POTATO PSYLLIDS:The psyllid trapping season is quickly coming to a close. About one-third of our sticky traps in potato fields have been removed for vine killing operations or harvest, and all of the traps will be removed over the next two weeks. But, this week we found potato psyllids in 35% of the fields that still have traps in them. A total of 191 psyllids have been collected in our monitoring network fields this season. This is more than the 97 psyllids we collected by Sept. 15, 2017. But, it is far fewer than the almost 19,000 psyllids we collected by Sept. 16, 2016. This is evidence of some large seasonal fluctuations in potato psyllid populations in the Columbia Basin.
36. Week of Sep 2nd to Sep 8th
MONITORING REPORT:
POTATO PSYLLIDS:This week there...
36. Week of Sep 2nd to Sep 8th
MONITORING REPORT:
POTATO PSYLLIDS:This week there were potato psyllids in 36% of the fields we monitored using yellow sticky cards. Psyllids were found in fields near George, Quincy, Moses Lake, Royal City, Othello, Eltopia, Pasco, Burbank, Paterson, and Plymouth. We expect to find more psyllids in more fields as the season comes to a close. Adult psyllids tend to migrate away from fields with dead or dying vines and move into fields that still have some growth. We have collected a total of 158 psyllids in our monitoring network fields this season. Last year, we had 67 psyllids by Sept. 8. In 2016, we had collected about 17,000 psyllids by Sept. 9. Clearly, the size of potato psyllid populations in the Columbia Basin have varied greatly from season to season.
35. Week of Aug 26th to Sep 1st
MONITORING REPORT:
POTATO PSYLLIDS:This week there...
35. Week of Aug 26th to Sep 1st
MONITORING REPORT:
POTATO PSYLLIDS:This week there were potato psyllids in 26% of the fields we monitored using yellow sticky cards. There were not many psyllids on the cards. We found psyllids in fields near George, Moses Lake, Warden, Mattawa, Othello, Eltopia, Pasco, Burbank, and Plymouth.
34. Week of Aug 19th to Aug 25th
MONITORING REPORT:
POTATO PSYLLIDS:This week there were potato psyllids in 27% of the fi...
34. Week of Aug 19th to Aug 25th
MONITORING REPORT:
POTATO PSYLLIDS:This week there were potato psyllids in 27% of the fields we monitored using yellow sticky cards. We found psyllids on the Royal Slope and near the towns of Mattawa, Othello, Eltopia, Pasco, Burbank, Paterson, and Plymouth. Again this week, there are higher populations in the Lower Columbia Basin.
None of the psyllids we have collected this year have tested positive for Lso (that is the bacterial pathogen spread by psyllids that causes zebra chip), but the HAREC Plant Pathology Clinic in Hermiston reported a couple of positives a few weeks ago.
33. Week of Aug 12th to Aug 18th
MONITORING REPORT:
POTATO PSYLLIDS:This week there...
33. Week of Aug 12th to Aug 18th
MONITORING REPORT:
POTATO PSYLLIDS:This week there were potato psyllids in 32% of the fields we monitored using yellow sticky cards. We found psyllids at locations all over the Basin (George, Royal City, Quincy, Moses Lake, Basin City, Eltopia, Pasco, and Plymouth) but there are more of them in the Lower Columbia Basin.
None of the psyllids we have collected this year have tested positive for Lso (that is the bacterial pathogen spread by psyllids that causes zebra chip), but the HAREC Plant Pathology Clinic in Hermiston reported a couple of positives last week.
32. Week of Aug 5th to Aug 11th
MONITORING REPORT:
POTATO PSYLLIDS:This week there...
32. Week of Aug 5th to Aug 11th
MONITORING REPORT:
POTATO PSYLLIDS:This week there were potato psyllids in 26% of the fields we monitored using yellow sticky cards. Psyllids were on sticky cards near George, Mattawa, Royal City, Eltopia, Pasco, Burbank, and Plymouth (i.e, all across the Basin).
31. Week of Jul 29th to Aug 4th
MONITORING REPORT:
POTATO PSYLLIDS:We found potato...
31. Week of Jul 29th to Aug 4th
MONITORING REPORT:
POTATO PSYLLIDS:We found potato psyllids in 20% of the fields we are monitoring using yellow sticky cards. These were on sticky cards near George, Mattawa, Bruce, Eltopia, Pasco, and Plymouth (i.e, all across the Basin). Potato psyllids are migrating into potato fields all over the Columbia Basin now.
SCOUT FOR PSYLLID NYMPHS & EGGS: If you find psyllid eggs or nymphs, then you might want to reconsider your earlier psyllid management program and you might want to apply an insecticide that will control eggs and nymphs. If you are also needing to control spider mites, there are several pest control products that target both immature psyllids and mites.
30. Week of Jul 22nd to Jul 28th
MONITORING REPORT:
POTATO PSYLLIDS:We found potato...
30. Week of Jul 22nd to Jul 28th
MONITORING REPORT:
POTATO PSYLLIDS:We found potato psyllids on 10% of the traps deployed for our monitoring network, but saw some more on cards brought to us by cooperating consultants. Please note that the maps below may not represent the full extent of distribution this week, because they do not include the results from locations outside of our monitoring network. Most of the cooperator's psyllids were found in areas east of the Tri-Cities. Potato psyllids are migrating into potato fields all over the Columbia Basin now.
29. Week of Jul 15th to Jul 21st
MONITORING REPORT:
POTATO PSYLLIDS:We found potato ps...
29. Week of Jul 15th to Jul 21st
MONITORING REPORT:
POTATO PSYLLIDS:We found potato psyllids on 23% of the traps deployed for our monitoring network, and also saw them on several cards brought to us by cooperating consultants. These psyllids were collected in fields near Paterson, Burbank, Pasco, Eltopia, Royal City, Moses Lake, and Quincy. This means that potato psyllids are migrating into potato fields all over the Columbia Basin.
?START SCOUTING FOR PSYLLID NYMPHS & EGGS: We started seeing adult potato psyllids moving into potato fields several weeks ago. If these psyllids were not controlled upon arrival, then they have probably started to establish new colonies in potato fields. When conditions are ideal, it takes less than a month for potato psyllids to complete a generation. So, it is time to start monitoring for immature psyllid life stage, i.e. the eggs and nymphs. Collect 10 leaves from 10 locations from the 10 outer rows of the field. Look on the leaf edges for eggs, and on the underside of the leaves for nymphs. If you find them, then you might want to reconsider your earlier psyllid management program and you might want to apply an insecticide that will control eggs and nymphs.
28. Week of Jul 8th to Jul 14th
MONITORING REPORT:
POTATO PSYLLIDS:We collected po...
28. Week of Jul 8th to Jul 14th
MONITORING REPORT:
POTATO PSYLLIDS:We collected potato psyllids at several more locations this week. We found them on 18% of the traps on our monitoring network, and also saw them on several cards brought to us by cooperating consultants. Most of these have been in fields in the Lower Columbia Basin, but a few have also been found near Othello and Moses Lake. If they follow the usual pattern, then we expect potato psyllids to be found in several more potato fields next week.
27. Week of Jul 1st to Jul 7th
MONITORING REPORT:
POTATO PSYLLIDS:Potato psyllids are slowly moving into Columbia Basin...
27. Week of Jul 1st to Jul 7th
MONITORING REPORT:
POTATO PSYLLIDS:Potato psyllids are slowly moving into Columbia Basin potato fields now, but we are not finding a lot of them yet. This week we found one potato psyllid on our network of sticky cards in a potato field south of Moses Lake.Last week, we found one near Paterson, and a few more on sticky cards that were brought to us by cooperating consultants from the Eltopia and Pasco areas. We are still going through this week's sticky cards from cooperators, but so far we have seen one potato psyllid on a card that was near Pasco.
The graph below looks at the weekly distribution of potato psyllids to potato fields during the season, and compares results from 2013 to 2018. Potato psyllids spread quickly to potatoes across the Basin in 2016, but very slowly in 2017. So far, it looks like 2018 will be more like 2014 and 2017 with a relatively slow distribution of potato psyllids across the region.
?
TESTING POTATO PSYLLIDS FOR LIBERIBACTER: The psyllids we collect are sent to a laboratory to determine if they are carrying the bacterium (Liberibacter) that causes zebra chip diseases. We do not recommend that you base management decisions on whether or not the psyllids we test are carriers of the bacterium. Since 2013, the infection rate of potato psyllids tested from our program in the Columbia Basin has been extremely low (average 0.14%) and yet we still find some zebra chip in the potato crop each year. So, testing the psyllids has not proven to be a useful tool for predicting zebra chip outbreaks in the Columbia Basin of Washington. But, this could change if we ever see an increase in the proportion of infected psyllids. Note that potato psyllids collected for the monitoring program in Idaho (managed by Erik Wenninger, University of Idaho) have had infection rates ranging from less than 2% to as high as 28%; and zebra chip was much more prevalent during the season with the highest infection rate.
26. Week of Jun 24th to Jun 30th
MONITORING REPORT:
POTATO PSYLLIDS:This week we found...
26. Week of Jun 24th to Jun 30th
MONITORING REPORT:
POTATO PSYLLIDS:This week we found one potato psyllid on our network of sticky cards in a potato field west of Paterson,WA.We also found 7 more on sticky cards dropped off by cooperators from four potato fields located near Pasco, WA. These findings indicate that potato psyllids are moving into potato fields now, especially in the Lower Columbia Basin. Some of our colleagues, who have been monitoring potato psyllids on alternate host plants like matrimony vine (a.k.a. Lycium) and bittersweet nightshade in Central and Eastern WA, reported that potato psyllids were difficult to find in the spring. But, they have recently noted an increase in the numbers they are finding.
25. Week of Jun 17th to Jun 23rd
MONITORING REPORT:
POTATO PSYLLIDS:We found one potat...
25. Week of Jun 17th to Jun 23rd
MONITORING REPORT:
POTATO PSYLLIDS:We found one potato psyllid this week on a sticky card deployed in a potato field near Pasco. This sticky card was submitted to us by one of the crop consultants we work with.
24. Week of Jun 10th to Jun 16th
MONITORING REPORT:
POTATO PSYLLIDS: We have not fou...
24. Week of Jun 10th to Jun 16th
MONITORING REPORT:
POTATO PSYLLIDS: We have not found any potato psyllids on our network of traps covering 46 potato fields in the Columbia Basin. The first potato psyllids usually appear on our traps in late May or early June. Last week, some potato psyllids collected in the Lower Columbia Basin were submitted to Oregon State University HAREC in Hermiston. So, it looks like there are some psyllids starting to move from overwintering sites in the region. The trapping network overseen by University of Idaho personnel has also been finding a few potato psyllids moving into potato fields in southwest and south-central areas.
23. Week of Jun 3rd to Jun 9th
MONITORING REPORT:
POTATO PSYLLIDS: We have not fou...
23. Week of Jun 3rd to Jun 9th
MONITORING REPORT:
POTATO PSYLLIDS: We have not found potato psyllids on our monitoring network traps in the Columbia Basin yet, however the OSU HAREC Plant Pathology Diagnostic Lab reported that several psyllids were brought in to them from traps deployed in the Lower Columbia Basin. The first potato psyllids usually appear in late May or early June in the Columbia Basin.
22. Week of May 27th to Jun 2nd
MONITORING REPORT:
POTATO PSYLLIDS:We have not found any potato psyllids in potato fields i...
22. Week of May 27th to Jun 2nd
MONITORING REPORT:
POTATO PSYLLIDS:We have not found any potato psyllids in potato fields in the Columbia Basin this season. We are monitoring 46 potato fields across the Basin using yellow sticky cards and have also been looking at some sticky cards deployed by cooperating farms. The first potato psyllids usually appear in late May or early June. Yesterday, it was announced that one potato psyllid had been found in Canyon County in Southern Idaho.
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