{"id":2474,"date":"2020-03-27T10:36:54","date_gmt":"2020-03-27T14:36:54","guid":{"rendered":"https:\/\/site.extension.uga.edu\/colquittag\/?p=2474"},"modified":"2020-03-27T10:36:56","modified_gmt":"2020-03-27T14:36:56","slug":"2020-peanut-seed-quality-and-seed-treatments-2","status":"publish","type":"post","link":"https:\/\/site.extension.uga.edu\/colquittag\/2020\/03\/2020-peanut-seed-quality-and-seed-treatments-2\/","title":{"rendered":"2020 Peanut seed quality and seed treatments"},"content":{"rendered":"\n

Below are words from Dr Bob Kemerait on the current peanut seed quality and seed quality situation\u00a0<\/strong><\/p>\n\n\n\n

We\n have received many questions in recent days pertaining to the quality \nissues facing our peanut seed supply in 2020 and relative performance of\n seed treatments Dynasty PD and <\/strong>Rancona<\/strong>.\n  Below is the information that you need to know now; as more \ninformation is developed we will pass it to you quickly.  As you know, <\/strong>Rancona<\/strong> and\n Dynasty PD both contain several fungicides; however they do not contain\n the same fungicides.  This is noteworthy in 2020 when <\/strong>Aspergillus <\/em>flavus<\/em> seems to be especially important.<\/strong>\n\n1. We have multiple years of data showing that Dynasty and Rancona are both very good seed treatments for peanuts.  \n\n2. There has been a tendency for Rancona being stronger on Aspergillus than Dynasty.  This was with Aspergillus <\/em>niger<\/em>which has been our primary seed pathogen in recent years.  \n\n3. UGA grad student Brian Jordan’s work showing that the mutation for high level resistance to QoI’s can occur in A. <\/em>niger<\/em> supports the clearly reduced efficacy of azoxystrobin(Abound) in furrow, and also on seed (although fludioxinilin Dynasty on seed would help moderate that effect).  \n\n4. Those\n differences in control may or may not have been enough to make a \ndifference in yield, although the pattern was there for that in some \ntrials<\/strong><\/p>\n\n\n\n

The biggest issue we face with seed quality in 2020 is that this is a different scenario with Aspergillus <\/em>flavus<\/em> (a related, but different, pathogen).  <\/p>\n\n\n\n

Here is what we know now:<\/strong><\/p>\n\n\n\n

1)  Last season was extremely hot and dry.  There is a much higher frequency of Aspergillus <\/em>flavus<\/em> in our peanut seed from last year than we usually see.  A. <\/em>flavus<\/em> produces aflatoxin, but it can also be an important seedling pathogen.<\/strong><\/p>\n\n\n\n

2)  Culturing the pathogens from seed shows a huge difference in the efficacy of Dynasty and Rancona on this seed borne A. <\/em>flavus<\/em>, at least in some seed lots which were identified as being of lower germination.  <\/p>\n\n\n\n

3) Rancona has considerably less incidence of A. <\/em>flavus<\/em> growth in these seed lots.  The difference in seed treatments for inhibition of A. <\/em>flavus<\/em> is believed to help explain some of the differences in germination observed, with Rancona producing significantly higher germinations.   Again, this is on some seed lots and not others.<\/strong>  Preliminary evidence is that the later-harvested seeds, which were exposed to the most heat and drought, are the most likely to have high Aspergillus levels.<\/p>\n\n\n\n

What does<\/strong> all of<\/strong> this mean?<\/strong>  Are the differences observed this year due to A. <\/em>flavus<\/em> being resistant to QoI fungicides as sometimes occurs in A. niger?\n  That issue is not known, but is being evaluated as quickly as \npossible.  There is much we still need to learn, but for now we can say \nthe following:\n\n1) Rancona and Dynasty have both been very good seed treatments.  This year, with the emergence of A. <\/em>flavus<\/em>, Rancona will probably be more effective treatment on those lots with elevated A. <\/em>flavus<\/em> populations.  (Elevated A. <\/em>flavus<\/em> populations seem to be linked to seed lots with lower germination). \n\n2) High quality seed with similar germinations on the <\/strong>Rancona<\/strong> and Dynasty will probably be fine with either product as the seed treatment.<\/strong>\n\n3) Either seed treatment will likely benefit from the addition of an in furrow spray.\n  Proline and Velum Total have been the most consistent in recent years.\n   Abound should not be paired with Dynasty, as it duplicates the \nchemistry most prone to resistance.  Abound would add an additional \nchemical class where Rancona is being used, and may help with other seed pathogens other than QoI-resistant Aspergillus.\n\n4) If\n seed that is to be planted has (or is suspected to have lower \ngermination rates), and the seed has been treated with Dynasty PD, then \nthere is a greater need to consider use of additional infurrow \napplications of Proline or Velum Total to protect stands.\n\n<\/p>\n\n\n\n

NOTE: <\/strong>We cannot become too narrowly focused as many different pathogens can affect peanut seed<\/strong>!<\/strong><\/p>\n\n\n\n

Research\n (including grow out tests in the greenhouse) is seeking to answer more \nof these questions prior to planting season, and we will keep you \nupdated as those results come in.  It should be noted<\/strong> that\n these issues are being seen in commercial seed that have been produced,\n handled and stored with great care.  Farmer saved seed <\/strong>are<\/strong> sometimes exposed to less than ideal conditions, and may have<\/strong> even more issues this season.<\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"

Below are words from Dr Bob Kemerait on the current peanut seed quality and seed quality situation\u00a0 We have received many questions in recent days pertaining to the quality issues facing our peanut seed supply in 2020 and relative performance of seed treatments Dynasty PD and Rancona.  Below is the information that you need to know […]<\/p>\n","protected":false},"author":67,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[9],"tags":[],"class_list":["post-2474","post","type-post","status-publish","format-standard","hentry","category-peanuts"],"_links":{"self":[{"href":"https:\/\/site.extension.uga.edu\/colquittag\/wp-json\/wp\/v2\/posts\/2474","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/site.extension.uga.edu\/colquittag\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/site.extension.uga.edu\/colquittag\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/site.extension.uga.edu\/colquittag\/wp-json\/wp\/v2\/users\/67"}],"replies":[{"embeddable":true,"href":"https:\/\/site.extension.uga.edu\/colquittag\/wp-json\/wp\/v2\/comments?post=2474"}],"version-history":[{"count":1,"href":"https:\/\/site.extension.uga.edu\/colquittag\/wp-json\/wp\/v2\/posts\/2474\/revisions"}],"predecessor-version":[{"id":2475,"href":"https:\/\/site.extension.uga.edu\/colquittag\/wp-json\/wp\/v2\/posts\/2474\/revisions\/2475"}],"wp:attachment":[{"href":"https:\/\/site.extension.uga.edu\/colquittag\/wp-json\/wp\/v2\/media?parent=2474"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/site.extension.uga.edu\/colquittag\/wp-json\/wp\/v2\/categories?post=2474"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/site.extension.uga.edu\/colquittag\/wp-json\/wp\/v2\/tags?post=2474"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}