Arboriculture Terms

the presence of a pest population on a host plant or group of plants.

I) downward entry of water into the soil (contrast with percolation). 2) entry of fine particles into drainage or aeration systems; can lead to system clogging and failure. 3) downward entry of materials from one soil or fill layer to another. as when a gravel road surface mixes with underlying soil.

speed at which water penetrates the soil.