The Desert Locust situation continued to improve during April along both sides of the Red Sea due to control operations and drying conditions in Sudan, Eritrea and Saudi Arabia.
Adult groups moved into the interior of Saudi Arabia where one generation of breeding is expected. Several swarms moved from northwest Somalia into eastern Ethiopia where, despite aerial and ground control operations, breeding is likely to occur and hopper bands could form during the forecast period. Smaller-scale breeding occurred in northern Oman and southeast Iran, causing small hopper groups to form. Unusually dry conditions prevailed in Northwest Africa.
Western Region. The situation remained calm during April. No signifi cant rain fell in the spring breeding areas south of the Atlas Mountains in Northwest Africa. Consequently, ecological conditions remained unfavourable and only isolated solitarious adults were seen in northeast Morocco. Dry conditions prevailed in the northern Sahel of West Africa. No signifi cant developments are expected.
Central Region. Locust infestations continued to decline in winter breeding areas along both sides of the Red Sea due to control operations and drying conditions. Aerial and ground control operations were carried out in Saudi Arabia, and adult groups moved into the spring breeding areas of the interior where they laid eggs. In northeast Sudan, adults formed groups and a few small swarms that were treated by ground teams. Control operations finished in Yemen and Eritrea. In Yemen, small-scale breeding may occur in the interior, causing locust numbers to increase slightly. Numerous swarms moved from northwest Somalia to eastern Ethiopia where aerial and ground control operations were undertaken, and hatching and the formation of hopper groups and bands are expected in May. Small-scale breeding is in progress and is likely to continue in northern Oman where small hopper groups formed. As vegetation dries out, locusts may form more small groups.
Eastern Region. The situation remained calm in April. Small-scale breeding was in progress in coastal and interior areas of southeast Iran and limited control operations were undertaken. During the forecast period, hatching will cause locust numbers to increase slightly. As vegetation dries out, small groups may form. Although locusts were not seen in adjacent areas of western Pakistan, small-scale breeding may occur in May
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