Loading
Agricultural disputes often turn on a difficult technical question: what caused a crop, field, orchard, vineyard, or farming operation to perform differently than expected? Weather, disease, pests, soil conditions, irrigation, chemical applications, equipment, and farming practices may produce similar symptoms or interact with one another.
Agricultural expert witnesses can help attorneys and claims professionals investigate competing explanations by analyzing farm records, field conditions, soil and plant data, weather history, chemical applications, crop-management practices, test results, and yield information.
This guide explains how agricultural experts evaluate crop loss and farming disputes, what evidence they may review, how competing causes may be analyzed, and what considerations can affect expert testimony and loss analysis.
Agricultural expertise may be useful when a claim involves specialized questions about crop production, plant health, soil, water, chemicals, equipment, or farm-management practices.
Examples include:
Crop failure or reduced-yield claims
Herbicide or pesticide drift
Fertilizer and nutrient disputes
Irrigation or drainage failures
Flood, drought, freeze, heat, or storm damage
Soil fertility, salinity, compaction, or contamination
Plant disease, insect, nematode, or weed damage
Seed, germination, or crop-establishment disputes
Agricultural equipment or application-system failures
Orchard, vineyard, nursery, and perennial-crop losses
Crop-insurance claims and loss-adjustment disputes
Agricultural contracts involving crop quantity or quality
The appropriate expert and methodology depend on the crop, alleged event, growing season, available evidence, and technical issue.
Agricultural expert witnesses analyze crop loss and farming disputes involving weather, soil, irrigation, chemicals, pests, disease, equipment, and management practices. This article explains evidence preservation, competing-cause analysis, crop-loss and insurance disputes, expert selection, damages analysis, and reliability requirements under Rule 702.
Causation Analysis
Laboratory Testing
Environmental Sampling
Climatology
Insurance Claims
Economic Analysis
Damages Calculations
Agricultural disputes often turn on a difficult technical question: what caused a crop, field, orchard, vineyard, or farming operation to perform differently than expected? Weather, disease, pests, soil conditions, irrigation, chemical applications, equipment, and farming practices may produce similar symptoms or interact with one another.
Agricultural expert witnesses can help attorneys and claims professionals investigate competing explanations by analyzing farm records, field conditions, soil and plant data, weather history, chemical applications, crop-management practices, test results, and yield information.
This guide explains how agricultural experts evaluate crop loss and farming disputes, what evidence they may review, how competing causes may be analyzed, and what considerations can affect expert testimony and loss analysis.
Agricultural expertise may be useful when a claim involves specialized questions about crop production, plant health, soil, water, chemicals, equipment, or farm-management practices.
Examples include:
Crop failure or reduced-yield claims
Herbicide or pesticide drift
Fertilizer and nutrient disputes
Irrigation or drainage failures
Flood, drought, freeze, heat, or storm damage
Soil fertility, salinity, compaction, or contamination
Plant disease, insect, nematode, or weed damage
Seed, germination, or crop-establishment disputes
Agricultural equipment or application-system failures
Orchard, vineyard, nursery, and perennial-crop losses
Crop-insurance claims and loss-adjustment disputes
Agricultural contracts involving crop quantity or quality
The appropriate expert and methodology depend on the crop, alleged event, growing season, available evidence, and technical issue.
An agricultural expert typically reconstructs conditions before, during, and after the alleged loss. Useful evidence may include:
Planting dates, acreage, crop varieties, and seeding rates
Historical yield and harvest records
Field scouting, pest, and disease records
Soil, water, and plant-tissue testing
Irrigation and drainage records
Fertilizer, pesticide, and herbicide applications
Product labels and application instructions
Equipment calibration, maintenance, and GPS data
Weather records
Field photographs, drone imagery, and maps
Laboratory reports
Harvest, sales, crop-insurance, contract, and farm-management records
Public data may supplement farm-specific records. For example, the United States Department of Agriculture National Agricultural Statistics Service Quick Stats database provides agricultural information by commodity, geography, and time period. These data can provide context, but regional statistics alone may not show what a particular farm would have produced.
Agricultural evidence can change quickly. Crops may grow or deteriorate, damaged plants may be removed, fields may be replanted, and weather may alter field conditions.
Counsel may consider preserving:
Date-stamped photographs and video
Drone or aerial imagery
Representative plant material
Soil and water samples
Field maps and GPS records
Product containers and applicable labels
Application and calibration records
Weather information
Irrigation and equipment records
Harvest and production documents
Sampling methods should match the technical question and the condition or substance being evaluated. For soil-health testing, NRCS guidance emphasizes well-planned, representative sampling and documentation of sampling locations and dates. Other investigations, including contamination or pesticide-residue matters, may require different sampling, handling, and preservation protocols.
Determining that a crop was damaged is different from determining why it was damaged. An investigation may compare the alleged cause with other explanations that could account for when, where, and how the damage developed.
The distribution of symptoms can provide important clues. An expert may examine whether damage:
Is uniform or limited to portions of a field
Follows soil, elevation, drainage, or irrigation patterns
Is concentrated near field boundaries
Follows an equipment or spray pattern
Differs by crop variety or planting date
Progresses in a pattern associated with disease or pests
An expert may also place planting, chemical applications, irrigation events, temperature extremes, storms, symptom development, and harvest results on a common timeline.
Historical weather information from the National Oceanic and Atmospheric Administration may help identify conditions during the relevant period. Weather-station observations should still be evaluated in relation to field location, crop growth stage, soil conditions, irrigation, and event duration.
Soil and water conditions may affect crop establishment, root development, nutrient availability, disease, and yield.
The United States Department of Agriculture Natural Resources Conservation Service Web Soil Survey provides soil-survey information that may help identify mapped soil characteristics. Site-specific inspection and testing may still be necessary when actual field conditions are disputed.
An irrigation-related investigation may examine water availability, scheduling, system performance, application rates, soil moisture, drainage, salinity, and crop water needs. Whether irrigation contributed to a particular loss requires case-specific analysis.
Plant symptoms do not necessarily identify a single cause. Disease, insects, nutrient deficiencies, herbicide injury, drought, flooding, and other environmental conditions can produce overlapping symptoms.
A plant pathologist, agronomist, entomologist, or other qualified specialist may consider:
Symptom development and field distribution
Crop variety and susceptibility
Field and disease history
Pest observations
Environmental conditions
Plant, root, soil, or tissue samples and laboratory findings
The American Phytopathological Society notes that laboratory testing may be necessary when symptoms and signs are insufficient to identify an infectious plant disease. Diagnosis may also require field history, symptom patterns, environmental conditions, and consideration of other possible explanations.
Chemical crop-injury disputes may require an expert to reconstruct what product was used, how it was applied, the conditions at the time of application, and whether the observed injury is consistent with the alleged exposure.
The United States Environmental Protection Agency defines pesticide spray drift as pesticide dust or droplets moving through the air during or shortly after application to an unintended location. EPA recognizes that drift can damage nearby crops and cause economic losses.
An expert may review:
Product formulation and labeling
Application rate, timing, equipment settings, and calibration
Wind and weather conditions
GPS or application maps
Crop-growth stage and field injury patterns
Tissue or residue testing
Other possible agricultural causes
Under the Federal Insecticide, Fungicide, and Rodenticide Act, federal law generally prohibits using a registered pesticide in a manner inconsistent with its labeling, subject to statutory exceptions.
States may impose additional or more restrictive requirements concerning pesticide sale or use, subject to federal limits. However, states may not impose labeling or packaging requirements that differ from or add to federal requirements.
Whether a particular application violated an applicable requirement, caused the claimed damage, or gives rise to liability is a separate case-specific determination.
Once the agricultural cause is investigated, the parties may also dispute the amount of production or economic value allegedly lost.
Depending on the claim and applicable measure of damages, a crop-loss analysis may consider:
Historical yields, unaffected acreage, or comparable crop blocks
Harvest records
Crop age, maturity, acreage, quality, or grade
Contracted or relevant market prices
Replanting, replacement, or other relevant costs
Salvage value, avoided costs, and mitigation efforts
Farm-specific production history may also be considered when estimating expected production, depending on the applicable damages framework. United States Department of Agriculture National Agricultural Statistics Service data may provide regional context, but broader averages should be evaluated alongside the available farm-specific evidence.
Different parts of the damages analysis may require different expertise. An agronomist may evaluate expected production, while an agricultural economist, accountant, or other financial professional may address monetary loss. The proper legal measure of damages depends on the jurisdiction, claims, contracts, and facts.
Crop-insurance disputes may involve both agricultural facts and specialized policy and procedural requirements. The United States Department of Agriculture Risk Management Agency publishes Federal Crop Insurance Corporation procedures, including crop-insurance handbooks and commodity-specific loss-adjustment standards that may vary by crop year.
Because applicable requirements can vary by crop, crop year, location, and insurance plan, counsel should identify the governing policy documents, including the applicable Basic Provisions, Crop Provisions, Special Provisions, endorsements or options, actuarial documents, and other applicable policy terms, as well as the controlling loss-adjustment procedures.
An agricultural expert may address factual questions involving:
Cause and timing of crop damage
Acreage affected
Remaining production
Field conditions
Agricultural practices
Production and yield records
Coverage and compliance questions may extend beyond the agricultural expert's technical role, although the expert's analysis may help address relevant factual issues.
There is no single agricultural discipline that fits every farming dispute. The expert's qualifications should correspond to the technical issue and opinions involved.
Potential disciplines include:
Agronomy: crop production, fertility, and yield
Plant pathology: crop diseases and pathogen diagnosis
Weed science or pesticide science: herbicide injury and chemical applications
Soil science: soil characteristics, fertility, and salinity
Agricultural engineering: irrigation, drainage, equipment, and application systems
Horticulture: orchards, vineyards, nurseries, and specialty crops
Entomology: insect-related crop damage
Agricultural economics: economic loss and agricultural financial analysis
Complex matters may require more than one specialty because crop-causation and financial-loss questions can require different expertise.
In federal proceedings governed by the Federal Rules of Evidence, agricultural expert testimony is subject to Federal Rule of Evidence 702. The witness must be qualified by knowledge, skill, experience, training, or education, and the proponent must demonstrate to the court that it is more likely than not that:
The expert's specialized knowledge will help the trier of fact understand the evidence or determine a fact in issue
The testimony is based on sufficient facts or data
The testimony is the product of reliable principles and methods
The opinion reflects a reliable application of those principles and methods to the facts
In applying Rule 702 to an agricultural opinion, courts may consider the quality of the farm and field data, the expert's inspection or testing, the methodology used, relevant alternative causes, assumptions and limitations, and how the evidence supports the opinion.
Practical agricultural experience may provide a basis for expert testimony. When experience is the primary basis for an opinion, the witness must connect that experience to the reasoning used, explain why it adequately supports the opinion, and show how it was applied reliably to the facts.
An expert's title or experience alone does not establish that every opinion satisfies Rule 702. State evidentiary rules may differ, so admissibility must be evaluated under the law governing the proceeding.
Agricultural disputes often involve several plausible explanations for the same crop or production problem. Qualified experts can help attorneys and claims professionals evaluate competing causes, assess relevant evidence and uncertainties, and analyze crop-loss and damages issues within the scope of their expertise.
What type of agricultural expert is needed for a crop loss case?
The appropriate discipline depends on the disputed cause and opinions at issue. Depending on the matter, relevant specialists may include agronomists, plant pathologists, soil scientists, agricultural engineers, entomologists, horticulturists, or agricultural economists.
How may an agricultural expert evaluate the cause of crop damage?
An expert may compare field patterns, timing, crop history, weather, soil and water conditions, management records, chemical applications, disease or pest evidence, and testing to assess which explanations fit the available evidence.
What records should attorneys obtain in a crop loss dispute?
Relevant records may include planting and harvest data, historical yields, chemical and irrigation records, testing, photographs, weather data, field maps, scouting records, equipment information, and financial documents. The most useful records depend on the disputed issues.
Can an agricultural expert assist with a crop-insurance claim?
Yes. Depending on the issue, an agricultural expert may analyze crop condition, cause and timing of loss, field practices, acreage, production, and supporting records. Policy interpretation and coverage may involve issues beyond the agricultural expert's technical role. The expert's findings may still help address relevant factual questions.
When should an agricultural expert inspect the field?
An early inspection may be important when crop or field conditions are likely to change. Whether immediate inspection, sampling, or other preservation is appropriate depends on the alleged loss, existing evidence, and disputed technical issues.
An agricultural expert typically reconstructs conditions before, during, and after the alleged loss. Useful evidence may include:
Planting dates, acreage, crop varieties, and seeding rates
Historical yield and harvest records
Field scouting, pest, and disease records
Soil, water, and plant-tissue testing
Irrigation and drainage records
Fertilizer, pesticide, and herbicide applications
Product labels and application instructions
Equipment calibration, maintenance, and GPS data
Weather records
Field photographs, drone imagery, and maps
Laboratory reports
Harvest, sales, crop-insurance, contract, and farm-management records
Public data may supplement farm-specific records. For example, the United States Department of Agriculture National Agricultural Statistics Service Quick Stats database provides agricultural information by commodity, geography, and time period. These data can provide context, but regional statistics alone may not show what a particular farm would have produced.
Agricultural evidence can change quickly. Crops may grow or deteriorate, damaged plants may be removed, fields may be replanted, and weather may alter field conditions.
Counsel may consider preserving:
Date-stamped photographs and video
Drone or aerial imagery
Representative plant material
Soil and water samples
Field maps and GPS records
Product containers and applicable labels
Application and calibration records
Weather information
Irrigation and equipment records
Harvest and production documents
Sampling methods should match the technical question and the condition or substance being evaluated. For soil-health testing, NRCS guidance emphasizes well-planned, representative sampling and documentation of sampling locations and dates. Other investigations, including contamination or pesticide-residue matters, may require different sampling, handling, and preservation protocols.
Determining that a crop was damaged is different from determining why it was damaged. An investigation may compare the alleged cause with other explanations that could account for when, where, and how the damage developed.
The distribution of symptoms can provide important clues. An expert may examine whether damage:
Is uniform or limited to portions of a field
Follows soil, elevation, drainage, or irrigation patterns
Is concentrated near field boundaries
Follows an equipment or spray pattern
Differs by crop variety or planting date
Progresses in a pattern associated with disease or pests
An expert may also place planting, chemical applications, irrigation events, temperature extremes, storms, symptom development, and harvest results on a common timeline.
Historical weather information from the National Oceanic and Atmospheric Administration may help identify conditions during the relevant period. Weather-station observations should still be evaluated in relation to field location, crop growth stage, soil conditions, irrigation, and event duration.
Soil and water conditions may affect crop establishment, root development, nutrient availability, disease, and yield.
The United States Department of Agriculture Natural Resources Conservation Service Web Soil Survey provides soil-survey information that may help identify mapped soil characteristics. Site-specific inspection and testing may still be necessary when actual field conditions are disputed.
An irrigation-related investigation may examine water availability, scheduling, system performance, application rates, soil moisture, drainage, salinity, and crop water needs. Whether irrigation contributed to a particular loss requires case-specific analysis.
Plant symptoms do not necessarily identify a single cause. Disease, insects, nutrient deficiencies, herbicide injury, drought, flooding, and other environmental conditions can produce overlapping symptoms.
A plant pathologist, agronomist, entomologist, or other qualified specialist may consider:
Symptom development and field distribution
Crop variety and susceptibility
Field and disease history
Pest observations
Environmental conditions
Plant, root, soil, or tissue samples and laboratory findings
The American Phytopathological Society notes that laboratory testing may be necessary when symptoms and signs are insufficient to identify an infectious plant disease. Diagnosis may also require field history, symptom patterns, environmental conditions, and consideration of other possible explanations.
Chemical crop-injury disputes may require an expert to reconstruct what product was used, how it was applied, the conditions at the time of application, and whether the observed injury is consistent with the alleged exposure.
The United States Environmental Protection Agency defines pesticide spray drift as pesticide dust or droplets moving through the air during or shortly after application to an unintended location. EPA recognizes that drift can damage nearby crops and cause economic losses.
An expert may review:
Product formulation and labeling
Application rate, timing, equipment settings, and calibration
Wind and weather conditions
GPS or application maps
Crop-growth stage and field injury patterns
Tissue or residue testing
Other possible agricultural causes
Under the Federal Insecticide, Fungicide, and Rodenticide Act, federal law generally prohibits using a registered pesticide in a manner inconsistent with its labeling, subject to statutory exceptions.
States may impose additional or more restrictive requirements concerning pesticide sale or use, subject to federal limits. However, states may not impose labeling or packaging requirements that differ from or add to federal requirements.
Whether a particular application violated an applicable requirement, caused the claimed damage, or gives rise to liability is a separate case-specific determination.
Once the agricultural cause is investigated, the parties may also dispute the amount of production or economic value allegedly lost.
Depending on the claim and applicable measure of damages, a crop-loss analysis may consider:
Historical yields, unaffected acreage, or comparable crop blocks
Harvest records
Crop age, maturity, acreage, quality, or grade
Contracted or relevant market prices
Replanting, replacement, or other relevant costs
Salvage value, avoided costs, and mitigation efforts
Farm-specific production history may also be considered when estimating expected production, depending on the applicable damages framework. United States Department of Agriculture National Agricultural Statistics Service data may provide regional context, but broader averages should be evaluated alongside the available farm-specific evidence.
Different parts of the damages analysis may require different expertise. An agronomist may evaluate expected production, while an agricultural economist, accountant, or other financial professional may address monetary loss. The proper legal measure of damages depends on the jurisdiction, claims, contracts, and facts.
Crop-insurance disputes may involve both agricultural facts and specialized policy and procedural requirements. The United States Department of Agriculture Risk Management Agency publishes Federal Crop Insurance Corporation procedures, including crop-insurance handbooks and commodity-specific loss-adjustment standards that may vary by crop year.
Because applicable requirements can vary by crop, crop year, location, and insurance plan, counsel should identify the governing policy documents, including the applicable Basic Provisions, Crop Provisions, Special Provisions, endorsements or options, actuarial documents, and other applicable policy terms, as well as the controlling loss-adjustment procedures.
An agricultural expert may address factual questions involving:
Cause and timing of crop damage
Acreage affected
Remaining production
Field conditions
Agricultural practices
Production and yield records
Coverage and compliance questions may extend beyond the agricultural expert's technical role, although the expert's analysis may help address relevant factual issues.
There is no single agricultural discipline that fits every farming dispute. The expert's qualifications should correspond to the technical issue and opinions involved.
Potential disciplines include:
Agronomy: crop production, fertility, and yield
Plant pathology: crop diseases and pathogen diagnosis
Weed science or pesticide science: herbicide injury and chemical applications
Soil science: soil characteristics, fertility, and salinity
Agricultural engineering: irrigation, drainage, equipment, and application systems
Horticulture: orchards, vineyards, nurseries, and specialty crops
Entomology: insect-related crop damage
Agricultural economics: economic loss and agricultural financial analysis
Complex matters may require more than one specialty because crop-causation and financial-loss questions can require different expertise.
In federal proceedings governed by the Federal Rules of Evidence, agricultural expert testimony is subject to Federal Rule of Evidence 702. The witness must be qualified by knowledge, skill, experience, training, or education, and the proponent must demonstrate to the court that it is more likely than not that:
The expert's specialized knowledge will help the trier of fact understand the evidence or determine a fact in issue
The testimony is based on sufficient facts or data
The testimony is the product of reliable principles and methods
The opinion reflects a reliable application of those principles and methods to the facts
In applying Rule 702 to an agricultural opinion, courts may consider the quality of the farm and field data, the expert's inspection or testing, the methodology used, relevant alternative causes, assumptions and limitations, and how the evidence supports the opinion.
Practical agricultural experience may provide a basis for expert testimony. When experience is the primary basis for an opinion, the witness must connect that experience to the reasoning used, explain why it adequately supports the opinion, and show how it was applied reliably to the facts.
An expert's title or experience alone does not establish that every opinion satisfies Rule 702. State evidentiary rules may differ, so admissibility must be evaluated under the law governing the proceeding.
Agricultural disputes often involve several plausible explanations for the same crop or production problem. Qualified experts can help attorneys and claims professionals evaluate competing causes, assess relevant evidence and uncertainties, and analyze crop-loss and damages issues within the scope of their expertise.
What type of agricultural expert is needed for a crop loss case?
The appropriate discipline depends on the disputed cause and opinions at issue. Depending on the matter, relevant specialists may include agronomists, plant pathologists, soil scientists, agricultural engineers, entomologists, horticulturists, or agricultural economists.
How may an agricultural expert evaluate the cause of crop damage?
An expert may compare field patterns, timing, crop history, weather, soil and water conditions, management records, chemical applications, disease or pest evidence, and testing to assess which explanations fit the available evidence.
What records should attorneys obtain in a crop loss dispute?
Relevant records may include planting and harvest data, historical yields, chemical and irrigation records, testing, photographs, weather data, field maps, scouting records, equipment information, and financial documents. The most useful records depend on the disputed issues.
Can an agricultural expert assist with a crop-insurance claim?
Yes. Depending on the issue, an agricultural expert may analyze crop condition, cause and timing of loss, field practices, acreage, production, and supporting records. Policy interpretation and coverage may involve issues beyond the agricultural expert's technical role. The expert's findings may still help address relevant factual questions.
When should an agricultural expert inspect the field?
An early inspection may be important when crop or field conditions are likely to change. Whether immediate inspection, sampling, or other preservation is appropriate depends on the alleged loss, existing evidence, and disputed technical issues.
Causation Analysis
Laboratory Testing
Environmental Sampling
Climatology
Insurance Claims
Economic Analysis
Damages Calculations
Expert Witness Insights by Area of Expertise
Expert Witness Insights by Area of Expertise
