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DL Situation
Desert Locust Bulletin, No. 489, June 2019

Spring breeding declines but swarms appear in the Horn of Africa

Spring-bred infestations in IranSaudi Arabia and Pakistan declined during June due to drying conditions, increasing temperatures, and intensive control operations that treated more than 300 000 ha. However, locusts increased along the Indo-Pakistan border as early summer breeding continued and several swarms arrived in Rajasthan to lay eggs. Control operations were undertaken in both countries. 

Numerous mature swarms were seen in Yemen where some remained to lay eggs while others crossed the sea to northern Somalia, southern Eritrea and eastern Ethiopia. Some of these swarms could continue moving to the interior of Sudan while others could breed on the northern Somalia coast, in eastern Ethiopia, and on the Red Sea coast in Yemen and adjacent areas in Saudi Arabia because all of these areas received good rainfall in June. 

There remains a moderate risk that small spring-bred swarms may have escaped detection and control in the Arabian Peninsula and could arrive in the summer breeding areas of Sudan to lay eggs during July. Groups of mature adults appeared in the Western Desert of Egypt at the end of June. 

This year’s summer breeding is anticipated to be heavier than normal, resulting in hopper bands and perhaps small swarms developing in several key areas: (a) along the Indo-Pakistan border where two generations may be possible, (b) in Yemenwhere survey and control operations remain limited, (c) in areas of recent rainfall in Ethiopia and northern Somalia, and (d) in the traditional summer breeding areas in the interior of Sudan. In contrast, only small-scale breeding is expected this summer in the northern Sahel of West Africa between Mauritania and Chad.

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DLIS - 04, Jul 2019
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