The effects of selected fungicides and insecticides on growth and thebaine production of Papaver bracteatum.

The fungicides benlate, maneb, and captan depressed plant growth, thebaine concentration, and thebaine yield per plant when administered chronically to Papaver bracteatum. The chronic administration of dicofol inhibited plant growth and thebaine yield per plant, but did not affect thebaine concentration. Malathion and pyrethrins had no adverse effects on either plant growth or thebaine content.