goal residues and implications for carryovercemonterey.ucanr.edu/files/85374.pdfbackground on goal...
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![Page 1: Goal Residues and Implications for Carryovercemonterey.ucanr.edu/files/85374.pdfBackground on Goal • Goal 2XL and Goal Tender (4F) • It is a diphenylether • It is a protox inhibitor](https://reader036.vdocuments.mx/reader036/viewer/2022090603/60570996c5442901756aac90/html5/thumbnails/1.jpg)
Goal Residues and Implications Goal Residues and Implications for Carryoverfor Carryover
Richard Smith, Farm AdvisorRichard Smith, Farm AdvisorUniversity of California Cooperative ExtensionUniversity of California Cooperative ExtensionMonterey CountyMonterey County
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Background on GoalBackground on Goal•• Goal 2XL and Goal Tender (4F)Goal 2XL and Goal Tender (4F)•• It is a diphenylether It is a diphenylether •• It is a protox inhibitor that thereby It is a protox inhibitor that thereby
disrupts normal photosynthetic activitydisrupts normal photosynthetic activity•• This causes a chain reaction that This causes a chain reaction that
results in accumulation of free radical results in accumulation of free radical oxygens that cause lipid peroxidation oxygens that cause lipid peroxidation and membrane destruction and membrane destruction –– the end the end result is similar to paraquatresult is similar to paraquat
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Background on GoalBackground on Goal
Other herbicides used in this area with Other herbicides used in this area with the same mode of action include: the same mode of action include:
•• ChateauChateau•• SharkShark
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Registered UsesRegistered Uses
•• Pre transplant on cole crops and post Pre transplant on cole crops and post emergence on broccoli* and emergence on broccoli* and cauliflower*cauliflower*
•• Onions* Onions* –– post emergencepost emergence•• Perennial crop (i.e. Artichokes) Perennial crop (i.e. Artichokes) –– post post
directed directed •• Fallow beds prior to many cropsFallow beds prior to many crops
* Takes advantage of the waxy cuticle * Takes advantage of the waxy cuticle
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Background on GoalBackground on Goal•• It is readily absorbed by the leaves of It is readily absorbed by the leaves of
plants and rapid bleaching and plants and rapid bleaching and desiccation occur around the sites desiccation occur around the sites where the spray droplets were where the spray droplets were depositeddeposited
•• Necrosis occurs in 1Necrosis occurs in 1--2 days2 days•• Translocation in the plant is very Translocation in the plant is very
limitedlimited•• Little is absorbed by roots Little is absorbed by roots
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Behavior of Goal in SoilBehavior of Goal in Soil•• Strongly adsorbed to soil and not Strongly adsorbed to soil and not
readily desorbedreadily desorbed•• It is adsorbed by the clays and organic It is adsorbed by the clays and organic
mattermatter•• Its solubility in soil water is 0.1 ppm Its solubility in soil water is 0.1 ppm
(extremely insoluble)(extremely insoluble)•• Therefore does not leach or move Therefore does not leach or move
much in soil much in soil –– except for sandy soilexcept for sandy soil•• It acts by forming a barrier at the soil It acts by forming a barrier at the soil
surface surface
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Behavior of Goal in SoilBehavior of Goal in Soil
•• Degradation in soilDegradation in soil–– Photodegradation is an important means Photodegradation is an important means
of breakdownof breakdown–– Microbial degradation is slowMicrobial degradation is slow
•• PersistencePersistence–– Half life is 35 days (30Half life is 35 days (30--40 days)40 days)
•• Will depend on the moisture and temperature Will depend on the moisture and temperature
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Behavior of Goal in SoilBehavior of Goal in Soil
•• Fallow Bed RatesFallow Bed Rates–– For lettuce and other leafy vegetablesFor lettuce and other leafy vegetables
•• 0.25 lb a.i./A (0.5 pint Goal Tender)0.25 lb a.i./A (0.5 pint Goal Tender) 90 days90 days•• 0.50 lb a.i./A (1.0 pint Goal Tender)0.50 lb a.i./A (1.0 pint Goal Tender) 120 days120 days
•• Prior to planting fallow beds need to be Prior to planting fallow beds need to be thoroughly worked to at least 2.5 thoroughly worked to at least 2.5 inchesinches
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Symptoms of Goal DamageSymptoms of Goal Damage•• The breakdown of Goal in the 90 The breakdown of Goal in the 90 –– 120 120
time frame can be incomplete, and if time frame can be incomplete, and if the beds are not thoroughly worked, the beds are not thoroughly worked, Goal can damage sensitive crop Goal can damage sensitive crop seedlingsseedlings
•• The breakdown of Goal residues can be The breakdown of Goal residues can be affected by the weatheraffected by the weather
•• Carry over issues are most frequently Carry over issues are most frequently seen on 80seen on 80--inch beds because they are inch beds because they are more difficult to adequately work more difficult to adequately work sufficientlysufficiently
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Middle of the bed is Middle of the bed is more difficult to more difficult to thoroughly workthoroughly workand can have and can have more Issues with more Issues with carryovercarryover
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Symptoms of Goal Carry Over on Symptoms of Goal Carry Over on SeedlingsSeedlings
•• Symptoms include stunting of the Symptoms include stunting of the seedlings, leaf distortion, necrotic seedlings, leaf distortion, necrotic spots, curling and cupping of the spots, curling and cupping of the leaves and burning of the hypocotyle at leaves and burning of the hypocotyle at the soil linethe soil line
•• Interestingly, even though the soil may Interestingly, even though the soil may have Goal residues, we have not seen have Goal residues, we have not seen Goal symptoms on the rootsGoal symptoms on the roots
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Goal Damage on Lettuce Goal Damage on Lettuce SeedlingsSeedlings
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No DamageNo Damage
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No DamageNo Damage
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Slight DamageSlight Damage
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Slight DamageSlight Damage
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Increasing DamageIncreasing Damage
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Severe DamageSevere Damage
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Puckered and deformed Puckered and deformed lower leaves with somelower leaves with some
necrosisnecrosis
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Close up of underside ofClose up of underside ofCrinkled leafCrinkled leaf
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Size range of affected seedlings:Size range of affected seedlings:
Normal Normal moderate severe moderate severe
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Goal Damage on Spinach
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RoNeet DamageRoNeet Damage Goal DamageGoal Damage
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Problems with Carry OverProblems with Carry Over
•• It is possible that in some years there It is possible that in some years there may be more carry over from fallow bed may be more carry over from fallow bed use due to low moisture and use due to low moisture and temperature conditions the prior wintertemperature conditions the prior winter
•• The 2006The 2006--07 winter was cold (at least 07 winter was cold (at least for 2 weeks in January) and mostly dryfor 2 weeks in January) and mostly dry
•• This may have affected the normal rate This may have affected the normal rate of breakdown of this materialof breakdown of this material
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Problems with Carry OverProblems with Carry Over
•• As a result, in the spring of 2007 we As a result, in the spring of 2007 we saw more issues with carry over of saw more issues with carry over of GoalGoal
•• It was associated with 80It was associated with 80--inch beds, inch beds, but not exclusivelybut not exclusively
•• It also may have been associated with It also may have been associated with sandier soilssandier soils
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Scatterplot by Level Code
0.31
0.51
0.71
0.91
1.11
Col
_5
Col_1B G
Affected vs UnaffectedAffected vs Unaffected
oxyf
luor
fen
ppm
oxyf
luor
fen
ppm
Oxyfluorfen Concentrations in Soil 0Oxyfluorfen Concentrations in Soil 0--2 Inch Depth2 Inch Depth
0.41 ppm0.41 ppm0.61 ppm0.61 ppm
Affected Unaffected
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Scatterplot by Level Code
0.31
0.51
0.71
0.91
1.11
Col
_5
Col_1B G
Affected vs UnaffectedAffected vs Unaffected
oxyf
luor
fen
ppm
oxyf
luor
fen
ppm
Oxyfluorfen Concentrations in Soil 0Oxyfluorfen Concentrations in Soil 0--2 Inch Depth2 Inch Depth
0.41 ppm0.41 ppm0.61 ppm0.61 ppm
OutlierOutlier
Affected Unaffected
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Scatterplot by Level Code
0.31
0.51
0.71
0.91
1.11
Col
_5
Col_1B G
Affected vs UnaffectedAffected vs Unaffected
oxyf
luor
fen
ppm
oxyf
luor
fen
ppm
Oxyfluorfen Concentrations in Soil 0Oxyfluorfen Concentrations in Soil 0--2 Inch Depth2 Inch Depth
0.61 ppm0.61 ppm
0.35 ppm0.35 ppm
Affected Unaffected
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Scatterplot by Level Code
0.31
0.51
0.71
0.91
1.11
Col
_5
Col_1B G
Affected vs UnaffectedAffected vs Unaffected
oxyf
luor
fen
ppm
oxyf
luor
fen
ppm
Oxyfluorfen Concentrations in Soil 0Oxyfluorfen Concentrations in Soil 0--2 Inch Depth2 Inch Depth
0.61 ppm0.61 ppm
0.35 ppm0.35 ppm
Affected Unaffected
Ideally we would like to be able to establish a soil concentrationthreshold. In this instanceit might look like we wereonto somethingbut it did not turn out to be quite right
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•• The concentrations observed in this The concentrations observed in this example can be converted to pounds of example can be converted to pounds of active ingredient/Aactive ingredient/A–– Affected: 0.61 ppm = 0.40 lbs a.i./AAffected: 0.61 ppm = 0.40 lbs a.i./A–– Unaffected: 0.35 ppm = 0.23 lbs a.i./AUnaffected: 0.35 ppm = 0.23 lbs a.i./A
•• These are high levels, considering These are high levels, considering application rates vary from 0.25 to 0.50 application rates vary from 0.25 to 0.50 lb a.i./Alb a.i./A
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Substantial Damage Observed in thisSubstantial Damage Observed in thisInstance at: Instance at:
0.16 to 0.35 ppm 0.16 to 0.35 ppm (0.10 to 0.23 lbs a.i./A)(0.10 to 0.23 lbs a.i./A)
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Scatterplot by Level CodeC
ol_5
Col_1
0
0.2
0.4
0.6
0.8
1
1.2
B G
Affected vs UnaffectedAffected vs Unaffected
Oxyfluorfen Concentrations in Soil 2Oxyfluorfen Concentrations in Soil 2--6 Inch Depth6 Inch DepthO
xyflu
orfe
n pp
mO
xyflu
orfe
n pp
m
Affected Unaffected
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With With CharcoalCharcoal
WithoutWithoutCharcoalCharcoal
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What is the Take Home MessageWhat is the Take Home MessageFrom this Study From this Study
•• These examinations indicate that the These examinations indicate that the levels of Goal at the soil surface are the levels of Goal at the soil surface are the most important factormost important factor
•• We did not identify a threshold for soil We did not identify a threshold for soil concentrations below which there concentrations below which there would be no damagewould be no damage
•• Goal concentrations deeper down in Goal concentrations deeper down in the soil are not the issuethe soil are not the issue
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How to Avoid Issues with Goal How to Avoid Issues with Goal Carry Over Carry Over
•• The label stipulates the rate, days before The label stipulates the rate, days before planting and details about working the bedplanting and details about working the bed
•• Working and mixing the soil in the beds is Working and mixing the soil in the beds is key as it is critical to reduce the key as it is critical to reduce the concentration of this material on the soil concentration of this material on the soil surfacesurface
•• Exercise extra caution in cold, dry wintersExercise extra caution in cold, dry winters•• Exercise extra caution on 80 inch beds Exercise extra caution on 80 inch beds
and sandy/gravelly soilsand sandy/gravelly soils
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