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Southern Pine Beetle Situation

April/May, 2008

A surprising trend is occurring with the number of detected southern pine beetle (SPB) infestations in the state. Generally, as the summer months approach and the temperature increases, more SPB activity is present. The actual outcome, however, is slightly different. The average rainfall and the normal temperatures this year have a great influence on beetle activity and tree vigor. Last year in May, the state experienced a moderate to extreme drought conditions; this year is quite the contrary. The precipitation and temperature thus far are basically normal. Because of these “normal” weather patterns, the results have been a period of low SPB activity.

The April/May detection flights show that the state has only 9 spots infesting 625 trees. This number is drastically less from last year’s April/May flights which had 66 spots with 5,005 infested trees. There are no epidemic counties reported during this flight period. The NW region has the most spots with 6, all located in Winston County. After a reconnaissance flight of the region, the SE has no detected spots.

With the prediction that the precipitation and temperatures will remain relatively normal throughout the summer, the SPB infestation should continue to be low. The 2008 SPB survey also indicates that beetle activity will be minimal. The number of spots and infested trees are actually less than they were during the January/February flight period. During this period, only selected counties were detected for SPB infestation, but this sample of counties is still a good indicator of beetle activity in the state. There is a perplexing question about beetle activity and the effect of the drought in 2006 and 2007. Perhaps the “normal” weather conditions will continue to alleviate some of the stress on trees and create an environment of declining beetle activity. The approaching summer months will definitely determine if this prediction holds true.

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