Volume:
4
Issue:
2
Date:
July 13, 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:
inch / day
Potato Crop Water Use
Early Planting
Crop Water Use:
1
0.40
Soil Degree Data:
2
0.30
Insect Trap Report
3
Brian’s Notes
4
'99-'11 Avg
0.20
2012
0.10
0.00
5/15
6/15
7/15
8/15
9/15
Historical P-day Accumulation
June 1 -September 15
Potato Crop Water Use
Late Planting
710
0.30
700
690
inch / day
0.25
680
670
0.20
660
0.15
'99-'11 Avg
0.10
2012
650
640
630
620
0.05
610
600
0.00
99
6/5
7/5
8/5
2000
2001
KBREC
2003
2004
2005
2006
2007
2008
2009
2010
2011
Total P-Day Accumulation
Estimated Emergence - July 12
Inches
Actual Water Use:
Plan8ng Date:
2002
9/5
Early
400
350
Late
300
0.86
0.71
Last 7 days:
1.9
1.53
Last 14 days:
3.44
2.63
May 15
200
June 1
150
June 15
100
50
Es8mated Water Use:
Next 7 days
250
p-days
Last 3 days:
0
2.03
1.68
2008
2009
2010
2011
2012
Volume:
4
Issue:
2
Date:
July 13, 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
Daily
Total
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
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
5/8/12
5/9/12
5/10/12
7.8
8.6
8.0
7.5
8.4
7.8
138.7
147.1
154.9
139.8
148.4
156.4
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
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
6/3/12 10.4
6/4/12 8.9
6/5/12 6.6
371.8
380.7
387.3
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
12.7
11.5
10.2
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
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
11.3
11.4
11.9
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
12.7
712.7
13.1
725.9
13.8
739.7
14.4
754.1
14.5
768.6
14.8
783.3
15.0
798.3
14.6
812.9
14.4
827.3
14.1
841.3
13.3
854.6
12.4
867.0
12.1
879.1
12.1
891.2
IREC DD5C
Daily
Total
16.2
782.0
16.6
798.6
16.1
814.6
16.6
831.3.
17.0
848.2
16.8
865.0
17.3
882.3
18.3
900.6
18.9
919.4
18.9
938.3
19.9
958.2
18.4
976.6
17.5
994.1
16.8
1010.9
16.0
1026.9
14.3
1041.2
14.6
1055.8
14.8
1070.6
Volume:
4
Issue:
2
Date:
July 13, 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
July 3 - July 10
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
0
0
0
OLH
50
9
16
14
4
8
14
PSY
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
6
3
2
3
6
12
8
14
0
0
0
0
0
0
0
0
Potato
5
2
3
10
5
1
1
1
1
0
GPA
0
0
0
3
0
0
0
0
0
0
Other
17
7
6
35
23
7
22
2
17
1
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
Township South
Township North
East Malin
South Poe Valley
Bonanza
Yonna Valley
Dairy
Swan Lake East
Swan Lake West
GPA: Green Peach Aphid
Volume:
4
Issue:
2
Date:
July 13, 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
Crop Water Use: Irrigation frequency has accelerated with the onset of hot weather. Proper irrigation during such hot weather is
critical to minimizing internal tuber disorders – namely hollow heart and brown center. Growth cracks and secondary growth can
also be problematic during such hot weather. Check fields regularly as scheduling is likely to be more frequent than past weeks.
Insect Trap Reports: Insect pressure remains relatively low. Aphid numbers in yellow pan traps increased this past week. Expect
numbers to increase in the weeks to come as we typically see population spikes during mid-late July.
Psyllids: We have not found potato psyllids yet this year. However, ‘other psyllids’ have been caught in yellow pan traps but at
very low number. Remember, only potato psyllids transmit Liberibacter, the causal agent, of zebra chip.
Soil Degree-Day Accumulation: Early planted potatoes (May 1) on muck soil reached the 800 degree-day (5C) about 4 days ago
while those planted in mid-May are about 3 days away. Early planted potatoes on mineral soil are about a week from reaching the
target. Remember, these values are derived from automated weather stations at KBREC and IREC and are likely different than
temperatures in your own potato field. To optimize timing it is best to use temperatures from you own field.
P-day Accumulation: Potatoes which emerged around May 15 are approaching 300 p-days and control measures from Early Blight
are advised for Russet Norkotah fields that are highly prone to infection. Potatoes that emerged around June 1 are about 2 weeks
away from reaching this target.