Diplodia pinea, Diplodia scrobiculata and Lasiodiplodia theobromae in south Georgia pine plantations and their respective roles in causing tip dieback in southern pine species
House, Emily Susanna
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Diplodia pinea and D. scrobiculata damage a myriad pine species. Previous reports suggest that Lasiodiplodia theobromae also causes tip dieback of slash and loblolly pines. A survey of two South Georgia pine plantations for the presence and distribution of these three pathogens was conducted during 2005 and 2006. Diplodia pinea, D. scrobiculata, and L. theobromae were isolated at equal rates from all shoots. No significant relationship exists between tree age and the isolation of these fungal species. Questions of reliability surround two methods used in the identification of these fungal species. Isolates obtained during the survey were used to assess pathogenicity on slash, loblolly, shortleaf, and Virginia pine seedlings. Slash and loblolly pines were susceptible to isolates of D. pinea, D. scrobiculata, and L. theobromae. Shortleaf pine was susceptible to isolates of D. pinea and D. scrobiculata. Virginia pine was susceptible to isolates of D. pinea and L. theobromae.