Ghantous, Katherine

Sandler, Hilary A.

English

ScholarWorks@UMass Amherst

University of Massachusetts AmherstScholarWorks@UMass AmherstCranberry Station Extension meetings Cranberry Station Outreach and Public ServiceActivities1-20152015 Update Mtg: Weed Research UpdateKatherine GhantousUMass Amherst, kghantou@umass.eduHilary A. SandlerUniversity of Massachusetts - Amherst, hsandler@umass.eduFollow this and additional works at: https://scholarworks.umass.edu/cranberry_extensionPart of the Agriculture Commons, and the Horticulture CommonsThis Article is brought to you for free and open access by the Cranberry Station Outreach and Public Service Activities at ScholarWorks@UMassAmherst. It has been accepted for inclusion in Cranberry Station Extension meetings by an authorized administrator of ScholarWorks@UMassAmherst. For more information, please contact scholarworks@library.umass.edu.Recommended CitationGhantous, Katherine and Sandler, Hilary A., "2015 Update Mtg: Weed Research Update" (2015). Cranberry Station Extension meetings.193.Retrieved from https://scholarworks.umass.edu/cranberry_extension/193Katie	  Ghantous	  and	  Hilary	  Sandler	  UMass	  Cranberry	  Station	  Most	  grower	  questions	  and	  complaints	  about:	  	   Poverty	  grass	   Poison	  Ivy	   Dodder	   Moss	   Grower	  report	  -­‐	  	  control	  of	  PI	  by	  spot	  treating	  patches	  with	  tank	  mix	  	  	   	  1.5	  oz	  Callisto	  	  	  	   	  1.5	  oz	  Poast	  	  	  	  	   	  1.5	  oz	  Crop	  	  oil	   Backpack	  sprayer	  	  –	  	  spray	  to	  wet	   4	  	  grower	  	  sites	  	  -­‐	  Large	  plots	  4	  x	  4	  m	  	  Gallon	  Water	  “Late”	  Treated	  mid-­‐June	  +	  early	  July	  	  Untreated	  “Early”	  Treated	  late	  May	  +	  mid-­‐June	  	  Treated	  2013	  +	  2014	  Treated	  2013	  Treated	  2013	  +	  2014	  Treated	  2013	  Only	   Only	  %	  PI	  Cover	  %	  Cranberry	  Cover	  Cranberry	  fruit	   0 m 0.5 m 1 m 1.5 m 2 m 0 m      0.5 m      1 m      1.5 m      2 m      	  “Early”	  	  Treated	  2013+2014	  “Early”	  Treated	  2013	  Only	  1.  Crop	  oil	  concentrate	  (COC)	  	  2.  Nonionic	  surfactant	  (NIS)	  3.  Poast	  +	  COC	  	  4.  Callisto	  	  +	  COC	  5.  Callisto	  +	  NIS	  	  6.  Callisto	  +	  Poast	  +	  NIS	  7.  Callisto	  +	  Poast	  +	  COC	  	  8.  Untreated	  	  	  *All	  herbicides	  and	  COC	  at	  1.5	  oz/gallon,	  NIS	  at	  0.25%	  v:v	  	    1	  m	  plots,	  treated	  "Early”	  late	  May	  +	  mid-­‐June	  	  B	  B	  B	   B	  A	  A	   A	  A	  %	   %	  Poison	  Ivy	  Cover	  100	  0	  50	  Callisto	  can	  enter	  plants	  by	  both	  foliage	  and	  roots	    Best	  mode	  of	  absorption	  may	  vary	  by	  weed	  species	  	  Chemigation	    8oz/acre	  delivered	  in	  400+	  gallons	  of	  water	    Dilute,	  available	  to	  plant	  roots	  as	  well	  as	  foliage	    Some	  studies	  show	  best	  for	  weed	  control	  (i.e.	  nutsedge)	  Spot	  treating	  at	  experimental	  rate	    8oz/acre	  delivered	  in	  5.3	  gallons	  of	  water	    Much	  more	  concentrated!	    Better	  foliar	  absorbtion	    Can	  prob	  use	  less	  with	  same	  results	  	    i.e.	  	  1	  oz/gal	  or	  even	  less,	  we	  plan	  to	  test	  lower	  rates	  in	  the	  future	  DO	  NOT	  EXCEED	  8oz	  per	  acre	  !!!!	  (max.	  2	  applications)	    If	  you	  chemigate	  8oz	  per	  acre	  2x,	  you	  can	  not	  also	  spot	  treat	    Chemigate	  2x	  	  OR	    Can	  chemigate	  1x,	  spot	  treat	  1x	  	  OR	    Can	  spot	  treat	  twice	  Callisto	  by	  chemigation	  for	  dodder	  (4oz	  or	  8oz/A	  rate)	    Most	  growers	  who	  have	  used	  Callisto	  for	  dodder	  control	  report	  no	  satisfactory	  control	  of	  dodder	  	    Typically,	  the	  dodder	  shows	  signs	  of	  whitening	  but	  then	  recovers	  Test	  the	  more	  concentrated	  tank	  mix	  on	  dodder	  patches	  1.  Callisto	  +	  Poast	  	  +	  COC	  (1.5oz	  	  each/gallon)	  	  2.  Callisto	  +	  COC	  (1.5oz	  each/gallon)	    Treatments	  	  1.  1x	  early	  -­‐	  prior	  to	  dodder	  flowering	  (7/7/14)	  2.  1x	  late	  –	  while	  dodder	  was	  flowering	  (7/29/14)	  3.  2x	  -­‐	  (7/7/14	  and	  3	  weeks	  later	  on	  7/29/14)	  	  4.  Untreated	  	  	    Dodder	  seeds	  and	  cranberry	  fruit	  were	  collected	  from	  a	  1	  ft2	  area	  within	  each	  plot	  on	  9/24/14	  A	  B	   B	   B	   B	  a	  b	  b	  0	  200	  400	  600	  800	  1000	  1200	  1400	  #	  of	  seeds	  Treatment	  Dodder	  Seeds	  	  Treated	  pre-­‐flowering	   Treated	  at	  flowering	  No	  differences	  in	  fruit	    Many	  growers	  report	  use	  of	  low	  rates	  (30-­‐40#/A)	  	    Some	  get	  good	  control…	    But	  many	  growers	  also	  report	  failed	  control!	    Can	  we	  improve	  control?	    Split	  applications	  (extend	  control)	    Dodder	  can	  germinate	  over	  long	  periods	  	  	  	  of	  time	    Increase	  rates	  Grower’s	  typical	  practice	    Single	  40#	  application	  based	  on	  scouting	    7-­‐10	  days	  after	  seedlings	  found	  	  1st	  Application	  -­‐	  May	  7,	  2014	    Grower	  applied	  40#	  to	  property	  	  2nd	  Application	  -­‐	  May	  21,	  2014	  	    Test	  strips	  	    +20	  #	  (total	  of	  60#)	    +40#	  (total	  of	  80#)	  	  	    Need	  to	  do	  more	  testing!	    More	  controlled	  study	    Single	  rates	  of	  40#,	  60#,	  and	  80#	    Those	  same	  rates	  split	    Replicated	  plots	  	    If	  you	  aren’t	  getting	  control	  at	  40#,	  increase	  your	  rate	  Testing	  impact	  of	  sanding	  before	  Casoron	  on	  dodder	  germination	    Casoron	  attaches	  to	  soil	  particles	    Without	  sanding,	  most	  dodder	  seeds	  are	  at	  or	  near	  surface	    After	  sanding,	  dodder	  seeds	  under	  sand	   Need	  to	  pass	  through	  sand	  to	  emerge	   May	  increase	  seedling	  contact	  with	  herbicide	  and	  improve	  control	  Variability	  in	  Casoron	  susceptibility	   Does	  dodder	  respond	  differently	  at	  different	  farms?	  	  	  Continued	  screening	  of	  unregistered	  herbicides	  for	  suitability	  in	  cranberry	   Dodder	   Other	  weeds	  	  Continued	  screening	  of	  moss	  control	  products	    Moss	  killer	  product	  –	  work	  to	  establish	  label	  recommendations	  and	  show	  crop	  safety	  	    Explore	  chemigation	  of	  iron	  sulfate	  (used	  in	  other	  cranberry	  regions)	  

2015 Update Mtg: Weed Research Update

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2015 Update Mtg: Weed Research Update

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