Lecture 16 Flashcards
what do group 11’s inhibit?
cerotenoid biosynthesis
groups 11,12, 13, and 27 are all…
carotenoid biosynthesis inhibitors
‘bleaching herbicides’
group 11 herbicide
Amitrole - no loner manufactured
what do group 13’s inhibit?
DOXP - enzyme the is key to plastid synthesis
- bleaching and stunting
group 13 herbicide
Clomazone
Clomazone (13) application and uptake
soil applied
readily absorbed in roots
Clamazone (13) persistence
rapid degradation
can persist under extremely dry conditions
Clomazone (13) resistance(found or not?)
no host resistant biotypes reported
Clomazone (13) symptoms
seedlings emerge bur are bleached and become necrotic
what does group 14’s inhibit?
PPO
group 14 selectivity
suppression of broadleaves, some grasses
group 14 uptake
rapid uptake by leaves
are group 14’s subject to photodegradaton?
yes
group 14 herbicides
sulfentrazone - Triazolinones
Safulfenacil - Pyrimidinediones
Flumioxazin - N-Phenylpthalimides
group 14 MOA’s
inhibit heme and vhlorophyll synthesis
leads to loss of chlorophyll and carotenoids producing ‘leaky’ membranes
group 14 symptoms
appear rapidly
water soaked appearance
leaves yellowed and desiccated in 1-3 days
group 14 selectivity
rapid metabolism into inactive compounds
group 14 persistance
rapid breakdown (microbial)
Triallate (15) application
soil applied
does triallate affect monocots or dicots?
monocots only
Triallate target site
fatty acid synthesis
triallate MOA
inhibits cell elongation and division
triallate symptoms
shoestringing in grassy weeds
failure to emerge
do group 15’s affect seeds or shoot?
effect on shoot formation
