Volume:
4
Issue:
5
Date:
August 3, 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
0.40
0.30
0.20
0.10
0.00
'99‐'11 Avg
Crop Water Use: 1 Soil Degree Data: 2 Soil Degree Data: 3 5 Brian’s Notes 9/15
8/15
7/15
6/15
Inside this Issue: Insect Trap Report 4 2012
5/15
inch / day
Potato Crop Water Use
Early Planting
Historical P-day Accumulation
June 1 -September 15
Potato Crop Water Use
Late Planting
710
inch / day
700
0.40
690
0.30
670
680
660
0.20
'99‐'11 Avg
0.10
2012
650
640
630
620
610
0.00
600
99
6/5 7/5
8/5
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
KBREC
Actual Water Use:
Plan ng Date:
Early
Late
600
Last 3 days:
Last 7 days:
Last 14 days:
0.82 1.89 3.85 0.82 1.87 3.71 400
May 15
June 1
June 15
200
0
2011
Total P-Day Accumulation
Estimated Emergence - August 2
p‐days
Inches
Es mated Water Use:
Next 7 days
2010
9/5
1.89 1.89 2008
2009
2010
2011
2012
Volume:
4
Issue:
5
Date:
August 3, 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 Accumula on ‐‐ KBREC and IREC 2012 For Root‐knot nematode control, Vydate applica ons should begin at 800 degree‐days (DD5C). To es mate 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 es mates the date on which 800 DD5C will occur in that field. It is recommended that applica ons con nue every 14 days un l harvest. For Stubby‐root nematode control, Vydate applica ons should begin at 0 degree‐days (at plan ng) and followed by an applica on at the first full irriga on following emergence. An addi onal applica on 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
IREC DD5C
Daily
Total
2.2
2.2
3.4
5.6
3.1
8.7
3.1
11.8
4.3
16.1
5.5
21.6
6.5
28.1
7.3
35.4
7.4
42.8
7.6
50.4
6.8
57.2
6.0
63.2
5.2
68.4
5.6
74.0
6.6
80.7
7.4
88.0
6.6
94.7
5.9
100.5
6.1
106.7
5.9
112.6
5.5
118.0
6.3
124.3
6.9
131.2
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
5/8/12
5/9/12
5/10/12
7.8
8.6
8.0
7.5
8.4
7.8
6/3/12 10.4
6/4/12 8.9
6/5/12 6.6
139.8
148.4
156.4
138.7
147.1
154.9
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
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
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
12.4
903.6
13.0
916.6
14.0
930.6
14.1
944.7
14.4
959.1
7/25/12
7/26/12
7/27/12
14.3
14.7
14.7
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
14.8
1085.4
15.2
1100.6
16.1
1116.6
16.5
1133.1
17.3
1150.5
973.4 17.7
988.1 17.7
1002.8 17.6
1168.2
1185.8
1203.5
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
Date
7/28/12
7/29/12
7/30/12
7/31/12
8/1/12
8/2/12
KBREC DD5C
Daily
Total
13.9
1016.6
14.2
1030.9
14.1
1044.9
14.0
1059.0
14.3
1073.2
14.4
1087.6
IREC DD5C
Daily
Total
17.1
1220.6
17.1
1237.7
16.8
1254.6
18.9
1273.4
19.2
1292.6
19.0
1311.6
Volume:
4
Issue:
5
Date:
August 3, 2012
Volume:
4
Issue:
5
Date:
August 3, 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 24 - July 31
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
17
13
83
63
50
32
12
PSY
0 PTW: Potato Tuberworm
0 BLH: Beet Leafhoppers
0 OLH: Other Leafhoppers
2 PSY: Psyllid
3
249
0
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
1
2
3
4
5
6
7
8
9
10
0
0
0
0
0
0
0
0
Aphid Traps
Keno
Township South
Township North
East Malin
South Poe Valley
Bonanza
Yonna Valley
Dairy
Swan Lake East
Swan Lake West
Potato
17
43
3
100
28
132
4
22
14
8
0
0
0
0
0
0
0
0
0
17
27
6
28
5
21
23
0
0
5
0
0
2
0
3
GPA
0
0
0
9
0
0
0
0
0
0
Other
369
147
12
559
332
171
8
156
23
4
GPA: Green Peach Aphid
Volume:
4
Issue:
5
Date:
August 3, 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
Insect Trap Reports: Aphid popula ons have experienced a drama c rise in recent weeks. Seed potato producers should imple‐
ment control measures to minimize spread of aphid‐vectored viruses. Psyllids: We have confirmed the first potato psyllid in the Klamath Basin which was collected in a yellow pan trap in the Dairy/
Bonanza area. The specimen has not been tested for the presence Liberibacter, the causal agent of zebra chip. Other psyllids (not potato psyllids) have also been caught in the Frog Pond, Stateline/Akins Rd, Copic Bay, Lower Klamath Lake, and Running Y areas. High popula ons were detected in the Running Y area but DO NOT appear to be potato psyllids. Samples will be sent to Siliva Ron‐
don at the Hermiston Agricultural R&E Center (HAREC) for final confirma on. Please refer to the a ached file on my email mes‐
sage tled ‘Potato Progress’ for addi onal informa on on potato psyllid and zebra chip. This informa on was compiled by Dr. Andy Jensen who is the Regional Research Director for the OR, ID, and WA Potato Commissions. I’ve also included an addi onal a achment tled ‘Potato Update 7‐27‐12’ published by Silvia Rondon and Phil Hamm at HAREC which does a good job of showing product efficacy against various life stages of the psyllid. I know Movento has seen wide adop on in the Klamath Basin this year; however, this product does not appear to have efficacy on adult potato psyllids. As such, you’ll need to review this list and deter‐
mine which product best fits within your produc on plan. Lastly, if you decide to wait un l potato psyllids are found in or close to your fields before implemen ng a control program you must be diligent about scou ng your own fields! These pests are extremely small and very difficult to see. In addi on, we only have 25 trap loca ons which is not a lot considering how widespread potato acreage is in the Basin; therefore, it is quite likely a popula on could establish and yet escape our trap loca ons. Brown Leaf Spot: Brown leaf spot (Alternaria alternata) is a fungal pathogen closely related to Early Blight (Alternaria solani), has become much more prevalent in the Klamath Basin in recent years. I’ve received several calls this week from growers who have no ced widespread infec on the past 10 days. The use of stobilurin fungicides (Quadris, Headline, Reason, Gem, Tanos, Bravo) have done a decent job of suppressing early blight but may not be as efficacious on brown leaf spot. Products with a different mode of ac on such as Luna, Endura, and Revus Top have shown improved control in studies conducted in Idaho. Remember, nearly all fungicides are ‘protec ve’ in nature and few offer ‘cura ve’ proper es. As such, applica ons made to fields with low brown leaf spot infec on should help slow the spread to healthy foliage. This is especially true considering most varie es planted in the Klamath Basin have reached their maximum canopy and won’t be adding new growth. The difficulty is determining whether the cost of an applica on will provide an economic benefit in the form of improved yields for fields with moderate to high brown leaf spot infec on ‐‐especially with R. Norkotah which rou nely begins the ‘early die’ process this me of year and is likely to has‐
ten given the predicted heat in the coming days. Soil Degree‐days: Most fields have reached the 800 DD target. Remember that subsequent Vydate applica ons, every 2 weeks a er the 800 DD target, are needed if this is your only control strategy for root‐knot nematodes. For fields that have had both Vy‐
date and Movento you could likely stretch the amount of me between applica ons.