Skip navigation and go to content.

title.gif (1527 bytes)
[ Contents ] [ Previous ] [ Next ] [ Home ]

Recognizing SPB Spots


Figure 2. - New SPB spot with mainly yellow crowns.
Figure 2. - New SPB spot with mainly yellow crowns.
When new spots first become visible, they may have only fight-green or yellow-crowned. trees (fig. 2) and not display other stages of foliage fade. This is particularly true in late spring and early summer. But by midsummer the typical expanding SPB spot has dead or dying pines in various stages of discoloration (fig. 1). The different foliage colors trace the beetle's spread through the forest. After 8-12 weeks, beetle-killed trees at the spot's origin drop their needles. Next to these bare

 

trees are red-crowned ones, most of them no longer containing beetles. Then come yellow-crowned pines that have been more recently killed. Newly attacked trees on the margin of the spot will have green crowns, and from the air you will not be able to distinguish these from unattacked trees.
 
[ Contents ] [ Previous ] [ Next ] [ Home ]