. . . . . . . . . . . . . . . . . . . . . "Bark-louse and pear-tree slug"@en . . . "Bark-louse and pear-tree slug" . . . "Ontario. Department of Agriculture." . . "Poire Maladies et fléaux Ontario." . . "Pears Diseases and pests Ontario." . . "Ontario Agricultural College." . . "Insect pests Control." . . "Pears Diseases and pests." . . "Ontario." . . "Insectes nuisibles, Lutte contre les." . . . .