Strategies to combat the desert locust.
During the recent plague of Schistocerca gregaria, some 15 × 106l of ULV-formulated pesticide, as well as minor amounts of emulsifiable concn (EC) materials and poisoned bait, were applied, at a cost of US$200 × 106 in donor assistance alone, but to doubtful effect. None of the strategies that aim to prevent plagues are considered likely to succeed. It should, however, be possible to eliminate plagues by relying overwhelmingly on swarm control; the cost would be relatively modest and the risk of a harmful effect on the environment much reduced. This strategy would require, firstly, the preservation or creation of small permanent survey organizations within the recession area; secondly, contingency plans by those countries, by other countries in the invasion area and by donors; and thirdly, a continuous programme of training, especially in ULV locust control methods and campaign organization. At present only FAO can supply the necessary coordination and direction.