News
Late blight spore trapping network report August 19-26, 2019
No late blight has been found in the spore traps scattered in Minnesota and North Dakota. However, three spore traps from Manitoba reported finding late blight spores this week. An updated report from August 12-19 is provided in Figure 1. The week of August 19-26 reported no late blight spores found (Figure 2). As the legend in the map indicates, green dots indicate no late blight spores recovered at the marked locations and grey dots indicate no report.
Late blight spore trapping network report August 12-19, 2019
More filters arrived for the week of August 5-12. An updated report for this time period found no late blight spores during this time period (Figure 1). The week of August 12-19 reported no late blight spores in the 14 traps that arrived (Figure 2). As the legend in the map indicates, green dots indicate no late blight spores recovered at the marked locations and grey dots indicate no report.
Late blight spore trapping network report August 5-12, 2019
There were more filters that came in for the week of July 29 to August 5. An updated report for this time period found no late blight spores during this time period. The week of August 5-12 also found no late blight spores in the 9 traps reported. As the legend in the map indicates, green dots indicate no late blight spores recovered at the marked locations and grey dots indicate no report.
Aphid Alert, week ending August 9, 2019
Aphid numbers took a big jump this week, with some important vector species (including Green Peach Aphid) making appearances. Cumulative seasonal catch increased by almost 50% with last week's catch from 214 last week up to 411 including this week's catches. Consequently the Vector Risk numbers rose sharply, doubling over last week.
Blightline August 12, 2019
NDSU Potato Blightline 12 August 2019. More good news. Late blight is NOT reported in ND, MN or MB. Late blight is reported in multiple locations in WI. The cool weather, closed rows, rain and morning dew are ideal conditions for late blight. The spore-trapping network in ND and MN has not yet detected spores of P. infestans, the cause of late blight. We commonly see first late blight infections in the field in early August, so it is important for all growers and consultants should be actively scouting fields for late blight, especially near pivots, shelterbelts and other areas that stay wet for longer periods.
Late blight spore trapping network report, July 29 - August 5
Welcome to the NDSU/UMN Potato Late Blight spore trapping network. The week of July 29 to August 5 is reported below with 9 locations reporting over this time period. No late blight spores or DNA were recovered in the filters. As the legend in the map indicates, green dots indicate no late blight spores recovered at the marked locations and grey dots indicate no report.
Blightline August 5, 2019
Late blight has not been reported in ND, MN or MB. Small outbreaks of late blight are reported in WA, WI and PA. The spore-trapping network in ND and MN has not detected spores of P. infestans, the cause of late blight. The high humidity, morning dew and rain showers are providing extended conditions that favor late blight infection. We commonly see first late blight infections in the field in early August, so it is important for all growers and consultants to actively scout fields for late blight, especially near pivots, shelterbelts and other areas that stay wet for longer periods.
Late blight spore trapping network report, July 15-29
Welcome to the third report from the NDSU/UMN Potato Late Blight spore trapping network. Two weeks (July 15-29) are combined in this report with 16 locations reporting over this time period. No late blight spores were recovered in the filters. As the legend in the map indicates, green dots indicate no late blight spores recovered at the marked locations and grey dots indicate no report.
Blightline July 29, 2019
NDSU Potato Blightline 29 July 2019. Late blight has not been reported in ND, MN or MB. Small outbreaks of late blight have been reported in the Columbia Basin of WA, Wood County WI and Erie County PA. Late blight severity values (DSV’s) in all potato growing areas have exceeded 15, the critical risk value at wh for late blight spores ich late blight infection will occur if inoculum is present.
Late Blight Spore Trapping Network report week ending July 15
Welcome to the second report from the NDSU/UMN Potato Late Blight spore trapping network. There were 7 locations reporting from the week of July 9-15. No late blight spores were recovered in the filters. As the legend in the map indicates, green dots indicate no late blight spores recovered at the marked locations.
Late Blight Spore Trapping Network report week ending July 8
Welcome to the first report from the NDSU/UMN Potato Late Blight spore trapping network. There were 6 locations reporting for the first week ending July 8. No late blight spores were recovered in the filters.
Blightline July 22, 2019
NDSU Potato Blightline 22 July 2019. Late blight has not been reported in ND, MN or MB. Late blight has been reported in the Columbia Basin of WA and in central WI. Late blight severity values (DSV’s) in all potato growing areas have exceeded 15, the critical risk value at which late blight infection will occur if inoculum is present.
Blightline July 15, 2019
Late blight has not been reported in ND, MN or MB in 2019, but late blight severity values (DSV’s) in all potato growing areas have exceeded 15, the critical risk value at which late blight infection will occur if inoculum is present.
MN Area II Field Day - July 16 at 5:30 pm
MN Area II Potato Council Field Day will be held on July 16 at 5:30 pm at the Becker Sand Plains Experiment Station. A new location this year, so please pay attention to the directions.
Aphid Alert for week of June 30
Traps are out and 3 locations reported on Friday June 30, Grenora & Tappen ND and Crookston MN.
Blightline 3 July 2019
This is the first issue of the 2019 NDSU Potato Blightline. There have been some changes to the Blightline this year. The telephone hotline is not available this year, but the Blightline will be sent to our list serve recipients. Late blight severity values and maps are still available on NDAWN as in the past at https://ndawn.ndsu.nodak.edu/potato-late-blight.html.
Identifying Herbicide Injury in Potato Production
In this article I will explain and show specifically what the responses of potato plants are to some common modes of action. Understanding what the mode of action is can help narrow down the type of herbicide and how it can affect plant and tuber growth. I discuss some common translocating herbicides I often observe when determining injury in potato plants and tubers. They are, ALS-inhibitors, growth regulators, and EPSP synthase inhibitor (glyphosate).
Blightline for 2019: Potato Blight App
Last year, the NDAWN Potato Blight app was launched to help potato growers have more accurate late blight and early blight notifications for individual fields. After some updates, we are excited to let you know that the NDAWN Potato Blight will be the key resource for late blight and early blight predictive models for the 2019 growing season. In addition to North Dakota, we expect this app to be available for Minnesota growers in 2019.
ND8068-5Russ 2018 Research Results
The breeding process for potatoes takes a long time, typically 10 to 15 years. However, after new varieties are released potato growers often do not understand how to best grow them because every potato variety responds differently. ND8068-5Russ responded well to high nitrogen rates, early in the season. Future studies should focus on higher nitrogen rates applied early in the growing season.
Tater Talk
We will be having a Tater Talk on April 4 at 10:30-12:00 at Jack and Jim's. This is an opportunity for potato growers to learn about and ask some questions prior to planting. Please come and bring your questions. Lunch will be provided.
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