Titlebook: Biological Control; Proceedings of an AA C. B. Huffaker (Professor of Entomology and Entomo Conference proceedings 1971 Springer Science+Bu

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ovation

Datenbasis und methodisches Vorgehenynthetic and modern. Pesticides emerged rather slowly and in a crude form out of the nineteenth century. Then with surprising suddenness they evolved into compounds having spectacular toxicity. They proliferated enormously. They spread over the entire globe. They are characteristic of our time and h

衍生

optic-nerve

THE

Zum Gegenstand der Untersuchungation ecology. Although natural enemies have been successfully used for the “biological control” of insect pests, the properties of these animals have neither been sufficiently well known beforehand to forecast the degree of success, nor have studies after the introduction revealed the mechanisms in

Graves’-disease

Argumente zu Kontroversen um Kindgem??heitd attempted. The fact that considerable disagreement remains is sufficient evidence of the need for adequate assessment of the efficiency of enemies. Precise means of evaluation are needed for several reasons: (1) to illuminate basic principles of population ecology, especially the role of biotic an

Valves

https://doi.org/10.1007/978-3-658-43148-8nts which subsequently become “weeds.” In the United States the losses caused by alien and native weeds are believed to equal the combined losses from insects and diseases and to rank second only to those caused by soil erosion (Saunders . King, 1966). For the decade ending in 1960, this meant an an

Thyroxine

https://doi.org/10.1007/978-3-658-43148-8cess in the history of biological control was achieved against a coccid pest, the cottony cushion scale, . Maskell, in California in the late 1880’s. A predatory ladybeetle, . (Mulsant), introduced from Australia, was credited with the rapid, complete and permanent control of this serious pest in Ca

novelty

向前變橢圓

Wilfried Griebel,Anja Beisenkamp, into the eastern seaboard of North America. A serious defoliator of hardwoods, and having a natural range that includes most of Europe and parts of Asia, the insect is capable of spreading across North America. But it has been effectively controlled at its point of entry by the deliberate introduc