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crop diagnostics > last test > Flashcards

last test Flashcards

1
Q

what is the archillies heal of the group 2

A

resistence

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2
Q

what is the mode of action of the group 2

A

amino acid inhibiter

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3
Q

what amino acid is not formed after application of group 2

A

branched chain amino acids

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4
Q

what are group 2 commonly reffered to as

A

channel blocker

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5
Q

the group 2 restrict root growth what does that affect the plant

A

reduced micronutrient uptake

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6
Q

what are three sulfonyl urea herbicides that produce grass control

A

accent option pinnical

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7
Q

what are 6 sulfonyl urea that provide exclucivly broadleaf control

A

classic
muster
peak
permit
pinnical
refine

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8
Q

what are three sulfonyl urea herbicides that provide little residuel weed control

A

accent
option
pinnical

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9
Q

what are three silfonyl urea that do prodice residual weed control

A

permit
classic
prism

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10
Q

generally when are sulfonyl urea applied

A

POST

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11
Q

how are sulfonyl urea herbicides translocated

A

appoplasticaly and symplasticalyl

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12
Q

what should be added to the spray tank to improve postemergence activity of most sulfonyl urea herbicides

A

adjuvant

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13
Q

what is the bassis of selectivity with thesulfonyl urea herbicides 3

A

differential metabolism
‘’ adsorbtion
‘’ translocation

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14
Q

the SU’sare rapidly degraded in the soil by 2

A

chemical hydrolics and microbial degridation

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15
Q

which SU provides the best control of wirestem muhly

A

option

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16
Q

which weeds do peak and permit control in corn

A

anual broadleaf weeds

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17
Q

in addition to annual broaodleaf weeds what are two other weeds that peak has activity on

A

wild carot and perenial sowthisle

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18
Q

describe the injury symtptoms of the SU in corn 7

A

discouloration
crinkled leafs
leaves dont unfold
stunded growth
delay in plant defvelopment
secondary tiller development
pinched ears

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19
Q

injury in corn from su is due to reduced metabolism what are 4 factors that increas this

A

fluctuating temps
warm temps
use of insectisides
sensitive hybrids

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20
Q

which weeds do pinnical and clasic primarly control in soybeans

A

broadleaf weeds

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21
Q

describe the 5 injury symptoms of SU in soybeans

A

yellow leaf margins
red purple veining
leaf crinkling
stunting
death of growing point

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22
Q

what are two weeds that refine sg is particularly effective on

A

chickweed and wild carrot

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23
Q

pursuit is absorbed by the 2

A

roots
foilage

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24
Q

what is the primary selectivity with pursuit

A

differential metabolism

25
Q

describe the 5 injury symptoms of pursuit on soybeans

A

yellow leaf margins
red purple viens
leaf crinkling
stunting
death of growing point

26
Q

where/when would you expect to see crop damage from pursuit the next planting year 5

A

low rainfall
high clay
low ph
high om
heavy rainfall previus years

27
Q

what group of weeds do broadstrike and firstrate control

A

anual broadleaf

28
Q

what plant structures absorb broadstrike and first rate

A

meristem

29
Q

what are three important broadleaf weeds that firstrare is weak on when applied post

A

lambsquarter
pigweeds
eastern black nightshade

30
Q

why is rainfall so important with soil aplied herbicides

A

so it is properly absorbed by the soil

31
Q

describe the injury symptoms of broadstrike and first rate on soybeans 5

A

narrow elongated stems
leaf crincling
chlorosis
stunting
reduced root growth

32
Q

what are five conditoins where the injury of broadstrike and firstrate will be increased

A

freezing temps
wet conditions
high soil moisture
high soil ph
low om

33
Q

how are broadstrike and firstrate broken down in the soil

A

microbial degridation

34
Q

what is the primary reason for group two resistence

A

altered target site

35
Q

what are two reasons herbisiced were developed during ww11

A

kill food crops
kill deciduous trees

36
Q

what group of weeds fo group 4 herbicides control

A

broadleafs

37
Q

what are two crops that group 4 is used on

A

cerials and corn

38
Q

why did farmers rapidly adopt phenoxy herb 5

A

low toxisity
low cost
low application rates
wide margin of crop saftey
exelent efficacy

39
Q

which herbicide 24d or mcpa is safe on cereals

A

mcpa

40
Q

where is mcpb mcpa used primarly

A

weed control in peas

41
Q

which herbiscide 24d or mcpa is safe in corn

A

24d

42
Q

where is 24d used primarly

A

seed control for alfalfa

43
Q

what are two trade names for dicamba

A

engenia
xtendamax

44
Q

ehat crop is engenia and xtendamax registered on

A

rr extend sobeans

45
Q

what two crops is enlist duo registered for use on

A

corn
e3soybeans

46
Q

generally what is the recomended application timeing for group 4

A

POST

47
Q

a fall aplication of the group 4 herbisides is very effective for the control of q

A

perenial broadleaf weeds

48
Q

the group 4 herbicide is adsorbed through the

A

foilage

49
Q

what is the primary way group 4 herb is translocated

A

symplasticaly

50
Q

where do the group 4 herb accumilate in the plant

A

meristem

51
Q

the group 4 cause a number of growth abnormalities name 5

A

increased cell elongation
twinsting stems
distorted leaf
deat of meristematic tissue
damage to the vascular system

52
Q

describe why alfalfa is tolerant to 24d

A

they dont convert it to a harmfull chemical

53
Q

what is the basis of selectivity with group 4 herbisides 4

A

differential metabolism
‘’ interception
‘’ adsorbtion
‘’ translocation

54
Q

what are 4 important weeds that the phenoxes are weak on

A

buckwheat
wild caroot
chickweed
fleabane

55
Q

what are 5 weeds that dicamba is weak on

A

canola
musterds
nightshade
velvet leaf
waterhemp

56
Q

under what condisoins would you expect good control of weeds with group 4 3

A

young
activly growing
good moisture

57
Q

the rate of a group 4 should be adjusted based on 2

A

weed species
weed size

58
Q

do the group 4 have good residual control

A

no very little

crop diagnostics (5 decks)

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