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crop diagnostics > Test 2 > Flashcards

Test 2 Flashcards

1
Q

What are three formulatoins of phenoxy herbicides

A

Salt
Amine
Ester

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2
Q

What formulation of salt is the least efficacious and provides poorest weed control

A

Salts

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3
Q

Generally what formulation provides the best weed control. Salt amine ester

A

Ester

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4
Q

Generally what formulation salt Easter amine has the least percuctents in soil and should only be used for burn down

A

Ester

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5
Q

Generally which formulation salt amine ester has greater vulitility and therefor greater potential for offsite injury

A

Ester is most vulitile

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6
Q

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

A

Adsorbsoin in clay soils
Removal from soil by plants
Rapid microbial degradation

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7
Q

Which herbicide family within the group 4 herbicides is stable in straw and manure

A

Clopyaralid/ pyridines

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8
Q

What are stem in joint symptoms in cereal from group 4 herbicides 3

A

Layover
Splayed
Stunted

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9
Q

What are

A
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10
Q

What are 3 head injury symptoms in cereal from the group 4 herbicides

A

Short bent or branched
Sterile or multiple florets
Distorted awns

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11
Q

What are 4 stem injury symptoms in corn from group 4 herbicides

A

Shepherds crook
Twisting or bending of main stem
Lodging or gooseneckjng
Brittle snap

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12
Q

Under what conditions are corn injoury symptoms in corn from group 4 herbicides more likely to ocurr 6

A

Course textured soil
After heavy rain
Cold temperature
Large temperature fluctuations
Late application
Sensitive hybrids

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13
Q

descripe the injury sypmtoms to soybean leaves from the group 4 herbicides 4

A

turtle backing
leaf staping
cobra head
leaf cupping

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14
Q

three benifits of the xtend and enlist crops are

A

some anual broadleave
perenial broadleaf
round up resistence crops

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15
Q

one of the concerns of using rr2 xtend soybeans and enlist crops is injury to sensitive crops due to 4

A

tank contamination
drift
volitilation
temperrature invertion

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16
Q

define volatile

A

something that evaperates redily at normal temps annd presure it changes from a liqued to a gas

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17
Q

when does 90 percent of offsite movement due to volitilation with dicamba occur

A

within first 24 hours

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18
Q

what was the first herbicide resistent weed where when

A

milton ontario, 1957, wild carrot

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19
Q

what are two herbicide families that belong to the group 5 herbicides

A

atrazine and metribuzin

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20
Q

which crop is aatrex used for

A

broadleaf in corn

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21
Q

what crop is suncor used for weed control in

A

broadleaf in soybeans

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22
Q

what are 4 preformulated mixtures of atrizine that can be used in corn

A

markman
converge
primextra
acuron

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23
Q

what are 7 premixes that can be used for soybeans

A

conopy pro
bifectu
fierce
conquest
bounty
triactor
commenza

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24
Q

when can atrazine be applied in corn 4

A

PP
PPI
POST
Pre

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25
Q

when can sencore be applied to soybeans 3

A

PP PPI pre

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26
Q

when group 5 herbicides are applied PP PPI Pre

A

roots

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27
Q

when group 5 herbicides are aplpied POST

A

foilage

28
Q

how are group 5 herb translocated

A

apoplasticaly

29
Q

where do group 5 herbicides accumilate in the plant

A

leafs margins and leaf tips

30
Q

what is the mode of action of the triazines

A

photosynesis inhibitor

31
Q

what are two classifacations of the photosynthesis inhibitor

A

classical
fast acting

32
Q

what is the selectivity of the group 5 herbicides

A

differential metabolism

33
Q

which group of weeds do the group 5 control

A

anual broadleaf weeds

34
Q

what are two common annual broadleaf weeds that atrazine is week on

A

velvet leaf and ragweed

35
Q

what are three common weeds that sencor is weak on

A

eastern black nightshade
cv
velvet leaf
common ragweed

36
Q

what are 4 factors that incluence the lenght of residueal control

A

rate apllied
weather
soil type
time of application

37
Q

what is the effect of weed control when group 5 is tankwixed with glyphosate

A

antagonism

38
Q

what are two corn injury symptoms from atrozine

A

intervienal chlorosis
yellowing at leaf tips and margingd

39
Q

how would you describe group 5 damage to soybeans

A

intervienal chlorosis

40
Q

which leaves show group 5 injury first with soybeans

A

older leaves

41
Q

what are 4 casuses of soybean injury from sencor

A

soil charachteristics
aplication timeing
weather
sensitive cultuvar

42
Q

the degridation of atrozine is influenced by 3

A

soil om
weather
previus herbiside used

43
Q

under what conditoins would you expect greater carryover with atrazine 5

A

dry weather
sandy soils
high ph soils
post application
max lable rate

44
Q

how many group 5 resistent weeds are there

A

11

45
Q

when are the group 6 herbasides applied

A

Post

46
Q

are the group 6 contact or systemic

A

contact

47
Q

which group of weeds do group control

A

anual broadleave weeds

48
Q

what are two classifacations of the phoyosynthesis inhibitors

A

clasical and fast acting

49
Q

what are three charachteristics of the fast acting

A

plant death is more rapid
little residue control
sharp responce curve

50
Q

what mode of action is a group 6 herbicide

A

photosynthesis inhibitor

51
Q

what are threee basis of selectivity in group 6

A

differential interceptoin
‘’ adsorbsion
‘’ metabolism

52
Q

which crop is pardner used on

A

corn

53
Q

which crop is buctril m used on

A

cereals wheat

54
Q

which crop is infinity used on 2

A

barly wheat

55
Q

when should pardner be applied to corn

A

4-8 leaf stage

56
Q

when should buctril m be applied to cereals

A

2 leaf to flag

57
Q

why does the application of parder need to be delayed to v2 stage in corn

A

becouse cutical needs to form

58
Q

what are two weeds that buctril m provides beter control ofthan parder

A

pigweed
musterd

59
Q

what are three weed species that bromoxynill has excelent activity on

A

buckwheat
grounsel
lambsquarter

60
Q

what common weed is bromoxilnyl weak on

A

pigweed

61
Q

what three weeds does infinity have better coverage of than buctril m

A

cickweed cleavers
canada fleabane

62
Q

does pardner have any residule activity in the soil

A

none

63
Q

describe the injury symptoms og pardner in corn 2

A

chlorosis
leaf burn

64
Q

describe the injury symptoms of parner in sybeans 2

A

chlorosis
new growth not evident

65
Q

what are two weeds that are resistent to group 6 herbisides

A

rodroot piweed
smooth pigweed

crop diagnostics (5 decks)

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