Development Rate Alteration
Definition
A drug- or toxin-induced shift in the time from oviposition to pupation. Stimulant compounds tend to accelerate development; certain heavy metals and some insecticides retard it or cause larval death.
- Field
- Entomotoxicology
- Effect of stimulants
- Typically accelerates larval development
- Effect of some heavy metals/insecticides
- Retards development or causes larval death
- Consequence
- Skews postmortem interval estimates based on insect age
Common questions
Why does a toxicologist need to know about drugs in the body when estimating time of death from insects?+
Standard development tables assume normal, drug-free growth rates, so if the deceased had stimulants or certain toxins in their tissue at the time insects fed, the larvae can mature faster or slower than the table predicts, and using the table unadjusted would produce a postmortem interval estimate that is too short or too long.
How is development rate alteration accounted for in casework?+
Toxicological screening of larvae or the remains for the suspected substance, combined with published studies on how that specific compound shifts development timing for the species present, lets the entomologist apply a correction rather than reading the degree-hour table at face value.
Related terms
- Bioaccumulation in Insects
- The uptake and concentration of a toxicant from the substrate (decomposing tissue) into insect tissues during larval feeding. Concentration in larval tissue...
- Empty Puparium
- The hardened larval skin (puparium) left behind after adult emergence. It retains chemical residues including drug metabolites and can be the only...
- Entomotoxicology
- The analysis of insect tissue for drugs and toxins when decomposition has made conventional biological fluids unavailable. Blow-fly larvae feeding on a...
- Larval Crop Contents
- The partially digested material in the larval foregut, reflecting the most recent substrate the larva fed on. Useful for detecting what the...
- PMI Correction
- Adjustment of the post-mortem interval estimate to account for documented drug or toxin effects on larval development rate. Without correction, a drug-accelerated...