An aggressive strain of Phytophthora ramorum — the pathogen responsible for sudden oak death — has been identified in Douglas fir and grand fir samplings in southwest Oregon.
Three main whiteflies exist in both greenhouse and nursery production; sweet potato whitefly (Bemisia tabaci), greenhouse whitefly (Trialeurodes vaporarorium) and banded winged whitefly (T. abutiloneus).
This study will determine if pesticide seed treatments inadvertently protect weed seeds in the soil from being attacked by naturally occurring invertebrate and fungal species.
Here we highlight the changes in the physical, hydrologic and chemical properties of pine bark over 12 months of managed aging. Researchers at North Carolina State University discuss how the aging process affects hydrologic properties, which are largely influenced by physical properties.
Scientists from the USDA Forest Service have predicted that the native tree species in a 7-million-acre area in the Chicagoland region may decline — leaving invasive species to thrive in their place.