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    Author(s): Robert F. Scharpf; John R. Parmeter Jr.
    Date: 1976
    Source: Res. Paper PSW-RP-122. Berkeley, CA: U.S. Department of Agriculture, Forest Service, Pacific Southwest Forest and Range Exp. Stn. 9 p
    Publication Series: Research Paper (RP)
    Station: Pacific Southwest Research Station
    PDF: View PDF  (553 KB)

    Description

    Rate of population buildup of dwarf mistletoe, Arceuthobium abietinum Engelm. ex Munz., was slow in most small red firs and white firs 12 to 15 years after inoculation with the parasite. Where population buildup did occur, it remained clustered in the lower portions of tree crowns near inoculation sites. Maximum distance of vertical spread was 16 feet (4.8 m), after 15 years. The mean annual rate of vertical spread of the parasite in 12 to 15 years was 3 inches (7 cm) or less in test trees. No vertical spread occurred in some trees. Rate of vertical spread was much slower in all trees than the mean annual height growth of vigorous young red or white firs. Therefore, the test trees were outgrowing the spread of dwarf mistletoe within tree crowns. Vertical spread rate and rate of tree height growth together determine the proportion of tree crown that will be infested at a given time after inoculation.

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    Citation

    Scharpf, Robert F.; Parmeter Jr., John R. 1976. Population buildup and vertical spread of dwarf mistletoe on young red and white firs in California. Res. Paper PSW-RP-122. Berkeley, CA: U.S. Department of Agriculture, Forest Service, Pacific Southwest Forest and Range Exp. Stn. 9 p

    Keywords

    dwarf mistletoe, population dynamics, epidemiology, vertical spread, red fir, white fir, Abies concolor, Abies magnifica, Arceuthobium abietinum, Viscaceae

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https://www.fs.usda.gov/treesearch/pubs/29639