacter which represents a potential source of inoculum. Detection of
psyllids in the Klamath Basin has not occurred despite annual trapping efforts which began in 2009. We do know that
one tuber grown in the southern part of the Klamath Basin tested positive for Liberibacter and exhibited zebra chip
symptoms in 2011; however, this was the only reported incidence. Imidacloprid, Abamectin, Pymetrozine, and Spirotetramat have been the most commonly applied active ingredients in the southern USA where this pest has been most
prevalent in recent years. Please contact me for more information on how to sample your own field or accurately identify potential suspects.
Soil Degree-Day Accumulation: Values are slightly ahead of 2011 but a couple of days behind the prior 3-yr average.
Early planted potatoes on muck soil should reach the 800 degree-day (5C) target in the next week while those on mineral soil are about 2 to 2.5 weeks away. Be sure to check weekly as these values are updated. As expected, data from
your own field is preferred to optimize application timing.
P-day Accumulation: P-days are a measure of potato physiological growth from the time of emergence. Early, mid,
and late planted potatoes are on par with the prior 5-year average. Research data has shown a strong correlation with
300 pdays and the onset of Early Blight. Early emerged potatoes are about a week from reaching this target while late
planted potatoes are approximately 3 weeks away. A preventative fungicide might be warranted if you routinely experience problems with this disease as the target is getting close