Title: Tip-Dieback in Young Loblolly Pine Plantations
Author: South, David B.; Brown, Patrick; Dougherty, Phillip M.; Olykan, Sonya; Runion, Brett; Singh, Adya; Skinner, Malcolm;
Source: In: Gen. Tech. Rep. SRS-48. Asheville, NC: U.S. Department of Agriculture, Forest Service, Southern Research Station. pg. 574-578
Publication Series: Miscellaneous Publication
Description: Dieback of loblolly pine (Pinus taeda L.) has been observed in certain intensively managed plantations throughout the South. There are two distinct types of dieback; winter dieback usually appears in February and March while summer dieback appears in July (or later) and increases during the fall. Both types have very high levels of K in terminal shoots. Winter dieback progresses in a "top-down" pattern while summer dieback progresses in a "bottom-up" pattern. Winter-dieback appears to be related to freezes and growth rate as slower-growing wildlings in the plantation almost never exhibit dieback. Freeze injury (brown cambium) is sometimes observed in the stem (at breast-height) and in the terminal shoot. Often the terminal pith turns brown. One fast-growing family, 7-56 from the Coastal Plain in South Carolina, is sensitive to freezes and is prone to tip-dieback. Although winter dieback is most noticeable in plantations, it also occurs on open-grown trees that are growing in weedy, non-fertilized areas. Land managers have grown accustomed to this dieback in rapidly growing plantations that are 2 to years old. On some soils, summer dieback appears to be exacerbated after fertilization with macronutrients. There is currently no consensus as to the cause of this phenomenon but we believe that growth rate, freezes, K, and B may be involved. This paper reviews some of the literature on dieback on pines and proposes some hypotheses to test.
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South, David B.; Brown, Patrick; Dougherty, Phillip M.; Olykan, Sonya; Runion, Brett; Singh, Adya; Skinner, Malcolm 2002. Tip-Dieback in Young Loblolly Pine Plantations. In: Gen. Tech. Rep. SRS-48. Asheville, NC: U.S. Department of Agriculture, Forest Service, Southern Research Station. pg. 574-578
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