Phenylmercuric acetate (0.001 M) reduced transpiration of ponderosa pine and Douglas fir in a greenhouse without increasing foliage temperatures. The reductions were 48% and 24%, respectively, and the effect lasted at least seven days. Some foliage on one treated tree of each species showed browning four weeks after treatment.

Phenylmercuric acetate effectively reduces transpiration of ponderosa pine and Douglas fir without increasing foliage temperatures, but some foliage may show browning four weeks after treatment.

Paper

Transpiration of Ponderosa Pine and Douglas Fir after Treatment with Phenylmercuric Acetate

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