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Quizzes > Quizzes for Business > Agriculture

Fungicide Knowledge Assessment Quiz: Test Yourself

Assess Your Understanding of Fungicide Practices

Difficulty: Moderate
Questions: 20
Learning OutcomesStudy Material
Colorful paper art depicting elements related to Fungicide Knowledge Assessment Quiz

Ready to deepen your understanding of fungicide science? This Fungicide Knowledge Assessment Quiz challenges agronomy students, plant pathologists, and crop protection professionals with essential questions on modes of action, application timing, and resistance management. It's crafted in the vein of a Training Knowledge Assessment Quiz to boost practical skills, and you can adjust every question freely in our editor. For a solid foundation, try the Basic Knowledge Assessment Quiz too. Explore more interactive quizzes and elevate your expertise today.

Which of the following is a contact fungicide that remains on the plant surface to prevent pathogen germination?
Captan
Propiconazole
Trifloxystrobin
Azoxystrobin
Contact fungicides act on the surface of plant tissues and do not penetrate. Captan is a widely used multi-site contact fungicide that prevents spore germination on leaf surfaces.
Which class of fungicides inhibits ergosterol biosynthesis in fungal cell membranes?
Succinate dehydrogenase inhibitors
Azoles
Strobilurins
Dithiocarbamates
Azole fungicides target the cytochrome P450 enzyme sterol 14α-demethylase, which is essential for ergosterol biosynthesis. This disrupts fungal cell membrane integrity.
What is the main characteristic of a systemic fungicide?
It kills pathogens only after harvest
It only remains on the leaf surface
It reflects UV radiation
It moves within plant tissues
Systemic fungicides are absorbed by plant tissues and translocated through xylem or phloem, protecting both treated and new growth. This internal movement distinguishes them from contact fungicides.
Which of the following has the least impact on fungicide efficacy?
Environmental conditions at application
Color of formulation packaging
Timing of application relative to infection
Quantity of active ingredient applied
Fungicide efficacy depends on application rate, timing, and environmental factors like temperature and humidity. The packaging color does not influence biological activity.
Who is responsible for reading and following the fungicide label to ensure safe application?
Applicator
Pest organisms
Soil microbes
Neighboring residents
The applicator must read and comply with all label instructions for dosage, protective equipment, and environmental precautions. This ensures safe and effective use.
QoI fungicides block which component of fungal metabolism?
Cell wall β-glucan synthesis
RNA polymerase activity
Mitochondrial respiration at cytochrome bc1 complex
Sterol biosynthesis
QoI (Quinone outside Inhibitor) fungicides inhibit electron transport at the cytochrome bc1 complex, disrupting ATP production in fungal mitochondria.
Which classification describes a fungicide that can inhibit fungal pathogens after infection has occurred?
Protective fungicide
Soil fumigant
Contact fungicide
Curative fungicide
Curative fungicides are absorbed by infected tissue and can arrest pathogen development after establishment. Protective fungicides only prevent initial infection.
Which additive is commonly used to improve rainfastness of foliar fungicide sprays?
Soil wetting agent
Surfactant adjuvant
Plant growth regulator
Nitrogen fertilizer
Surfactant adjuvants lower surface tension, improving spray coverage and adhesion. This enhances resistance to wash-off by rain.
Which fungicide class is known for persistence and high environmental half-life in soil?
Triazoles
SDHIs
Echinocandins
Organochlorines
Organochlorines, such as DDT, are highly persistent in the environment due to their chemical stability. Modern fungicide classes generally degrade more rapidly.
For controlling powdery mildew, which fungicide is an example of a demethylation inhibitor?
Cupric hydroxide
Mancozeb
Myclobutanil
Chlorothalonil
Myclobutanil is a demethylation inhibitor (DMI) that targets sterol biosynthesis in fungal cell membranes. It is widely used against powdery mildew.
If a label directs 2 grams of fungicide per liter of spray solution, how many grams are required to prepare 100 liters?
200 g
400 g
50 g
20 g
Preparing 100 liters at 2 g/L requires 2 g × 100 L = 200 grams of fungicide. Accurate measurement ensures correct dosage.
At which plant growth stage is fungicide application most effective for preventing early leaf infections?
Bud break
Leaf drop
Post-harvest senescence
Fruit maturity
Applying fungicides at bud break protects vulnerable new tissues before pathogens establish. Later stages are less effective for early infections.
Which resistance management practice reduces selection pressure for a single fungicide mode of action?
Applying the same fungicide repeatedly
Reducing spray interval below label recommendation
Alternating fungicides from different FRAC groups
Doubling application rates
Alternating fungicides with different modes of action (different FRAC codes) exposes pathogens to varied targets, slowing the development of resistance.
Which fungicide group is associated with a high risk of resistance development in pathogens?
QoI (strobilurin) fungicides
Botanical extracts
Multi-site fungicides
Biocontrol agents
QoI fungicides have a single-site mode of action that exerts strong selection pressure, leading to rapid resistance development in pathogen populations.
To minimize harm to pollinators, when should fungicides be applied?
On windy days
At night when bees are inactive
During peak flower bloom midday
Early morning when bees forage
Applying fungicides at night avoids peak pollinator activity and reduces the likelihood of direct spray or residue exposure to bees.
A fungicide label recommends 1.5 kg/ha in 600 L/ha spray volume. For a 2-hectare field, what is the concentration in grams per liter?
2.5 g/L
5 g/L
3.0 g/L
0.5 g/L
Total product = 1.5 kg/ha × 2 ha = 3 kg (3000 g). Total water = 600 L/ha × 2 ha = 1200 L. Concentration = 3000 g ÷ 1200 L = 2.5 g/L.
Which leaf trait primarily influences the uptake of systemic fungicides into plant tissue?
Stomatal opening
Cuticle thickness only
Leaf surface color
Leaf pubescence density
Stomatal openings provide a direct pathway for entry of systemic compounds into leaf interiors, greatly influencing uptake efficiency.
What combination of properties increases a fungicide's potential for leaching into groundwater?
Low water solubility and high soil adsorption
High molecular weight and high Koc
High water solubility and low soil adsorption
High volatility and strong UV absorption
High water solubility allows the chemical to dissolve easily, and low soil adsorption (low Koc) prevents binding to soil, increasing leaching risk.
Which resistance management approach involves using two fungicides with different modes of action in the same spray tank?
Mixture
Alternation
Mosaic
Sequence
Mixtures combine multiple active ingredients simultaneously, targeting pathogens at different biochemical sites and reducing the chance of resistant strains emerging.
According to the Fungicide Resistance Action Committee (FRAC), what is the mode of action group number for succinate dehydrogenase inhibitor (SDHI) fungicides?
3
7
11
1
FRAC assigns group 7 to SDHI fungicides, reflecting their specific target of mitochondrial succinate dehydrogenase in fungal respiration.
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Learning Outcomes

  1. Identify key classes and modes of action of common fungicides.
  2. Analyse the efficacy factors influencing fungicide performance.
  3. Evaluate safety protocols and environmental impacts of fungicides.
  4. Apply appropriate selection criteria for disease control scenarios.
  5. Demonstrate proper dosage calculations and application timing.
  6. Master resistance management strategies for sustainable use.

Cheat Sheet

  1. Major Classes of Fungicides - Dive into the primary fungicide families like Benzimidazoles, Strobilurins, Dicarboximides, DMIs, Phenylamides, and SDHIs, each targeting a distinct fungal process. Understanding these classes helps you plan effective rotations and delay resistance buildup. Keep your disease-control toolbox varied for maximum protection. Fungicide Resistance Management Guide
  2. Modes of Action - Learn how benzamidazoles disrupt fungal cell division while strobilurins block mitochondrial respiration and starve the pathogen of energy. This knowledge empowers you to mix and match products without overlapping action sites. Stay a step ahead of crafty fungi! Fungicide Resistance Management Guide
  3. Factors Influencing Efficacy - Recognize that timing, dosage, spray volume, and weather variables like rain or temperature swings can make or break control efforts. A perfectly timed spray under optimal conditions maximizes uptake and safeguards your crop. Chart the forecast and plan accordingly for peak performance. Fungicide Resistance Management Guide
  4. Safety Protocols - Always don your protective gear, from gloves to respirators, and meticulously follow label instructions to shield yourself and bystanders. Proper mixing, application, and equipment cleaning prevent accidental exposure and environmental drift. Safety first keeps your fields - and you - healthy and worry-free. Fungicide Resistance Management Guide
  5. Environmental Impact Assessment - Evaluate potential effects on beneficial insects, aquatic life, and soil microbes before application. Mindful product choice and buffer zones reduce runoff risks and protect non-target organisms. Your eco-friendly approach sustains both yield and the surrounding ecosystem. Fungicide Resistance Management Guide
  6. Selection Criteria - Choose fungicides based on the specific pathogen, crop species, and severity of the outbreak to hit the problem precisely. A tailored selection often means fewer applications and lower costs. Smart choices lead to healthier plants and happier wallets! Fungicide Resistance Management Guide
  7. Dosage Calculations - Master the formula Dosage = (Desired concentration × Total volume) / Active ingredient concentration to ensure accurate mixing. Correct measurements prevent under-application and costly overuse. Precision dosing maximizes efficacy while minimizing waste. Fungicide Resistance Management Guide
  8. Optimal Application Timing - Aim for preventive sprays or apply at early disease onset to nip infections in the bud. Late applications often fall short, letting pathogens spread. A well-timed spray is your secret weapon against outbreaks. Fungicide Resistance Management Guide
  9. Resistance Management Strategies - Rotate fungicides with different FRAC codes and incorporate cultural or biological controls to outsmart resistant strains. Diverse tactics reduce selective pressure on any one product. Keep pathogens guessing and your fields protected. General Guidelines for Managing Resistance
  10. FRAC Codes Reference - Stay updated on FRAC codes to identify fungicide groups and guide your rotation plans. Regular consultation of the latest listings ensures you're not unintentionally repeating modes of action. Knowledge of codes is your roadmap to sustainable disease control. Fungicide Groups & FRAC Codes
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