Why do herbivores have more DDE inside of them than the producers?

Herbivores tend to accumulate more DDE (a breakdown product of the pesticide DDT) than producers due to a process called biomagnification. When herbivores consume plants, they ingest DDE that has been absorbed by the producers from the environment. As herbivores metabolize these plants, DDE accumulates in their tissues, often at higher concentrations than in the plants themselves, due to their higher position in the food chain and the inefficiency of energy transfer between trophic levels. This results in herbivores having a greater concentration of DDE compared to the plants they feed on.