Questions and Answers
What is the chemical associated with ACCase Inhibitors?
Which of the following herbicides are ALS Inhibitors?
What is a Microtubule Assembly Inhibitor?
Which group does 2,4-D belong to?
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What herbicide is categorized as a Photosynthesis Inhibitor (ps 2)?
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Which group does Glyphosate belong to?
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Identify the Glutamine Synthetase Inhibitor.
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What is the herbicide associated with Carotenoid Biosynthesis?
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Which group does Fomesafen belong to?
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Identify the Cell Division Inhibitors.
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What herbicide is known as a Cell Membrane Disruptor?
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Which of the following herbicides belongs to Group 27(28)?
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Study Notes
Herbicide Classification Overview
- Herbicides are categorized into different groups based on their mode of action and chemical structure.
ACCase Inhibitors (Group 1)
- Key herbicide: Fluazifop
- Target: Inhibit acetyl CoA carboxylase, affecting fatty acid synthesis in weeds.
ALS Inhibitors (Group 2)
- Key herbicides: Imazethapyr, Pursuit
- Function: Inhibit the acetolactate synthase enzyme, disrupting amino acid synthesis.
Microtubule Assembly Inhibitors (Group 3)
- Key herbicide: Pendimethalin
- Mechanism: Disrupts microtubule formation, affecting cell division and growth.
Synthetic Auxins (Growth Regulators, Group 4)
- Key herbicides: 2,4-D, Dicamba
- Function: Mimic natural auxins, causing uncontrolled growth in target plants.
Photosynthesis Inhibitors (Photosystem II, Group 5)
- Key herbicide: Atrazine
- Mechanism: Block photosynthesis by inhibiting the photosystem II pathway.
EPSP Synthetase Inhibitors (Group 9)
- Key herbicide: Glyphosate
- Function: Disrupts the shikimic acid pathway, crucial for synthesizing aromatic amino acids.
Glutamine Synthetase Inhibitors (Group 10)
- Key herbicide: Liberty (from Safer’s Formula)
- Mechanism: Inhibit the enzyme glutamine synthetase, disrupting nitrogen metabolism in plants.
Carotenoid Biosynthesis Inhibitors (Group 13)
- Key herbicide: Clomazone
- Function: Inhibit the synthesis of carotenoids, leading to plant bleaching and death.
PPO Inhibitors (Group 14)
- Key herbicide: Fomesafen
- Mechanism: Block protoporphyrinogen oxidase, causing cell membrane damage.
Cell Division Inhibitors (Group 15)
- Key herbicides: S-metolachlor, Dual
- Function: Disrupt the cell cycle by inhibiting the formation of mitotic spindle fibers.
Cell Membrane Disruptors (Group 22)
- Key herbicide: Paraquat
- Mechanism: Cause oxidative damage to membranes, leading to plant cell death.
4-HPPDs (Group 27/28)
- Key herbicides: Balance, Callisto
- Function: Inhibit 4-hydroxyphenylpyruvate dioxygenase in the biosynthesis of tyrosine, affecting protein synthesis.
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Description
Explore the various groups of herbicides categorized by their modes of action and chemical structures. This quiz delves into key herbicides from each group, their targets, and mechanisms. Test your knowledge of herbicide classifications and understand their impact on weed management.
