Q: What is the half-life in soil of 2,4-D? How can I tell if it is the culprit for damage to my tomatoes?

A: 2,4-D is a common component of broadleaf weedkillers. According to material from Canada, the half-life is 10 days and the effect on plants is cupping, puckering and strapping of leaves.

For a complete overview of many pesticides and their properties and effects see

Herbicide Mode of Action Categories

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