Weather, Logging, and Tree Growth Associated with Fir Engraver Attack Scars in White Fir
Author: George T. Ferrell
Publisher:
Published: 1973
Total Pages: 20
ISBN-13:
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Author: George T. Ferrell
Publisher:
Published: 1973
Total Pages: 20
ISBN-13:
DOWNLOAD EBOOKAuthor: George T. Ferrell
Publisher:
Published: 1973
Total Pages:
ISBN-13:
DOWNLOAD EBOOKAuthor: Craig D. Whitesell
Publisher:
Published: 1974
Total Pages: 182
ISBN-13:
DOWNLOAD EBOOKOhia forest decline-its severity and rate of spread-was studied by aerial photographic techniques on a 197,000-acre (80,000-ha) portion of the island of Hawaii. In 1954, only 300 acres (121 ha) showed signs of severe decline; by 1972, the acreage of severely affected forest had increased to 85,200 acres (34,480 ha). Rate of decline and current severity were related to mean annual precipitation and to elevation. The epidemic is continuing. Some forests on other Hawaiian islands also display decline symptoms.
Author: George T. Ferrell
Publisher:
Published: 1972
Total Pages: 582
ISBN-13:
DOWNLOAD EBOOKAuthor: Donald Richard Owen
Publisher:
Published: 1980
Total Pages: 180
ISBN-13:
DOWNLOAD EBOOKAuthor:
Publisher:
Published: 1975
Total Pages: 2834
ISBN-13:
DOWNLOAD EBOOKAuthor: Pacific Southwest Forest and Range Experiment Station (Berkeley, Calif.)
Publisher:
Published: 1973
Total Pages: 596
ISBN-13:
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Publisher:
Published:
Total Pages: 584
ISBN-13:
DOWNLOAD EBOOKAuthor: Alan A. Berryman
Publisher: Springer Science & Business Media
Published: 2012-12-06
Total Pages: 284
ISBN-13: 1468450808
DOWNLOAD EBOOKThis book is intended as a general text for undergraduates studying the manage ment of forest insect pests. It is divided into four parts: insects, ecology, manage ment, and practice. Part I, Insects, contains two chapters. The first is intended to provide an overview of the general attributes of insects. Recognizing that it is impossible to adequately treat such a diverse and complex group of organisms in such a short space, I have attempted to highlight those insectan characteristics that make them difficult animals to combat. I have also tried to expose the insects' weak points, those attributes that make them vulnerable to manipulation by human actions. Even so, this first chapter will seem inadequate and sketchy to many of my colleagues. Ideally, this book should be used in conjunction with a laboratory manual covering insect anatomy, physiology, biology, behavior, and classifica tion in much greater depth-in fact, this is how I organize my forest entomology course. It is hoped that this first chapter will provide nonentomologists with a general feel for the insects and with a broad understanding of their strengths and weaknesses, while Chapter 2 will provide a brief overview of the diverse insect fauna that attacks the various parts of forest trees and their products.
Author: United States. Superintendent of Documents
Publisher:
Published: 1976
Total Pages: 1408
ISBN-13:
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