Desert Locust Bulletin 420 (September 2013) [EN/AR]
General Situation during September 2013
Forecast until mid-November 2013
The Desert Locust situation remained worrisome in Yemen where hopper and adult groups, bands and swarms formed in the interior during September. Only limited control operations could be carried out due to insecurity and beekeeping. Small swarms will form during the forecast period in there areas and move to the Red Sea and Gulf of Aden coasts where adults have already arrived and laid eggs that hatched and hoppers formed groups and bands. Early breeding has also occurred on the central Red Sea coast in Saudi Arabia. Continued breeding caused locust numbers to increase in the northern Sahel between Mauritania and Chad. Small groups could form in some areas as vegetation dries out. A further increase is expected in western Mauritania where breeding will continue during the forecast period.
Western Region. The locust situation continued to remain calm during September. Nevertheless, good rains and small-scale breeding caused locust numbers to increase slightly in Mauritania, Niger and Chad. The situation in northern Mali is likely to be similar but this could not be conﬁrmed due to insecurity and a lack of surveys. In Mauritania, locust adults shifted from the south and southeast to the west and northwest where breeding will occur during the forecast period, causing locust numbers to increase and a few small groups could form. Scattered adults may appear in the Western Sahara. Breeding will continue in October but decline thereafter in northern Mali, Niger and Chad, and locusts will concentrate and could form a few very small groups as vegetation dries out.
Central Region. The situation remained calm during September except in Yemen. Continued breeding led to the formation of hopper and adult groups, bands and swarms in the interior of Yemen. Some of the adults moved to the winter breeding areas along the Red Sea and Gulf of Aden coastal plains and laid eggs that hatched and hoppers formed small groups and bands. Small-scale breeding also caused groups and a few small hopper bands to form on the central Red Sea coastal plains in Saudi Arabia. Low numbers of adults persisted in the summer breeding areas of Sudan, mainly between the Nile River and the Red Sea Hills. During the forecast period, a few groups could form in the interior of Sudan and move to the Red Sea coast where small-scale breeding will commence with the onset of the rains. In Yemen, small swarms will form in the interior and move to the Red Sea and Gulf of Aden coast where breeding will continue and hopper groups and bands are expected to form. Breeding will also continue on central Red Sea coast in Saudi Arabia.
Eastern Region. The situation remained calm during September. Low numbers of solitarious adults persisted in a few places of the summer breeding areas along both sides of the Indo-Pakistan border. As the monsoon rains have ended, no signiﬁcant developments are likely during the forecast period.