5 Reasons Systemic Fungicides Need Efficacy Testing to Demonstrate Their Effectiveness
Plant diseases caused by fungi can reduce crop quality and productivity when they are not properly controlled. One product commonly used in plant protection is a systemic fungicides.
Unlike contact fungicides that primarily act on plant surfaces, systemic active ingredients can be absorbed into plant tissues and move within the plant to varying degrees depending on their physicochemical characteristics. However, the presence of an active ingredient in a formulation alone does not demonstrate that a product will effectively control a particular plant disease.
Concentration, formulation, application rate, target pathogen, host plant, and testing conditions can all influence performance. Therefore, systemic fungicides efficacy testing is important for generating measurable data to evaluate product performance against target organisms.
Why is this testing important?
Table of Content:
- Demonstrate Effectiveness Against the Target Pathogen
- Evaluate Performance at the Intended Application Rate
- Assess How Formulation Influences Product Performance
- Understand Product Performance Under Different Testing Conditions
- Support Efficacy Claims with Scientific Data
Demonstrate Effectiveness Against the Target Pathogen
Plant diseases can be caused by pathogens with different biological characteristics. A product that shows activity against one fungal species may not necessarily provide the same level of control against another.
Through efficacy testing, the performance of a systemic fungicides can be evaluated against a defined target pathogen using predetermined experimental parameters and conditions. Observations may include disease development, disease severity, or other parameters relevant to the study objective.
Therefore, product effectiveness can be evaluated using experimental data rather than relying solely on the known properties of its active ingredient.
Read Also:
How Systemic Fungicides Work: Mechanism, Formula, and Applications
Evaluate Performance at the Intended Application Rate
Application rate is an important factor in fungicide use. A rate that is too low may provide inadequate disease control, while inappropriate application may increase chemical use without providing a proportional benefit.
For this reason, a systemic fungicides can be evaluated at selected concentrations or application rates according to the experimental design. Testing multiple rates may also provide information about the relationship between product concentration and the response of the target organism.
These data can support formulation development and product-performance evaluation.
Assess How Formulation Influences Product Performance
The active ingredient is not the only factor affecting product performance. Formulation may influence application characteristics, deposition on plant surfaces, availability for absorption, and subsequent effects on the target organism.
Two products containing similar active ingredients may not necessarily perform identically if their formulations, concentrations, or application methods differ. Through systemic fungicides efficacy testing, manufacturers can obtain data on how a particular formulation performs under defined experimental conditions.
These results can support product development and formulation evaluation.
Understand Product Performance Under Different Testing Conditions
Fungicide efficacy can be influenced by environmental and biological factors. Host species, disease pressure, plant growth stage, temperature, humidity, and application timing may all affect disease-control outcomes.
Therefore, laboratory or controlled-condition results should always be interpreted within the context of the conditions under which the study was conducted. Testing a systemic fungicides using an appropriate experimental design provides information about product performance under defined conditions.
When necessary, further greenhouse or field studies can be conducted to evaluate performance under conditions that more closely represent actual use.
Support Efficacy Claims with Scientific Data
Claims regarding a product's ability to control plant diseases should be supported by measurable evidence. Efficacy studies allow researchers to compare treated groups with appropriate controls using predetermined response parameters.
The resulting data can then be analyzed to evaluate how a systemic fungicides affects the target organism under the specified experimental conditions. This provides manufacturers with a stronger scientific basis for evaluating product performance than relying solely on active-ingredient composition or formulation assumptions.
What Should Be Considered in Systemic Fungicide Efficacy Testing?
An efficacy study should be designed according to the research objective and product characteristics. Important considerations may include target-pathogen identity, host plant, treatment concentration or application rate, application method, control groups, replication, observation period, and response parameters.
The mode of action of the active ingredient should also be considered. Different systemic fungicides may differ in their biochemical targets and movement within plants. Therefore, testing methods should be selected according to the characteristics of the product and target organism.
Efficacy testing should also be distinguished from active-ingredient content analysis. Chemical testing determines the amount of a compound present in a formulation, while efficacy testing evaluates the biological effect of a product against a target organism under defined testing conditions.
Demonstrate Systemic Fungicides Performance Through Efficacy Testing
Active-ingredient content alone does not fully describe product performance. A systemic fungicide should be evaluated using an appropriate method to determine its effectiveness against the target pathogen under defined testing conditions.
Through Efficacy Testing at IML Testing & Research, manufacturers can evaluate product performance using study designs tailored to the research objective, target organism, and relevant response parameters.
Contact IML Testing & Research to discuss systemic fungicide efficacy testing and support your product's efficacy claims with measurable testing data.
Author & Editor: Lina
References
Agrios, G. N. (2005). Plant Pathology. 5th ed. Elsevier Academic Press.
Hewitt, H. G. (1998). Fungicides in Crop Protection. CAB International.
Matthews, G. A. (2006). Pesticides: Health, Safety and the Environment. Blackwell Publishing.
Krämer, W., Schirmer, U., Jeschke, P., & Witschel, M. (Eds.). (2012). Modern Crop Protection Compounds. 2nd ed. Wiley-VCH.
Brent, K. J., & Hollomon, D. W. (2007). Fungicide Resistance in Crop Pathogens: How Can It Be Managed? 2nd ed. Fungicide Resistance Action Committee.
Lucas, J. A. (2020). Plant Pathology and Plant Pathogens. 4th ed. Wiley-Blackwell.
Oliver, R. P., & Hewitt, H. G. (2014). Fungicides in Crop Protection. 2nd ed. CABI.
