Hundreds of billions of locusts swarm in East Africa

Hundreds of billions of locusts are swarming through parts of East Africa and South Asia in the worst infestation for a quarter of a century, threatening crops and livelihoods.

A man holds a stick to fend off a swarm of desert locusts Image copyright Reuters
Image caption A man attempts to fend off a swarm of desert locusts at a ranch near the town of Nanyuki, in Laikipia county, Kenya
Samburu men attempt to repel locusts Image copyright Reuters
Image caption Men try to repel locusts flying over grazing land in Lemasulani village, Samburu county, Kenya

The insects, which eat their own body weight in food every day, are breeding so fast numbers could grow four hundredfold by June.

Newly-hatched desert locusts are seen on a tree with people looking on Image copyright Reuters
Image caption A swarm of newly hatched desert locusts are seen on a tree as men look on, near the town of Archers Post, Samburu county

In January, the UN appealed for $76m (?59m) to tackle the crisis.

That figure has now risen to $138m.

A man walks by locusts on the ground Image copyright Reuters
Image caption A man walks by locusts in the region of Kyuso, Kenya

But so far, only $52m has been received, $10m of which has come this week from the Bill & Melinda Gates Foundation.

Soldiers spray trees with insecticides Image copyright AFP
Image caption Uganda Peoples Defence Forces soldiers spray trees with insecticides in Otuke

The main threats are in East Africa and Yemen, as well the Gulf states, Iran, Pakistan and India.

Two stalks of sorghum seeds Image copyright Getty Images
Image caption A stalk of sorghum seeds partially eaten by locusts (left) is held next to an undamaged stalk in Nairobi, Kenya
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Swarms of locusts feed on shea trees Image copyright AFP
Image caption Swarms feed on shea trees, an important source of food and income for local farmers, in Otuke

Most recently, locusts have been seen in the Democratic Republic of Congo and swarms have arrived in Kuwait, Bahrain and Qatar and along the coast of Iran.

A soldier prepares equipment to spray crops Image copyright Getty Images
Image caption A UPDF soldier prepares pesticide equipment in Katakwi
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A soldier sprays plants with insecticides Image copyright AFP
Image caption A UPDF soldier sprays plants with insecticides in Otuke

Aerial and ground spraying combined with constant tracking of the swarms are viewed as the most effective strategies.

But Desert Locust Control Organization for Eastern Africa head Stephen Njoka told BBC 1593太阳集团城一切网址 aircraft were in short supply.

Currently, Ethiopia was using five and Kenya six for spraying and four for surveying, he said.

A woman holds a plastic bottle filled with locusts Image copyright AFP
Image caption A woman holds a plastic bottle filled with locusts in Lopei, Uganda

But the Kenyan government says it needs 20 planes for spraying - and a continuous supply of the pesticide Fenitrothion.

A soldier holds a locust Image copyright AFP
Image caption A UPDF soldier holds a locust in Otuke
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A hand holds a desert locust Image copyright Getty Images
Image caption A desert locust is held in Katakwi

Kenya has trained more than 240 personnel from affected counties in monitoring of locust swarms.

A man runs through a desert locust swarm Image copyright EPA
Image caption A man runs through a desert locust swarm in the bush near Enziu, Kitui county, about 200km (124 miles) east of the capital, Nairobi

The Chinese government announced in February it was sending a team of experts to neighbouring Pakistan to develop "targeted programmes" against the locusts.

According to reports, they could deploy 100,000 ducks.

Locusts swarm across a highway Image copyright AFP
Image caption Locusts swarm across a highway at Lerata village, near Archers Post, about 300km north of Nairobi
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A local tour guide holds a handful of dead desert locusts Image copyright EPA
Image caption A local tour guide holds a handful of dead desert locusts in Shaba National Reserve in Isiolo, northern Kenya

Lu Lizhi, a senior researcher with the Zhejiang Academy of Agricultural Sciences, told Bloomberg the ducks were "biological weapons".

And while chickens could eat about 70 locusts in one day, a duck could devour more than three times that number.

"Ducks like to stay in a group, so they are easier to manage than chickens," he told Chinese media.

A desert locust swarm flies over a bush Image copyright EPA
Image caption A desert locust swarm flies over a bush in Ololokwe, Samburu county

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