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DL Situation
Desert Locust Bulletin, No 490, July 2019

Swarms in India and Yemen with more expected

In Southwest Asia, substantial ground control operations are in progress against numerous spring-bred swarms that appeared in Rajasthan, India during July and laid eggs, which hatched and caused hopper groups and bands to form. Smaller operations are underway in adjacent areas of Pakistan. Locust numbers will increase further from widespread hatching in India and a second generation of breeding in Pakistan, giving rise to additional hopper bands in August and adult swarms in September. 

In the Central Region, numerous hopper bands were present in Yemen and new swarms began forming after mid-July. Although control operations have been undertaken in some places, the situation is expected to deteriorate further and more swarms will form in the coming weeks. The unusually heavy rainfall and flooding that fell in July will allow another generation of breeding and further increases in locust numbers in Yemen, which could extend to the Red Sea coast in southwest Saudi Arabia. Last month, at least one swarm migrated from Yemen and reached southern Oman while other swarms arrived in northeast Somalia and probably laid eggs. A few hopper bands formed on the northwest coast of Somalia and small-scale breeding is underway in northeast Ethiopia where hopper groups and a few bands may form. In northern Sudan, adult groups were treated in the Nile Valley while low numbers of mature adults are appearing further south where small-scale breeding will cause locust numbers to increase in the traditional summer breeding areas of the country as well as in the western lowlands of Eritrea during August and September. 

In the Western Region, the situation remains calm. Local breeding occurred in southwest Libya and in parts of Algeria during July, and is in progress in northern Niger. Low numbers of adults began appearing in southeast Mauritania. Small-scale breeding will occur during August and September in the northern Sahel between Mauritania and Chad, causing locust numbers to increase slightly.

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DLIS - 02, Aug 2019
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