Fungicides - M.O.A. etc. (no product names) Flashcards
Topical mode of action is based on the toxins relationship with the _______.
plant
Biochemical mode of action is based on the toxins relationship with the _______.
fungus
What mode of action is based on the toxins relationship with the plant?
Topical MOA
What mode of action it based on the toxins relationship with the Fungus?
Biochemical
a Topical Mode of Action is classified as either a ______ or ______.
contact or penetrant
(outside or inside of the plant)
What is phytomobility
how the a.i. moves within the plant
what MOA does not penetrate the plant?
Contact Fungicides
these fungicides affect fungi at specific metabolic sites
Penetrant Fungicides
How does a Localized Penetrant work?
Absorbed into plant’s cuticle but doesnt move
This Fungicide gets into the plant and moves upward:
Acropetal Penetrant
How does a Acropetal Penetrant work?
It is absorbed into the plant and moves between the cells and into the xylem to move acropetally from the point of contact.
How does a Systemic Penetrant work?
It is absorbed into the cells and follows the transport of sugars into the phloem. it is translocated basipetally AND acropetally.
what is symplastic transport?
absorbing into the cells
what is apoplastic transport?
absorbed and moves between cells
according to Buckley, the only true systemic penetrant is:
Signature
This type of toxin usually kills fungus and might kill the plant:
Multi-site toxins
This type of toxin stops fungal growth, doesnt kill it or the plant.
Site specific toxin
This type of toxin has little chance of resistance.
Multi site toxin
this type of toxin has a high likelyhood of resistance
Site-specific toxin
what toxins are at a higher risk of resistance?
site specific toxins
if a fungus has Monogenic resistance…what does that mean?
is develops resistance quickly becuase it evolves and changes a single gene which allows it to resist the toxin.
If a fungus has Polygenic resistance…what does that mean?
It is harder for the fungus to build up resistance to a toxin becuase it has to evolve to change several genes to resist the toxin.
What is Cross Resistance?
when a fungus is resistant to all materials in the same chemical class
What is multiple resistance?
when a fungus is resistant to materials in several chemical classes.
What are FRAC codes?
they provide fungicide resistance management guidelines to prolong the effectiveness of the products youre using.
Resistance Management:
What are some keys to doing this?
- Roatate Materials with different target sites
- Use label specified rates and dilution
- Get good coverage
- Treat Preventively
- Dont rely on fungicides alone for control
When would you use a preventive rate of fungicides?
Apply before disesase
Lower rate
contact or penetrant
when would you use a curative rate for fungicides?
After disease is present
Higher Rates
what issues can arise from having uncompatible products in your tank?
- Physical
- foaming or sedimentation
- Chemical
- loss of toxicity
- alkaline hydrolysis
- Phytotoxicity
- some mixes can be toxic to the plant
What nozzles on the sprayer are the most effective?
Flat Fan
