Block · one region of the page, as the scanner read it. It may hold a whole story, part of one, several, or an advertisement; stitching blocks into articles is the next step. Text is supplied OCR.
Page 15 · column 1 of 6 · from the scan, no model involved
Pests
From Page B1
Dutch elm disease, which devastated woodland and urban forests in the 20th century.”
Forest pests thrive when tree health s already compromised by other stressors— from other biological assaults * to air pollution, acid rain, and increasing cycles of drought. Drought can be a particular problem, since many of the species that help control pests are more susceptible to drought than the pests are.
The loss of any species of tree can mean the loss of other species that depend on it, which eventually can lead to the collapse of the entire ecosystem. However, the future or trees species targeted by insect pests is not completely bleak. As with human disease, biological attacks rarely spell the end of the host species. The healthiest trees, and those with genetic
83.8%