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Andy Robinson

Potato Extension Agronomist

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Potato Extension

Blightline Sep 9, 2019

Blightline Sep 9, 2019

Late blight is NOT reported in ND, MN or MB. Some fields have been vine-killed or harvested already, but it is important to monitor fields that remain green for the next week or two. Late season outbreaks can result in tuber infection and secondary soft rot in the field or storage. Stay on the lookout for late season disease, especially near pivots, shelterbelts and other areas that stay wet for longer periods. It has been a good season so far with no late blight. This will be the last regularly scheduled NDSU Potato Blightline for 2019 unless late blight is found. We anticipate the Blightline continuing in 2020.

Blightline Sep 9, 2019 - Read More…

Late blight spore trapping network report August 19-26, 2019

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 19-26, 2019 - Read More…

Late blight spore trapping network report August 12-19, 2019

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 12-19, 2019 - Read More…

Late blight spore trapping network report August 5-12, 2019

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.

Late blight spore trapping network report August 5-12, 2019 - Read More…

Aphid Alert, week ending August 9, 2019

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.

Aphid Alert, week ending August 9, 2019 - Read More…

Blightline August 12, 2019

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.

Blightline August 12, 2019 - Read More…

Late blight spore trapping network report, July 29 - August 5

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.

Late blight spore trapping network report, July 29 - August 5 - Read More…

Blightline August 5, 2019

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.

Blightline August 5, 2019 - Read More…

Late blight spore trapping network report, July 15-29

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.

Late blight spore trapping network report, July 15-29 - Read More…

Blightline July 29, 2019

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.

Blightline July 29, 2019 - Read More…

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