Locust Warning Organisation said several teams are working in Rajasthan to control new swarms coming in.
Since Thursday, social media messages have been warning “those in Delhi-NCR” to shut their doors and windows tightly.
Several successive waves of invasions can be expected until July in Rajasthan, FAO said in an update.
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A one square km swarm contains about 40 million locusts, which can eat the same amount of food in a day as about 35,000 people.
Locust attacks are not new to Western Rajasthan but reports say this is the first time since early 1990s that swarms have made their way into Jaipur.