2 edition of upsurges and recessions of the desert locust plague found in the catalog.
upsurges and recessions of the desert locust plague
|Statement||by Z. Waloff.|
|Series||Anti-locust memoir,, 8|
|Contributions||Anti-Locust Research Centre (Great Britain)|
|LC Classifications||SB945.L7 A5 no. 8|
|The Physical Object|
|Number of Pages||111|
|LC Control Number||72372346|
Plagues and recessions of Schistocerca gregaria (Forsk.) which have occurred from to are discussed, both as major plagues affecting the desert locust invasion area as a whole, and as regional plagues in each of its four main regions. Nearly all the relevant data are non-quantitative, and plagues are identified by their biogeographical characteristics and by qualitative criteria Cited by: This page was last edited on 10 March , at Content is available under CC BY-NC-SA unless otherwise noted. Game content and materials are trademarks and copyrights of their respective publisher and its licensors.
No locust plague cycles have been observed after However, during and , large-scale upsurges were reported. The damage was estimated at Rs2 lakh in . A little bit of overcrowding can transform a population of solitary desert locusts into a marauding mob with a voracious appetite. By tracking rainfall-induced changes in vegetation in the desert locust's habitat, scientists can help predict when conditions are becoming ripe for the formation of a plague.
THE LOCUST PLAGUE DESCRIBED. The judgment in the book of Joel centers on the warning of a plague of locusts. Now you may think, "Ah, little grasshoppers. Not much of a problem, eh." History records a similar event. Let me read to you: In a plague of locusts covered Palestine and Syria from the border of Egypt to the Taurus : Thomas Cash. During plague recessions, or "quiet periods," desert locusts typically live in very dry areas of Africa, the Middle East, and South-West Asia that receive fewer than eight inches of .
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Get this from a library. The upsurges and recessions of the desert locust plague: an historical survey. [Z Waloff; Anti-Locust Research Centre (Great Britain)]. East Africa is in the midst of a crisis that sounds like something out of the Book of Exodus: A plague of locusts is spreading across the region, threatening the food supply of tens of millions.
result in the production of hopper bands and swarms; outbreaks may lead to plague upsurges when populations increase and gregarize on a larger scale and over several generations (Waloff I).
The problem of preventing plagues of the Desert Locust, Schistocerca gregaria (Forsk.), proved. Desert Locust upsurges Desert Locust are always present somewhere in the deserts between Mauritania and India.
If good rains fall and green vegetation develop, Desert Locust can rapidly increase in number and within a month or two, start to concentrate, gregarize which, unless checked, can lead to the formation of small groups or bands of wingless hoppers and small groups or swarms winged adults.
We used a simple model to quantify the case for early intervention in Desert Locust campaigns and our simulations suggest that applying even a conservative rate of control from the beginning of an upsurge as part of early intervention would further reduce the size of upsurges and plagues and would contribute to a better managed Desert Locust Cited by: Preventive control and Desert Locust plagues The upsurges and recessions of the desert locust plague: an.
in methods and organization was provided by the short-lived locust upsurges of. migratory locusts develop. The terms incipient plague and plague replace the original meanings for outbreak, which is retained for both ‘local outbreaks’ and the more wide-spread, numerous, and contemporaneous ones present at the beginning of upsurges.
Population dynamics An examination of historical data shows that desert locust. short-lived locust upsurges of and 1. INTRODUCTION We come now to the crucial question of whether control operations have or have not had any significant effect on the continuing development of the overall Desert Locust situation, apart from any immediate value particular campaigns may have had for the local defence of crops.
New evidence on the nature of recession populations of the desert locust, Schistocerca gregaria (Forsk.), and on the nature and role of its outbreaks is presented. It is shown that the hopper bands and swarms reported during the –67 recession differed qualitatively and quantitatively from those characteristic of plague periods and were numerically much smaller than some low density non Cited by: A new plague of the Desert Locust Schistocerca gregaria started in ; it developed quickly in in the Sahelian countries and reached northwest Africa at the end of Author: Arnold Van Huis.
Desert Locusts can be found in 30 countries. During upsurges, they can reach as many as 60 countries. During quiet periods, known as recessions, desert locusts are usually restricted to semi-arid and arid deserts.
This includes parts of Africa, the Near East and southwest Asia that receive less than mm of rain annually. Desert Locust upsurges aren’t a new phenomenon. Locusts are one of the oldest migratory pests in the world and have wreaked havoc on crops across the globe. Desert Locust upsurges aren’t a new phenomenon.
Locusts are one of the oldest migratory pests in the world and have wreaked havoc on crops across the globe. Therefore, if this trend continues, then it is likely there will be increased locust upsurges in the Horn of Africa like we are witnessing now." The Toll of the Locusts on Human Livelihood Desert locust upsurges can affect farmers or those who raise livestock for their livelihood — that includes between 75 and 80 percent of the population in Ethiopia and : Jesslyn Shields.
The desert locust Schistocerca gregaria (Forskål) can infest an area from Mauritania to India and roughly from the Mediterranean to the Equator. Plagues with many swarms of adults and very many bands of hoppers are separated in time by recessions, when most of the locusts are scattered and confined to the 16 million square kilometre arid central by: 4.
ELSEVIER Ecological Modelling 91 () Models of desert locust phase changes Johnson Holt *, Robert A. Cheke Natural Resources Institute, Central Auenue, Chatham Maritime, Chatham, Kent ME4 4TB, UK Received 8 May ; accepted 28 September Abstract Desert locust population dynamics were modelled using the logistic equation with switches in r and K to mimic phase by: Preventing desert locust plagues optimizing management The table clearly shows that regional recessions persist while neighbouring regions contain asynchronous upsurges, plague onsets, and declines.
plagues and recessions – Recessions Outbreaks and upsurges during recessions Plagues Western region Central region Eastern region. The population dynamics of the desert locust, Schistocerca gregaria * (Forsk.), in Africa, the Middle East and Asia from to have been analysed to determine the causes of the beginning and the abrupt end of the plague of Evidence indicates that in there were no persistent sequences of breeding by gregarious populations, but in and early there were four sequences Cited by: During plague recessions, or "quiet periods," desert locusts typically live in very dry areas of Africa, the Middle East, and South-West Asia that receive fewer than eight inches of rain per : Natalie Colarossi.
An examination of historical data shows that desert locust plagues were present in 4 out of every 5 years from to the end of the – plague and that recessions predominated by: The desert locust (Schistocerca gregaria; Gryllus gregarius) is a species of locust, a swarming short-horned grasshopper in the family Acrididae.
It is one of the most devastating migratory pests in the world and it is highly mobile and feeds on large quantities of any kind of green vegetation, including crops, pasture, and : Insecta.
The desert locust, Schistocerca gregaria (Forskål) (Orthoptera: Acrididae), is usually a solitary insect that occurs in desert and scrub regions of North Africa, the Sahel, the Horn of Africa, the Arabian Peninsula, and southwestern Asia ().During the solitary phase, when major desert locust activity is in recession, desert locust populations are sparse and pose no economic : Allan T Showler.
The desert locust risk increases during the one-to-two-year continuum of favourable weather and habitats that support population increases during upsurges and plagues.Desert locust upsurges aren’t a new phenomenon. Locusts are one of the oldest migratory pests in the world and have wreaked havoc on crops across the globe for centuries.
When huge swarms infest.