RNGR.net is sponsored by the USDA Forest Service and Southern Regional Extension Forestry and is a colloborative effort between these two agencies.

U.S. Department of Agriculture USDA Forest Service Southern Regional Extension Forestry Southern Regional Extension Forestry

Skip to content. | Skip to navigation

Home Publications Tree Planters' Notes Tree Planters' Notes Volume 22, Number 2 (1971) Forecasting Weather Favorable for Fusiform Rust Infection

Forecasting Weather Favorable for Fusiform Rust Infection

In southern pine nurseries, infection of seedlings with fusiform rust takes place chiefly during April, May, and June, at which times telia of the causal fungus ( Cronartium fusiforme Hedge. & Hunt ex Cumm.) are present on leaves of oaks, the alternate host. Nearly all infection occurs during periods of warm, humid weather, when the telia produce airborne basidiospores that establish themselves on succulent tissues of pines. Fungicidal sprays, regularly scheduled, are essential as long as viable telia remain on the oaks. Research has established, however, that reinforcement spraying just before periods of high humidity will increase control by protecting tissue formed since the last scheduled spraying (2). The question remains whether localized high-hazard conditions can be reliably predicted. We recently suggested that they can be (1), and this paper reports an initial test of the proposition. The test was made in 1969, when the forestry meteorologist for Mississippi prepared forecasts for three cooperating forest nurseries in the south-central part of the State.

Download this file:

PDF document Download this file — PDF document, 114Kb


Author(s): Glenn A. Snow, R. T. Davis

Publication: Tree Planters' Notes - Volume 22, Number 2 (1971)

Volume: 22

Number: 2