Desert Locust Bulletin 456 (September 2016) [EN/AR]
General Situation during September 2016
Forecast until mid-November 2016
The Desert Locust situation remained very serious in Yemen during September and there were signs that an outbreak was developing in Mauritania. In Yemen, hopper groups, bands and adult groups continued to form. More adult groups and perhaps a few small swarms are expected and will move to the Red Sea coast, into adjacent areas of Saudi Arabia and perhaps to the Horn of Africa where breeding will cause a further increase in locust numbers. Ground and aerial control operations were carried out in adjacent coastal areas of Saudi Arabia against hopper groups, bands and adult groups. In Mauritania, there was a sudden increase in locust densities in the summer breeding areas, causing adult groups to form. An increasing number of adults and groups subsequently appeared in the northwest and laid eggs. This is expected to develop into an outbreak by mid-October. As vegetation dried out, a few groups also formed in western Mali, northeast Chad and the interior of Sudan. Large numbers of grasshoppers were present in several countries. Elsewhere, the situation remained calm.
Western Region. Scattered locusts were distributed widely throughout the summer breeding areas in the northern Sahel of West Africa because of good rains and green vegetation in September. Adult groups formed in Mauritania, western Mali (mixed with grasshoppers) and Chad. Control operations were undertaken in Mali (810 ha) and Mauritania (263 ha). An outbreak is expected to develop by mid-October in northwest Mauritania where an increasing number of adults and groups appeared during September and laid eggs. There was a report of a very small swarm on the 30th near Nouakchott. In Niger, small-scale breeding occurred on the Tamesna Plains. In Northwest Africa, isolated adults were present in southern Algeria.
Central Region. The situation continued to remain serious in Yemen during September where hopper and adult groups formed in the interior and hopper bands formed on the southern coast. An increasing number of adults arrived on the Red Sea coast and at least one adult group was seen in the highlands moving towards the coast. Only limited survey and control operations could be undertaken due to insecurity. Good rains fell in all areas that will allow more groups, bands and perhaps a few small swarms to form. Most of these are likely to move to the Red Sea coast of Yemen and Saudi Arabia while some could stay in the Yemeni interior and others could migrate to the Horn of Africa. Limited control operations were carried out against hopper groups and bands in eastern Ethiopia and northwest Somalia. Hopper groups and bands and adult groups formed on the southern Red Sea coast in Saudi Arabia, and ground and aerial control operations treated 3,000 ha. In Sudan, hoppers and adults were forming groups at a few places in the Baiyuda Desert north of Khartoum.
Eastern Region. The situation remained calm in the region during September. Only low numbers of solitarious adults were present in Cholistan, Pakistan near the border of India. No signiﬁ cant developments are likely.