Test 2 Flashcards
What are three formulatoins of phenoxy herbicides
Salt
Amine
Ester
What formulation of salt is the least efficacious and provides poorest weed control
Salts
Generally what formulation provides the best weed control. Salt amine ester
Ester
Generally what formulation salt Easter amine has the least percuctents in soil and should only be used for burn down
Ester
Generally which formulation salt amine ester has greater vulitility and therefor greater potential for offsite injury
Ester is most vulitile
The phenoxide are small organic compounds that form negatively charged ions in the soil that are subject to leaching but leaching is minimized due to 3
Adsorbsoin in clay soils
Removal from soil by plants
Rapid microbial degradation
Which herbicide family within the group 4 herbicides is stable in straw and manure
Clopyaralid/ pyridines
What are stem in joint symptoms in cereal from group 4 herbicides 3
Layover
Splayed
Stunted
What are
What are 3 head injury symptoms in cereal from the group 4 herbicides
Short bent or branched
Sterile or multiple florets
Distorted awns
What are 4 stem injury symptoms in corn from group 4 herbicides
Shepherds crook
Twisting or bending of main stem
Lodging or gooseneckjng
Brittle snap
Under what conditions are corn injoury symptoms in corn from group 4 herbicides more likely to ocurr 6
Course textured soil
After heavy rain
Cold temperature
Large temperature fluctuations
Late application
Sensitive hybrids
descripe the injury sypmtoms to soybean leaves from the group 4 herbicides 4
turtle backing
leaf staping
cobra head
leaf cupping
three benifits of the xtend and enlist crops are
some anual broadleave
perenial broadleaf
round up resistence crops
one of the concerns of using rr2 xtend soybeans and enlist crops is injury to sensitive crops due to 4
tank contamination
drift
volitilation
temperrature invertion
define volatile
something that evaperates redily at normal temps annd presure it changes from a liqued to a gas
when does 90 percent of offsite movement due to volitilation with dicamba occur
within first 24 hours
what was the first herbicide resistent weed where when
milton ontario, 1957, wild carrot
what are two herbicide families that belong to the group 5 herbicides
atrazine and metribuzin
which crop is aatrex used for
broadleaf in corn
what crop is suncor used for weed control in
broadleaf in soybeans
what are 4 preformulated mixtures of atrizine that can be used in corn
markman
converge
primextra
acuron
what are 7 premixes that can be used for soybeans
conopy pro
bifectu
fierce
conquest
bounty
triactor
commenza
when can atrazine be applied in corn 4
PP
PPI
POST
Pre
when can sencore be applied to soybeans 3
PP PPI pre
when group 5 herbicides are applied PP PPI Pre
roots
when group 5 herbicides are aplpied POST
foilage
how are group 5 herb translocated
apoplasticaly
where do group 5 herbicides accumilate in the plant
leafs margins and leaf tips
what is the mode of action of the triazines
photosynesis inhibitor
what are two classifacations of the photosynthesis inhibitor
classical
fast acting
what is the selectivity of the group 5 herbicides
differential metabolism
which group of weeds do the group 5 control
anual broadleaf weeds
what are two common annual broadleaf weeds that atrazine is week on
velvet leaf and ragweed
what are three common weeds that sencor is weak on
eastern black nightshade
cv
velvet leaf
common ragweed
what are 4 factors that incluence the lenght of residueal control
rate apllied
weather
soil type
time of application
what is the effect of weed control when group 5 is tankwixed with glyphosate
antagonism
what are two corn injury symptoms from atrozine
intervienal chlorosis
yellowing at leaf tips and margingd
how would you describe group 5 damage to soybeans
intervienal chlorosis
which leaves show group 5 injury first with soybeans
older leaves
what are 4 casuses of soybean injury from sencor
soil charachteristics
aplication timeing
weather
sensitive cultuvar
the degridation of atrozine is influenced by 3
soil om
weather
previus herbiside used
under what conditoins would you expect greater carryover with atrazine 5
dry weather
sandy soils
high ph soils
post application
max lable rate
how many group 5 resistent weeds are there
11
when are the group 6 herbasides applied
Post
are the group 6 contact or systemic
contact
which group of weeds do group control
anual broadleave weeds
what are two classifacations of the phoyosynthesis inhibitors
clasical and fast acting
what are three charachteristics of the fast acting
plant death is more rapid
little residue control
sharp responce curve
what mode of action is a group 6 herbicide
photosynthesis inhibitor
what are threee basis of selectivity in group 6
differential interceptoin
‘’ adsorbsion
‘’ metabolism
which crop is pardner used on
corn
which crop is buctril m used on
cereals wheat
which crop is infinity used on 2
barly wheat
when should pardner be applied to corn
4-8 leaf stage
when should buctril m be applied to cereals
2 leaf to flag
why does the application of parder need to be delayed to v2 stage in corn
becouse cutical needs to form
what are two weeds that buctril m provides beter control ofthan parder
pigweed
musterd
what are three weed species that bromoxynill has excelent activity on
buckwheat
grounsel
lambsquarter
what common weed is bromoxilnyl weak on
pigweed
what three weeds does infinity have better coverage of than buctril m
cickweed cleavers
canada fleabane
does pardner have any residule activity in the soil
none
describe the injury symptoms og pardner in corn 2
chlorosis
leaf burn
describe the injury symptoms of parner in sybeans 2
chlorosis
new growth not evident
what are two weeds that are resistent to group 6 herbisides
rodroot piweed
smooth pigweed
