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Oak wilt, gypsy moth caterpillars, spruce bud worm and lately dogwood anthracnose and hemlock woolly adelgid are only some of the better known problems with which gardeners, foresters and ecologists must contend.
Fishermen and other mariners who used caravels along the Atlantic coast of Portugal and the Cantabrian coast of Spain probably strengthened the hull to withstand the open ocean, perhaps using small whaling vessels as their model. As the Portuguese explored the coastline of Africa, they used small caravels with a two-masted lateen rig for many tasks, especially after they rounded Cape Bojador. The lateen caravel could beat its way home while keeping within reassuring sight of the coast.
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