Locusts, locust attacks: India
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A history of locust attacks
1879-1939
Vikram Doctor, This common enemy has united India and Pakistan, February 8, 2020: The Times of India
Even during the worst hostilities, both countries worked together to tackle an enemy that has resurfaced again — locusts
‘This morning the trees are almost denuded and the locusts, hanging on the twigs and branches, appear to have changed the colour of the foliage, for the tops of the trees seem covered with a yellow blight, which on close inspection turns out to be locusts…”
That description, from a Times of India report from 1902, describing the devastation of mango orchards in Trombay, near Bombay, is a reminder of how terrifyingly transformative a locust attack can be. It is now being experienced in districts of Punjab in both Pakistan and India, an ancient plague that seems, mystifyingly, to have come to life again.
Locust swarms were once so common that TOI carried very detailed reports about them. In 1879, a correspondent noted the cruel way in which they followed other disasters: “In the famine districts these winged armies made a clean sweep of all the vegetation for miles around, while the moral effect of their presence upon a famine-struck population was so great that the population completely lost heart and ceased to try and battle…” So sudden and punishing are the attacks that is not surprising that they have commonly been given a divine interpretation, like the swarms that formed one of the plagues of Egypt in the Bible.
STEEDS OF SHIVA
In 1929 ,TOI noted that in some districts locusts were called the horses of Mahadev (Shiva) and “were actually caught alive, treated with utmost respect, offered the best of food, worshipped with due reverence.” The belief was that “if the wrath of the god has been appeased and his depredatory appetite satisfied, then the avenging army received marching orders…”
The British might have sneered at these beliefs, but their more vigorous responses to locusts didn’t seem to do much good either. In 1899, TOI reported the police superintendent of Panch Mahals, Mr R P Lambert, firing blank guns to scare away swarms.
A suggestion from 1929 to use aircraft to control locusts was abandoned because it seemed more likely to kill the pilots as their engines clogged with the insects. One correspondent admitted that the main satisfaction of another solution, tar-coated screens, was watching the insects struggle and die, but it made little difference to the huge numbers.
LOCUST ROAST WITH GHEE
Perhaps the only solution was the natural one noted by the writer in 1879: feast on them like the birds and animals do. It was suggested that even humans could do the same: “Pull off the legs and wings and roast with a little ghee in an iron dish, adding curry powder, pepper and salt to taste… locusts are said to be in flavour not unlike shrimp,” Eating locusts is, in fact, a common survival strategy in places ravaged by them, simply because there is little else left. The Hebrew scriptures specify that, unlike other insects, the locust is kosher to eat.
Entomologists had always been mystified by the way locusts suddenly seemed to swarm out of nowhere, and it was Russian entomologist Sir Boris Uvarov who made an important connection in 1921. Locusts and grasshoppers were the same species, but under stressed conditions of drought and diminishing food, grasshoppers laid eggs that became locusts. These locusts could swarm and fly far off in search of food and, when this was found in abundance again, future generations could revert to being solitary grasshoppers.
This insight transformed locust control because now field workers could look for conditions in which grasshoppers were getting stressed and transforming into locusts — and if these were controlled, the larger swarms might never form.
Insights like these led the British to set up a Locust Warning Organisation (LWO) in 1939, to focus on the most vulnerable areas for locusts like the semidesert parts of Rajasthan, Gujarat and Punjab. Remarkably, LWO’s work survived Partition and continued to function even through the worst years of Indo-Pak hostilities.
In a tacit acceptance that insects don’t recognise national boundaries, locust hunters in both countries have co-ordinated with military authorities like the Border Security Force to set up regular meetings at border points like Munabao and Khokrapur, and even exchange information by wireless about the sighting of swarms.
The reasons for the current swarms still need to be analysed, but it should be noted that they are part of a pattern of recent outbreaks in countries like Somalia and Yemen where civil war and attacks by militarised groups is preventing effective implementation of any kind of monitoring and control efforts, as well as exacerbating general famine conditions.
This is a fairly direct example of how failures in governing can lead to the return of plagues once thought long past. When combined with evidence from Australia that their locusts are becoming increasingly adapted to the hotter and drier conditions created by climate change, it seems that the Indian description of them as the deadly horses of Shiva, the Lord of Destruction, may seem all too relevant again.
2020
Jan 21, 2020: The Times of India
From: Jan 21, 2020: The Times of India
From: Jan 21, 2020: The Times of India
From: Jan 21, 2020: The Times of India
NEW DELHI: Rajasthan is facing its worst locust attack in six decades with the insects attacking crops spread over an area of around 3.60 lakh hectares. Sriganganagar is the hardest hit district with parts of Jaisalmer, Bikaner, Jalore, Jodhpur, Barmer, Sirohi, Churu, Nagaur and Hanumangarh also affected. The first attacks were reported in May last year, when lakhs of locusts flying in from southern Pakistan damaged the kharif crop (July-Sept). Now, a major wave has hit the rabi crop. A look.
What are locusts?
Locusts are short-horned insects belonging to the same order as crickets and long-horned grasshoppers. Such insects can be easily identifi ed by their large hind legs that enable them to jump. These insects are usually solitary, but under certain circumstances, they become abundant and gregarious. The last locust outbreak was in Rajasthan was reported in 1993 and had covered 3.1 lakh hectares.
...They’re dangerous when form a swarm
Migratory locusts have the largest distribution area among all locusts and grasshoppers worldwide, virtually covering all temperate, tropical regions.
When do they turn dangerous?
It’s in the gregarious phase that locusts form swarms that can be devastating to crops and pasture. They enter this phase if there is sufficient rainfall that ensure enough vegetation for the young ones, and the ground is moist for egg development.
How much do they eat?
A locust adult can consume roughly its own weight in fresh food per day, that is about 2 gm daily. A 1 sqkm sized swarm has 40 million locusts, which eat the same amount of food in one day as about 35,000 people.
What do they eat?
Locusts devour leaves, flowers, fruits, seeds, tree bark and shoots. Their swarms can also destroy plants due to their sheer weight as they descend on them in massive numbers.
How long do they live?
The life cycle of a locust consists of the egg, nymph and adult stage. The eggs take about two weeks during favourable conditions to hatch into nymphs. Both nymphs and adults are feeders. However, the nymphs (also known as hoppers) do not have wings and become adults 30-40 days after hatching. The young adults take about three weeks before they are ready to mate and lay eggs. Adult locusts live for between three to five months.
Why desert locusts are difficult to contain
Locusts can be found in an extremely large area (16-30 million sq. km), which are often remote and difficult to access. There are limited resources for locust monitoring and control in some of the affected countries.
How to fight them?
Traditional means of control are based on the use of insecticides from the ground or the air, but other methods using biological control are proving effective.
