Our CCA treated orchard tree stakes are primarily Douglas fir. Pine or Douglas fir orchard tree stakes are made from 100% core stock with no sap wood so they don't treat very deeply. With most tree stake applications the primary concern is that they are strong and last two to three years after which the stakes are normally removed and thrown away. For this reason alot of California tree planters are electing not to have any treatment at all and go for a strictly organic application. Without treatment our 100% heartwood stock is actually superior to a stake containing sapwood that has more moisture and sugars that actually accelerate and contribute to decay.