The Delhi government today warned of a possible locust attack and asked authorities to spray insecticides and pesticides on crops, vegetation, gardens and orchards.India is battling the worst desert locust outbreak in recent times. Swarms of locusts first attacked Rajasthan and have now spread to Punjab, Gujarat, Maharashtra and Madhya Pradesh.”As the swarm of locusts flies in daytime, and rests during the night, it should not be allowed to rest at night,” said an advisory by Delhi Agriculture Department officer AP Saini.