Characterizing Fusiform Rust Incidence and Distribution in East Texas

Abstract

Three measurement cycles were completed on an extensive network of loblolly (Pinus taeda L.) pine and slash (Pinus elliottii Engelm.) pine plots in industrial plantations throughout East Texas in 1984, 1987, and 1990. Because the incidence of fusiform rust caused by Cronartium quercuum [Berk.] Miyabe ex Shirai f. sp. fusiforme had been recorded at each measurement, it is possible to characterize the temporal and geographic distribution of fusiform rust among these industrial pine plantations in East Texas. Average rust incidence for each species by two year age classes is presented. For loblolly pine, there is no apparent change in overall average incidence between 1987 and 1990, whereas for slash pine, there is an apparent overall average decline of about 7-8 percentage points. For some slash pine age classes, the incidence decline is 20-30 percentage points. Loblolly and slash pine rust incidence maps depict the geographic distribution of rust infection by plantation age groups in East Texas. South. J. Appl. For. 18(1):29-34.

Predicting Survival of East Texas Loblolly and Slash Pine Plantations Infected with Fusiform Rust

“…fusiforme). Average incidence of stem galls in loblolly pine plantations 5 yr or older in East Texas has been reported as: 6% in 1969, 7% in 1984, 10% in 1987, and 10% in 1990(Mason and Griffin 1970, Hunt and Lenhart 1986, Lenhart et al 1988and Lenhart et al 1994. In contrast, average incidence of stem galls on planted slash pines 5 yr or older in East Texas has been reported as: 46% in 1984, 48% in 1987, and41% in 1990 (Hunt andLenhart 1986, Lenhart et al 1988 and in press, respectively).…”