This is a reproduction of a book published before 1923. This book may have occasional imperfections such as missing or blurred pages, poor pictures, errant marks, etc. that were either part of the original artifact, or were introduced by the scanning process. We believe this work is culturally important, and despite the imperfections, have elected to bring it back into print as part of our continuing commitment to the preservation of printed works worldwide. We appreciate your understanding of the imperfections in the preservation process, and hope you enjoy this valuable book.
Control of insect pests and weeds by their natural enemies offers a proven, feasible, safe, ecological method to pesticidal control. In this concise and fascinating account, Paul DeBach and David Rosen trace the historical background of biological control and examine in detail some of the most famous examples of the discovery of natural enemies and their implementation as active successful biological controls. The book has been thoroughly updated to incorporate recent studies, projects and developments on all aspects of biological control. Conclusions reached, however, remain the same; more biological control is needed – alone and as the mainstay of integrated pest management programmes – if there is to be a diminished use of toxic chemicals which are more expensive, less effective and most importantly, damaging to the environment. This is a second edition of the highly successful book published in 1974 under the same title.
An excellent text on tomato plant physiology, its fruiting habit, and the factors that lead to high fruit yield and quality. Written for both the home gardener and professional grower, this fantastic resource gives readers everywhere the knowledge and requirements to grow quality tomatoes in any medium.
This book was converted from its physical edition to the digital format by a community of volunteers. You may find it for free on the web. Purchase of the Kindle edition includes wireless delivery.
This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1911 edition. Excerpt: …boy could neither speak nor understand a word of English, but the hotel proprietor had instructed him where to go. We plunged into the narrow streets of a great Chinese city, the boy running wherever he could, walking where he must on account of the density of the crowds or the roughness of the stone paving. We had turned many corners, crossed bridges and passed through tunneled archways in sections of the massive city walls, until it was getting dusk and the ricksha man purchased and lighted a lantern. We were to reach the college in thirty minutes but had been out a full hour. A little later the boy drew up to and held conference with a policeman. The curious of the street gathered about and it dawned upon us that we were lost in the night in the narrow streets of a Chinese city of a hundred thousand people. To go further would be useless for the gates of the mission compound would be locked. We could only indicate by motions our desire to return, but these were not understood. On the train a thoughtful, kindly old German had recognized a stranger in a foreign land and volunteered useful information, cutting from his daily paper an advertisement describing a good hotel. This gave the name of the hotel in German, English and in Chinese characters. We handed this to the policeman, pointing to the name of the hotel, indicating by motions the desire to return, but apparently he was unable to read in either language and seemed to think we were assuming to direct the way to the college. A man and boy in the crowd apparently volunteered to act as escort for us. The throng parted and we left them, turned more corners into mors unlighted narrow alleyways, one of which was too difficult to permit us to ride. The escorts, if such they were,…
