Hatching & band formation on Pakistan coast from earlier than previously reported swarm
New information indicates that the small mature swarm reported on 3 August on the coast of Pakistan in the Uthal area west of Karachi probably arrived at least one week earlier than previously thought.
In recent interviews, locals say they saw a mature swarm on 27 July. Prior to that, ground surveys did not detect any swarms on 16-21 July. Currently, hatching is in progress in the Uthal area and first and second instar gregarious hoppers are present. These facts suggest that at least one swarm departed from eastern Yemen on about 18-23 July and migrated for four days on strong southwesterly monsoon winds over the Arabian Sea, arriving on the coast of Pakistan about 22 July or shortly thereafter. Upon arrival, the swarm dispersed, mixed with local solitarious hoppers and adults, copulated and laid eggs that hatched from 3 August onwards. So far, ground teams have treated 220 ha. Some adults from the swarm have continued northeast to the Indus Valley where they were seen near Sukkur on 10 August.
A few more small swarms may appear in the Uthal area or along the Indo-Pakistan border but it is difficult to say with precision as the current situation in Yemen remains unclear. Increased vigilance is required in Tharparkar, Nara and Cholistan deserts of Pakistan and in West Rajasthan, India.
In addition, there remains a low risk that a few small swarms from Yemen could also appear at times in adjacent areas of Saudi Arabia and Oman or move to northern Somalia, Djibouti, Ethiopia and Eritrea. All of these countries should remain extremely vigilant during August and September.