Occurrence and Pathogenicity ofVerticicladiella procerain Christmas Tree Plantations in Virginia

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Abstract
V. procera was identified as the cause of severe losses in some Christmas tree plantations in Virginia. Losses for 1980 totaled about 700 marketable trees in 8 plantations. V. procera was isolated from Pinus strobus, P. sylvestris and P. nigra. Pathogenicity was determined by inoculating 2 yr old P. strobus seedlings with V. procera. Inoculation was accomplished by dipping root systems in a spore suspension or by inserting small blocks of white pine stem wood colonized with V. procera into a slit wound in the taproot. Inoculated seedlings began dying in 2 wk and continued to die over a 10 wk period. V. procera was isolated from 50% of the seedlings inoculated by root-dip and from 25% of the seedlings inoculated by colonized blocks. V. procera was isolated only from dead, inoculated seedlings.

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