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Promote Individual Tree Resistance


Favor Most Resistant Species

Some pine species are more resistant to SPB attack than others. Also, relative susceptibility of host types differs between geographic regions (table 2). Intermediate cuttings and reproduction methods should favor species that are best suited to the site and most resistant to SPB attack.

Remove High-Hazard Trees.-

Every stand has some damaged or weakened trees that are highly susceptible to SPB attack, This damage can result from lightning, logging, ice, or other destructive agents (fig. 4). Injured trees may also attract the black turpentine beetle, and Ips species. Susceptibility is greatest immediately following damage and tends to remove severely damaged trees should be completed as soon as possible.

Figure 4. - Pines struck by lightning are attractive to bark beetles.
Figure 4. - Pines struck by lightning are attractive to bark beetles. (Photo courtesy of the South Carolina Commission of Forestry.)
 

Extreme drought or flooding increases the probability of SPB attack in stands. There is little the forester can do to prevent these conditions, but losses may be minimized through frequent aerial detection flights over high-hazard stands during periods of extreme climatic stress. Infestations that do occur in these areas should be treated using approved control procedures.2

 

Table 2. - The susceptibility of pines to SPB attack for major geographic regions of the South.

Geographic Region

Levels of susceptibility Coastal Plain Piedmont Southern Appalachian
Most resistant

Slash

Longleaf

Virginia

Loblolly

Virginia

Eastern white

Most susceptible

Shortleaf

Loblolly

Shortleaf

Shortleaf

Pitch


2 For a discussion of SPB control tactics, see "Direct Control Methods for the Southern Pine Beetle," by Swain and Remion (Agriculture Handbook 575).

 


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