Crop losses due to outbreaks of Mastomys natalensis (Smith, 1834) Muridae, Rodentia, in the Lindi Region of Tanzania

In 1989, a widespread outbreak of the multimammate rat—Mastomys natalensis (Smith, 1834) occurred in the Lindi Region in southern Tanzania. Population densities of the rodent were estimated in some areas to be over 1400 ratsha−1. Crop loss due to the outbreak was evaluated in the region. A total yield loss of 48% of maize, sorghum, paddy, and pulses that were in production during the 1989/90 crop season was attributed to seed depredation by the rats. The Tanzanian government spent about US$16,000 on a rodent-control campaign in this region. Food losses due to rodents required the government to supply relief food to residents threatened by famine.