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close this book Locust handbook
close this folder 3. Other African locusts
View the document African migratory locust-Locusts migratoria migratorioides
View the document Other subspecies of Locusta migratoria
View the document Red locust-Nomadacris septemfasciata
View the document Brown locust-Locustana pardalina
View the document Tree locusts-Anacridium melanorhodon melanorhodon, Anacridium melanorhodon arabafrum, Anacridium wernerellum, Anacridium aegyptium

Other subspecies of Locusta migratoria

Figure 108 shows the widespread distribution of this species. Nine subspecies have so far been distinguished. The Locusta found in Arabia and India is very similar to the African subspecies but forms swarms much less frequently and except for India is a relatively minor pest. In Madagascar Locusta is regarded as the most important agricultural pest, especially of rice and sugarcane. There can be four generations in a year: one in the dry season and three in the rainy season. Development is continuous so that all stages can be found at the same time. Plagues last 1-3 years (last plague was 1960-1961) and follow periods of above average rainfall. Recession periods are much longer. The main outbreak area is in the southwest corner of the island where Locusta is concentrated by the North East Trade Winds into marshy areas suitable for breeding.

Locusta m. manilensis is described in Chapter 5 and the other subspecies are outside the area covered by the handbook.

 


Fig. 108. Distribution of the subspecies of the Migratory Locust.