Author :
Publisher :
Page : 40 pages
File Size : 27,84 MB
Release : 2014
Category :
ISBN :
Author : Maria Teresa Almanza Fandiño
Publisher : Cuvillier Verlag
Page : 131 pages
File Size : 38,30 MB
Release : 2007
Category :
ISBN : 3867271879
Solanum quitoense (Lulo) from the northern Andes is a fruit with an attractive taste. It has a high export potential but its production is hampered by insufficient pollination. Studies on the reproductive system of Lulo revealed that, due to their poricidal anthers, the flowers need pollinators for self- and cross-pollination. Pollination by native bumblebees significantly increases fruit set and quality. Experiments show that colonies of Bombus atratus can be reared in captivity and used in Lulo fields for providing increased pollination services. Modeling based on data on colony development reveal larva/workers ratio and the supply of pollen as main parameters for improving the rearing method.
Author : Alexander Endreß
Publisher :
Page : 80 pages
File Size : 36,69 MB
Release : 2014
Category :
ISBN :
Author : Food and Agriculture Organization of the United Nations
Publisher : Food & Agriculture Org.
Page : 216 pages
File Size : 42,10 MB
Release : 1995
Category : Gardening
ISBN : 9789251036594
This bulletin, based on contributions from various contributors and edited by Dr. D.W. Roubik, introduces the reader to various aspects of natural and insect pollination. It discusses the pollinators themselves, and the ecological and economic importance of pollination, as well as applied pollination in temperate, tropical oceanic islands and mainland tropics, and alternatives to artificial pollinator populations. Prospects for the future are also discussed. Chapter 2 deals with successful pollination with pollinator populations, the evaluation of pollinators and floral biology and research techniques. The behaviour of pollinators and plant phenology and various case studies on the preparation of pollinators for use in tropical agriculture are also discussed. A glossary and various appendices regarding cultivated and semi-cultivated plants in the tropics, pollination contracts and levels of safety of pesticides for bees and other pollinators are included.
Author : William C. Campbell
Publisher : Springer Science & Business Media
Page : 380 pages
File Size : 31,54 MB
Release : 2012-12-06
Category : Medical
ISBN : 1461236266
Ivermectin and abamectin, members of the avermectin family of compounds, were introduced to the market in the 1980's as a veterinary antiparasitic drug and agricultural pesticide, respectively. Their acceptance and commercial success have been remarkable; both are highly effective and in worldwide use. The efficacy of ivermectin in river blindness has expanded the interest in its use in human medicine. In response to the intense scientific and industrial interest in ivermectin and abamectin and the likelihood that they will be forerunners of an expanding family of drugs, this comprehensive monograph satisfies the need for a review and synthesis of current knowledge about the use of these substances in crop protection as well as in cattle, sheep, swine, horses, dogs, cats, birds, fish, reptiles, and in man. This overview presents chemical, biochemical, and microbiological data, as well as pharmacological, safety, and environmental aspects and covers practical use of the compounds as antiparasitic and pesticide agents, as well as the available safety data that have emerged from the clinical experience with human applications.
Author : José Javier G. Quezada-Euán
Publisher : Springer
Page : 296 pages
File Size : 32,20 MB
Release : 2018-08-03
Category : Science
ISBN : 3319777858
The stingless bees are the most diverse group of highly social bees and are key species in our planet’s tropical and subtropical regions, where they thrive. In Mexico, the management of stingless bees dates back centuries, and they were an essential part of the culture and cosmogony of native peoples like the Maya. In recent decades a vast amount of information has been gathered on stingless bees worldwide. This book summarizes various aspects of the biology and management of stingless bees, with special emphasis on the Mexican species and the traditions behind their cultivation. Much of the information presented here was produced by the author and the team of researchers at the Universidad Autónoma de Yucatán in the course of three decades of working with these insects. Given the breadth of its coverage, the book offers an equally valuable reference guide for academics, students and beekeepers alike.
Author : William G. D'Arcy
Publisher : Columbia University Press
Page : 636 pages
File Size : 34,99 MB
Release : 1986
Category : Nature
ISBN : 9780231057806
This book explores the puzzling phenomenon of new veiling practices among lower middle class women in Cairo, Egypt. Although these women are part of a modernizing middle class, they also voluntarily adopt a traditional symbol of female subordination. How can this paradox be explained? An explanation emerges which reconceptualizes what appears to be reactionary behavior as a new style of political struggle--as accommodating protest. These women, most of them clerical workers in the large government bureaucracy, are ambivalent about working outside the home, considering it a change which brings new burdens as well as some important benefits. At the same time they realize that leaving home and family is creating an intolerable situation of the erosion of their social status and the loss of their traditional identity. The new veiling expresses women's protest against this. MacLeod argues that the symbolism of the new veiling emerges from this tense subcultural dilemma, involving elements of both resistance and acquiescence.
Author : Parks and Recreation Margaret Gargiullo City of New York, National Resources Group
Publisher : Oxford University Press, USA
Page : 544 pages
File Size : 47,35 MB
Release : 2008-02-20
Category : Nature
ISBN : 0199720037
At the biological crossroads of the Americas, Costa Rica hosts one of the widest varieties of plants in the wold, with habitats ranging from tidal mangrove swamps, and lowland rainforests, to dry tropical evergreen and deciduous forests. Field Guide to Plants of Costa Rica is a must-have reference guide for beginner and expert naturalists alike. It provides a thorough survey of more than 850 plant species, each entry accompanied by color photos and a concise yet detailed narrative description. Plants are conveniently grouped by the different types of vegetation: palms, tall trees, shrubs, woody vines, herbaceous vines, herbs, grasses and ferns. Along with 1400 color photographs, the guide also includes an illustrated glossary of plant parts, five maps of Costa Rica, and laminated covers for durability in the field. With so much readily accessible information, this book is essential for exploring Costa Rica's common and conspicuous flora from the plants growing along the roadside to the best natural parks.
Author : Vernon Hilton Heywood
Publisher :
Page : 432 pages
File Size : 31,74 MB
Release : 2007
Category : Gardening
ISBN :
Flowering plant families of the world is the successor to Flowering plants of the world (1978).
Author :
Publisher :
Page : 76 pages
File Size : 21,80 MB
Release : 1991
Category : Botany
ISBN :
