Photo taken with mobile phone on Feb. 15, 2020 shows Pakistani children trying to avoid locusts swarming in Okara district in eastern Pakistan's Punjab province. Locust attack on crops incurred heavy financial losses to farmers in some areas of the country. (Str/Xinhua)

Photo taken with mobile phone on Feb. 15, 2020 shows Pakistani children trying to avoid locusts swarming in Okara district in eastern Pakistan's Punjab province. Locust attack on crops incurred heavy financial losses to farmers in some areas of the country. (Str/Xinhua)

Photo taken with mobile phone on Feb. 15, 2020 shows a farmer riding a cart as locusts swarming in Okara district in eastern Pakistan's Punjab province. Locust attack on crops incurred heavy financial losses to farmers in some areas of the country. (Str/Xinhua)

Photo taken with mobile phone on Feb. 15, 2020 shows Pakistani farmers trying to avoid locusts swarming in Okara district in eastern Pakistan's Punjab province. Locust attack on crops incurred heavy financial losses to farmers in some areas of the country. (Str/Xinhua)

Photo taken with mobile phone on Feb. 15, 2020 shows a farmer displaying a locust in Okara district in eastern Pakistan's Punjab province. Locust attack on crops incurred heavy financial losses to farmers in some areas of the country. (Str/Xinhua)