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- Active ingredient
- Application
- Water stewardship
- CPD Quiz
About the active
1. Mode of action
Propyzamide (Pronamide) is the common name for:
3,5-Dichloro-N-(1,1-dimethyl-2-propynyl)benzamide
Member of the amide or substituted amide chemical family (Sometimes referred to as benzamide family of chemistry)
Propyzamide acts by preventing plant cell division
It inhibits mitosis by binding to tubulin and preventing its assembly into microtubules
Herbicide Mode of Action Classification - Group K1
Primarily root uptake and upward translocation
1. Mode of action
Propyzamide (Pronamide) is the common name for: 3,5-Dichloro-N-(1,1-dimethyl-2-propynyl) benzamide.
It is a member of the amide or substituted amide chemical family (sometimes referred to as benzamide family of chemistry).
Propyzamide acts by preventing plant cell division. It inhibits mitosis by binding to tubulin and preventing its assembly into microtubules.
It has herbicide Mode of Action Classification - Group 3.
Primarily root uptake and upward translocation.
2. How it works
Propyzamide must move into the soil root zone for effective contact with plant roots.
Propyzamide is primarily translocated upwards in plants following root absorption.
By forming a chemical layer in the upper soil zone, propyzamide affects plants through root absorption (direct contact at germination and/or emergence).
Because of the length of soil persistence, soil activity may last up to three months.
Improved efficacy in frosty conditions
In frosty conditions and in response to frost heave, plants such as blackgrass may produce adventitious roots.
These rootlets absorb propyzamide from the surface layers of soil. Under these conditions, despite plants being well established and deeply rooted, excellent control can be achieved.
3. Target weeds
Weeds controlled:
Blackgrass, ryegrass, annual meadow-grass, barren brome, volunteer cereals, wild oats, common chickweed, black bindweed, black nightshade, fat-hen, knotgrass, redshank, small nettle, speedwell, forget-me-not.
Products, weeds controlled, crops
•Astrokerb (link to product page)
•Kerb Flo 500 (link to product page)
•Kerb Flo (link to product page)
3. Products and weeds controlled
Grass weeds: Blackgrass, ryegrass, annual meadow-grass, barren brome, volunteer cereals, wild oats.
Broad leaved weeds: Common chickweed, black bindweed, black nightshade, fat-hen, redshank, small nettle, speedwell, forget-me-not, knotgrass.
Right RATE, Right CONDITIONS, Right TIME
- Right RATE: Assess BG population and select appropriate dose rate.
- 750g ai/ha good control.
- 840g ai/ha gives more robust control especially in heavy blackgrass populations.
- Right CONDITIONS: Apply when soil temperatures are declining and there is sufficient moisture.
- Optimum temperature is 10ºC and declining at 30 cm of soil
- Adequate soil moisture is essential to move the chemical into the root zone of weeds
It is important to get a good residual layer for robust control.
It’s a balance – the conditions need to be right – but if you wait too long and the blackgrass plants are too big it can give poorer results.
Use Kerb Weather data to keep track of the best time to apply.
Right RATE
Assess black grass population and select appropriate dose rate.
750g ai/ha good control.
840g ai/ha gives more robust control especially in heavy blackgrass populations.
4. Symptoms
