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The Reproduction of the Red Locust, Nomadacris septemfasciata (Serv.) (Orthoptera, Acrididae), in an Outbreak Area

Published online by Cambridge University Press:  10 July 2009

I. A. D. Robertson
I. A. D. Robertson
Affiliation:
International Red Locust Control Service, Abercorn, Northern Rhodesia.
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Extract

During the breeding seasons 1952 to 1955, samples of females of the Red Locust, Nomadacris septemfasciata (Serv.), were caught in the Rukwa Valley, Tanganyika Territory, and the ovaries classified according to egg length. Ovaries designated Class V were those regarded as containing eggs ready for oviposition. Population estimates and rainfall records were also taken.

The data suggested that the eggs in the ovaries develop very rapidly, becoming ready to be laid about seven days after the start of development.

The increase in weight of an individual female during ovary development is related to absolute size, and it was found that, during ovary development, the weight increases by approximately one-half.

The most important factor initiating ovarian development seemed to be a drop in daily maximum temperature to below 36°C. The factors of high humidity and rainfall were of less importance but their influence is not fully understood. The possibility of change in length of day being an important factor in the initiation of ovarian development is discussed.

The limiting factors for the number of egg-pods laid in a season are considered to be the dates of the drop in daily maximum temperature and of the drop or decline in parental population. The date of drop or decline in parental population seemed to be connected with the date of drop in daily maximum temperature.

The percentage of females laying more than one egg-pod was calculated, and the resuJts were found to vary considerably from year to year, although the average of 1 pods per female agreed with past estimates. Also, the average period of 16 days between successive egg-layings agreed with past work.

Drought, during the laying period, seemed to cause the females to retain their ripe eggs.

The evidence tended to confirm the possibility of a Red Locust population being able to increase 100-fold in a single year.

Type
Research Paper
Information
Bulletin of Entomological Research , Volume 49 , Issue 3 , September 1958 , pp. 479 - 496
Copyright
Copyright © Cambridge University Press 1958

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References

Albrecrt, F. O. (1953). The breeding of the Red Locust in captivity.—Bull. ent. Res., 44, pp. 1–4.CrossRefGoogle Scholar
Albrecrt, F. O. (1956). Limitation des effectifs chez un acridien: influence de la sécheresse du sol sur les oeufs de Nomadacris septemfasciata (Serv.).—Locusta, no. 4, pp. 1–21.Google Scholar
Burnett, G. F. (1951). Observations on the life-history of the Red Locust, Nomadacris septemfasciata (Serv.) in the solitary phase.—Bull. ent. Res., 42, pp. 473–490.CrossRefGoogle Scholar
Faure, J. C. (1935). The life history of the Red Locust (Nomadacris septemfasciata (Serville)).—Bull. Dep. Agric. S. Afr., no. 144, 32 pp.Google Scholar
Hamilton, A. G. (1936). The relation of humidity and temperature to the development of three species of African locusts—Locusta migratoria migratorioides (R. & F.), Schistocerca gregaria (Forsk.), Nomadacris septemfasciata (Serv.).—Trans. B. ent. Soc. Lond., 85, pp. 1–60.CrossRefGoogle Scholar
Johnston, H. B. & Buxton, D. B. (1949). Field observations on locusts in eastern Africa.—Anti-Locust Bull., no. 5, 73 pp.Google Scholar
Lea, H. A. F. & Mcmartin, A. (1934). The problem of the Bed Locust.—S. Afr. Sug. J., 18, pp. 137–143.Google Scholar
Lees, A. D. (1955). The physiology of diapause in arthropods.—Camb. Monogr. exp. Biol., no. 4, 151 pp. Cambridge, Univ. Pr.Google Scholar
Mossop, M. C. (1933). Notes on the biology and control of the Bed Locust in Southern Rhodesia, 1932–1933. Part 2. Biological notes on the Red Locust, Nomadacris septemfasciata, Serv.—Bhod. agric. J., 30, pp. 815–837.Google Scholar
Norris, M. J. (MrsRichards, O. W.) (1957). Factors affecting the rate of sexual maturation of the Desert Locust (Schistocerca gregaria Forskål) in the laboratory.—Anti-Locust Bull., no. 28, 26 pp.Google Scholar
Phipps, J. (1949). The structure and maturation of the ovaries in British Acrididae (Orthoptera).—Trans. R. ent. Soc. Lond., 100, pp. 233–247.CrossRefGoogle Scholar
Robertson, I. A. D. (1954). The numbers of eggs in pods of the Red Locust, Nomadacris septemfasciata (Serville) (Orth., Acrididae).—Ent. mon. Mag., 90, PP. 254–255.Google Scholar
Smee, C. (1936). Notes on the Red Locust (Nomadacris septemfasciata, Serv.) in Nyasaland 1933–34.—Bull. ent. Res., 27, Pp. 15–35.CrossRefGoogle Scholar