The Delhi government on Thursday issued an advisory on preventive measures to control a probable locust attack in the national capital. It called for organising awareness programmes for the public and farmers to prevent the attack of swarms of locusts in the national capital territory. It said that since the swarms usually fly during the day and rest at night, they should not be allowed to rest. The advisory asks concerned authorities to spray insecticide as needed. The locust swarms which first attacked Rajasthan have now spread to four other states - Punjab, Gujarat, Maharashtra and Madhya Pradesh.