Potato Extension
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.
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