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The FAO locust watch on Yemen has this graphic detailing the distribution and development of swarms:
"During the first half of April, several Desert Locust adult groups and swarms formed in at least one area along the southern coast of Yemen between Arkha and Bir Ali. As vegetation dried out, the locusts moved into adjacent interior areas where heavy rains fell recently in Al Jawf, Marib, Hadhramaut, Shabwah and Al-Maharah regions. Consequently, infestations declined on the coast but increased in the interior. On 14 April, there were confirmed reports of at least one swarm and dense groups of adults that were copulating and laying eggs in several wadis on the interior plateau between Thamud and Wadi Hadhramaut. This was followed by additional reports of adult groups at the western end of Wadi Hadhramaut between Al Sor and Al Aber.
The full extent of infestations in the interior is not well known at present due to difficulties in mounting surveys in insecure and remote areas. Nevertheless, there remains a high risk that locust numbers will increase further given the widespread heavy rains that have fallen so far this month in the interior. Breeding is already underway in some areas with hatching expected to commence by the end of April and continue during May when hopper groups and bands are likely to form. New swarms could form in the interior from early June onwards. All efforts should be made to undertake surveys wherever possible and to organize control against the hoppers once they hatch and form groups and bands."
The Guardian reporting: Yemen braces for locust ‘plague’
"But Al-Eryani confirms that there is limited access to locust habitats because of the ongoing conflict jeopardises hopes of dealing with this outbreak.
“Devastating swarms could form undetected in conflict areas and, once they are widespread, it is impossible to control them,” he says."