Hostname: page-component-586b7cd67f-t7fkt Total loading time: 0 Render date: 2024-12-01T04:01:32.614Z Has data issue: false hasContentIssue false
  • English
  • Français

The Influence of Spray Programs on the Fauna of Apple Orchards in Nova Scotia. XI. Effects of Low Dosages of DDT on Predator Populations1

Published online by Cambridge University Press:  31 May 2012

F. T. Lord
Get access Rights & Permissions [Opens in a new window]

Extract

The varied interpretations by numerous biologists, of the role of predation in population dynamics have been critically reviewed by Holling (1959) and by Huffaker and Kennett (1956). They conclude that the processes of predation may serve to regulate prey density and disagree with generalizations that minimize the role of predation. This role has been a subject of considerable interest in recent years, notable contributions being the laboratory investigations of Collyer (1958) and Huffaker (1958), and the field studics of Holling (1959).

Type
Articles
Information
The Canadian Entomologist , Volume 94 , Issue 2 , February 1962 , pp. 204 - 216
Copyright
Copyright © Entomological Society of Canada 1962

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

Collyer, Elsie, 1958. Some insectary experiments with predacious mites to determine their effect on the development of Metatetrany chus ulmi (Koch) populations. Ent. Exp. & Appl. 1: 138–146.CrossRefGoogle Scholar
DeBach, Paul. 1946. An insecticidal check method for measuring the efficiency of entomophagous insects. J. Econ. Ent. 39: 695–697.CrossRefGoogle Scholar
Henderson, C. F., and McBurnie, H. V.. 1943. Sampling technique for determining populations of the citrus red mite and its predators. U. S. Dept. Agr. Circ. 671.Google Scholar
Holling, C. S. 1959. The components of predation as revealed by a study of small mammal predation of the European pine sawfly. Canadian Ent. 91: 293–320.CrossRefGoogle Scholar
Huffaker, C. B. 1958. Experimental studies on predation: dispersion factors and predator prey oscillation. Hilgardia 27 (14) : 343–383.CrossRefGoogle Scholar
Huffaker, C. B. and Kennett, C. E.. 1956. Experimental studies on predation: Predation and cyclamen-mite populations on strawberries in California. Hilgardia 26 (4) : 191–222.CrossRefGoogle Scholar
Jaques, R. P. 1959. Unpublished Report. Agric. Res. Station, Kentville, N.S.Google Scholar
Lord, F. T. 1947. The influence of spray programs on the fauna of apple trees in Nova Scotia: II Oystershell scale, Lepidosaphes ulmi (L.). Canadian Ent. 79: 196–209.Google Scholar
Lord, F. T. 1949. The influence of spray programs on the fauna of apple trees in Nova Scotia. III. Mites and their predators. Canadian Ent. 81: 202–230.Google Scholar
Lord, F. T. 1956. The influence of spray programs on the fauna of apple orchards in Nova Scotia. IX. Studies on means of altering predator populations. Canadian Ent. 88: 129–137.CrossRefGoogle Scholar
Lord, F. T., Herbert, H. J., and MacPhee, A. W., 1958. The natural control of phytophagous mites on apple trees in Nova Scotia. Proc. Tenth Int. Congr. Ent. Montreal, 1956, 4: 617–622.Google Scholar
Lord, F. T. and MacPhee, A. W.. 1953. The influence of spray programs on the fauna of apple trees in Nova Scotia. VI. Low temperatures and the natural control of oystershell scale, Lepidosaphes ulmi (L.) (Homoptera, Coccidae). Canadian Ent. 85: 282–291.CrossRefGoogle Scholar
MacPhee, A. W. and Sanford, K. H.. 1956. The influence of spray programs on the fauna of apple orchards in Nova Scotia. X. Supplement to VII. Effects on some beneficial arthropods. Canadian Ent. 88: 631–634.Google Scholar
Stultz, H. T. 1961. Unpublished Report. Agric. Res. Station, Kentville, N.S.Google Scholar