This book comprehensively reviews current pest management practices and explores novel integrated pest management strategies in Brassica oilseed crops. It is essential reading for pest management practitioners and researchers working on pest management in canola and other Brassica crops worldwide. Canola, mustard, camelina and crambe are the most important oilseed crops in the world. Canola is the second largest oilseed crop in the world providing 13% of the world's supply. Seeds of these species commonly contain 40% or more oil and produce meals with 35 to 40% protein. However, its production has declined significantly in recent years due to insect pest problems. The canola pest complexes are responsible for high insecticide applications on canola. Many growers rely on calendar-based spraying schedules for insecticide applications. The diamondback moth Plutella xylostella and flea beetles Phyllotreta spp. (P. cruciferae and P. striolata)cause serious damage to canola. In the Northern Great Plains, USA, for instance, P. xylostella is now recorded everywhere that canola is grown. Severe damage to canola plants can be caused by overwintering populations of flea beetles feeding on newly emerged seedlings. Cabbage seed pod weevil (Ceutorhynchus obstrictus), swede midge (Contarinia nasturtii), and tarnished plant bug (Lygus lineolaris) are also severe pests on canola. Minor pests include aphids (cabbage aphid, Brevicoryne brassicae and turnip aphid, Hyadaphis erysimi) and grasshopper, Melanoplus sanguinipes. This book: * is the only single compiled source of information on integrated management of canola and other Brassica oilseed pests * presents the biology and management of all the major and minor pests of Brassica oilseed crops * is an essential source of information for applied entomologists, crop protection researchers, extension agents and stakeholders

Canada is a world leader in biological control research. Reporting the status of biocontrol agents released in Canada over the last decade, this book presents case studies by target pest that evaluate the impact of biocontrol and recommend future priorities. In addition to a new chapter on future targets and an appendix listing established agents, this edition contains information of interest to a global audience, and chapters that address effects of invasive species and climate change.

La estratificacion social es uno de los temas mas relevantes que se ha desarrollado en la sociologia y su importancia esta aun vigente. De acuerdo a Filgueira (2001) dos son los motivos para reabrir la tematica de las clases, la estratificacion y la movilidad social en America Latina. El primero de estos es la necesidad de comprender los cambios que se estan produciendo en la naturaleza de los sistemas de estratificacion; y, el segundo, se refiere a la carencia de conocimiento e investigacion en la actualidad. En general los modelos teoricos utilizados durante los ultimos 25 anos han sido creados fuera de America Latina, por lo cual se requiere de un esfuerzo intelectual que de cuenta de las especificidades propias de la region. Esfuerzo que se ve reflejado en este trabajo que centro su atencion en el analisis de la estratificacion ocupacional presente en la Region del Bio-Bio (Chile) entre 1982 y 2002, basandose en el enfoque teorico neoweberiano producto de su alta eficiencia empirica."