Results 211 to 220 of about 22,323 (244)

Desert locust plagues

Endeavour, 1995
Abstract Some 3000 years ago the prophet Joel listed four great plagues afflicting his people: the locust, the cankerworm, the caterpillar and the palmerworm. Despite great advances in both chemical and biological methods of control, the Desert Locust still periodically wreaks havoc over large areas. Apart from the intrinsic difficulty of the problem,
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Preventive control and Desert Locust plagues

Crop Protection, 2008
The original locust control strategy assumed that plagues arose when swarms escaped from outbreak areas and bred successfully in the surrounding invasion area. Thus, control within outbreak areas could prevent plagues. Plague prevention was achieved for species with small, relatively accessible outbreak areas providing resources allocated to preventive
Magor, J.L., Lecoq, Michel, Hunter, D.M.
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Aspergillosis in desert locust (Schistocerka gregaria Forsk)

Mycopathologia, 1975
Fatal Aspergillus flavus infection of Desert Locust at Field Station for Investigations on Locusts, Bikaner, India, has been described. The infection appeared in the form of pinkish to brownish black patches with hardening of the affected regions, paralysis and twichings of the legs.
M V, Venkatesh, K R, Joshi, S C, Harjai, I N, Ramdeo   +3 more
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Development of a desert locust plague

Nature, 1975
THE role of phase change in the development of plagues of the desert locust, Schistocerca gregaria (Forskal), has been debated for many years1–5. Much confusion has arisen because changes in behaviour, form and colour, which have all been used as indicators of phase status, do not proceed at the same rates.
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Desert Locusts in Africa: a Disaster?

Disasters, 1995
Migrating locusts, especially the desert locust (Schistocerca gregaria), have been feared in Africa for thousands of years as famine‐inducing pests. Instead of simply waiting for outbreaks to occur, attempts are being made to take preventive action against these pests.
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Bracken and Locust Ecdysones: Their Effects on Molting in the Desert Locust

Science, 1968
Bracken contains ecdysone derivatives that are active when injected into locusts. However, when fed to the desert locust as its sole or chief diet, it does not affect molting, growth, or development. There is evidence that, in locusts, the active ecdysones are dehydroxylated to α-ecdysone and passed out through the gut in the feces.
D B, Carlisle, P E, Ellis
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Models of desert locust phase changes

Ecological Modelling, 1996
Abstract Desert locust population dynamics were modelled using the logistic equation with switches in r and K to mimic phase changes. An earlier model with stepwise switches of reproductive rates was modified to include switches of carrying capacity, dependent on population density and random environmental variation.
Johnson Holt, Robert A. Cheke
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Desert locust control strategies

1997
Summary The problems of combating desert locust upsurges change as an upsurge develops. The initial outbreak occurs with little warning and so must be fought by attacking nymphal infestations with the resources on hand. The ultra low volume nymphal target blocks are difficult to define at all stages of an upsurge.
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Can we prevent desert locust plagues?

1997
Summary For centuries people in Africa have been catching locusts not only to protect their crops but also to cat. In the beginning of this century locusts were controlled by mechanical means. When persistent insecticides and advanced application methods became available, emphasis shifted towards obtaining overall population reduction.
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Meteorology and Desert Locust Forecasting1

EPPO Bulletin, 1983
The now very considerable understanding of weather effects on breeding and movement by the desert locust has been used to prepare a forecasting manual. It is a two‐volume, 400‐page publication that describes, explains and illustrates the principles of modern forecasting, and includes not only much material on the biology and ecology of this species but
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