Journal Article

Invasions and Local Outbreaks of Four Species of Plague Locusts in South Africa: A Historical Review of Outbreak Dynamics and Patterns

Price, Roger Edward

2023

Overview

The current paper provides a detailed review of the historical outbreaks of each of the four plague locust species found in South Africa, namely the brown locust, the African migratory locust, the red locust, and the southern African desert locust. The history and dynamics of the plague infestations and the major local outbreaks are summarized. The typical patterns of the outbreaks of the different species are described, and the threat of these locusts to agriculture in South Africa is defined. The brown locust produces regular outbreaks in the semi-arid Karoo, with large-scale eruptions of plague proportions occurring about once per decade. Patterns of outbreaks often repeat themselves, but the sheer size of the plague outbreaks is almost impossible to stop, and the brown locust has the potential to threaten food security throughout southern Africa. The African migratory locust produces outbreaks in some of the main maize and wheat cropping areas where it is difficult to control. This locust has taken advantage of the man-made crop environment to produce an extra generation per year that was not previously possible in the original grasslands. The coastal area of KwaZulu Natal Province in South Africa was a prime reception and breeding area for plague invasions of the red locust in the past, and the country, therefore, relies on the successful control of outbreaks in east and central Africa to prevent the recurrence of the plague invasions. The southern African desert locust occurs in the Kalahari Desert area, and outbreaks requiring chemical control are rare.

• Publisher: MDPI AG
• Subject: 20th century / African migratory locust / Agricultural pests / Agricultural production / Agriculture / Aridity / Arsenic / Biological invasions / Breeding sites / brown locust / Central Africa / Cereal crops / Chemical control / Coastal zone / coasts / corn / Crops / deserts / Economic importance / Eruptions / Farmers / Food security / Forecasts and trends / Grasslands / Historical account / Insecticides / Invasive species / Kalahari Desert / locust outbreak dynamics / Locusta migratoria migratorioides / Locustana pardalina / Locusts / migratory behavior / Nomadacris septemfasciata / Orthoptera / Outbreaks / Pest outbreaks / Plague / red locust / Schistocerca gregaria / Schistocerca gregaria flaviventris / Sodium / South Africa / southern African desert locust / Swarms / Very high frequencies / wheat