Locust Plagues and Their Devastation

Desert Locust Biology and Plague Formation

Desert locusts (Schistocerca gregaria) have one of the most dramatic biological transformations in the animal kingdom. Under normal conditions, locusts live as solitary insects, relatively innocuous to agriculture. But when rainfall creates unusually lush vegetation in desert breeding areas, locust populations explode. At a critical population density, the insects undergo a phase transformation: solitary locusts become gregarious locusts, changing in color, body shape, behavior, and flight tendency. They aggregate into bands as hoppers, then form airborne swarms as adults. A large swarm can number ten to one hundred billion individuals and cover hundreds of square kilometers. The swarm can consume vegetation equal to its own weight each day.

The darkening effect of a large swarm approaching is not biblical hyperbole. Modern observers of major Schistocerca swarms report that the swarm blocks sunlight and creates midday darkness. The wind-driven movement of a swarm - locusts fly with prevailing winds, descending on whatever vegetation lies in their path - creates an almost unstoppable agricultural catastrophe. A field stripped by locusts in a single day may have supported a family's grain supply for an entire year.

Archaeological Evidence

Locust plague documentation extends into ancient Near Eastern texts. Egyptian administrative records from the New Kingdom mention locust swarms as periodic agricultural threats. Assyrian annals and correspondence document locust invasions disrupting agricultural production in subject territories. Modern analysis of locust breeding cycles has identified the Arabian Peninsula, East Africa, and the Sudan as the primary source regions, with swarms moving into the Levant when wind and moisture conditions align.

Joel's four Hebrew terms for locust stages or species - gazam (gnawer), arbeh (multiplier), yeleq (licker), hasil (consumer) - may represent either four distinct species in the Acrididae family or four developmental stages of a single species (egg-pod, hopper, winged adult, and swarming adult). Entomological analysis supports the developmental-stage interpretation, and all four terms appear in the Septuagint with specific translation choices suggesting the Greek translators understood the distinction.

Biblical Passages

The eighth plague on Egypt (Exodus 10:4-15) describes locust devastation with precise agricultural observation: 'they covered the face of the whole land, so that the land was darkened, and they ate all the plants in the land and all the fruit of the trees that the hail had left. Not a green thing remained, neither tree nor plant of the field, through all the land of Egypt.' The detail about eating what the hail (seventh plague) had left shows the plagues are described as cumulative agricultural devastation.

Joel 1-2 provides the most extended biblical treatment of a locust plague, so vivid in its detail that it likely reflects a real event experienced by the prophet's community. Joel 1:4 names the four stages consuming in sequence: 'What the cutting locust left, the swarming locust has eaten. What the swarming locust left, the hopping locust has eaten, and what the hopping locust left, the destroying locust has eaten.' The prophet then maps the agricultural damage: vine, fig, pomegranate, palm, apple - orchard crops stripped bare. The grain offering and drink offering cease because there is no grain and no wine.

Joel 2:1-11 then shifts into apocalyptic poetry, using the locust swarm as a metaphor for an invading divine army: 'Their appearance is like the appearance of horses, and like war horses they run. As with the rumbling of chariots, they leap on the tops of the mountains... Before them the earth quakes; the heavens tremble. The sun and the moon are darkened, and the stars withdraw their shining.' Revelation 9:7-9 draws on this Joeline imagery directly for the demonic locusts of the fifth trumpet.

Dead Sea Scrolls Evidence

The War Scroll (1QM) uses locust imagery from Joel in describing the eschatological battle, confirming that the locust-as-divine-army metaphor was active in Second Temple apocalyptic thought. The Temple Scroll's agricultural regulations treat locust damage alongside drought and blight as circumstances affecting tithe and offering obligations - confirming that locust plague was a recognized agricultural category requiring legal provision, not merely a rare catastrophe.

Parallel Cultures

Assyrian royal correspondence from Nineveh (7th century BCE) includes administrative reports on locust swarms disrupting provincial agriculture, requesting royal instructions. Egyptian texts from the Middle Kingdom onward document locust plagues. The Amarna letters (14th century BCE) from Canaanite city rulers to the Egyptian pharaoh include a report of locust damage to agricultural lands.

Herodotus (4.172) and Diodorus Siculus (3.29) both describe peoples whose diets depended heavily on dried locusts as a protein source, confirming that locust consumption was both widespread and recognized as an adaptation to locust plague conditions. When a swarm descended, the rational response for those unable to stop it was to harvest the locusts themselves.

Scholarly Sources

The ISBE article on 'Locust' provides the lexical and biological background. For Joel's plague, Leslie Allen's Joel commentary in the Word Biblical Commentary series (1976) provides the most detailed analysis. The UN Food and Agriculture Organization's publications on desert locust biology and plague dynamics provide modern entomological context. For the consumption dimension, Gene DeFoliart's work on edible insects in the Annual Review of Entomology is standard.

Modern Misconceptions

A common misconception is that ancient peoples were helpless observers of locust swarms and could do nothing. In fact, communities developed practical responses: smoking fields, building fire barriers at field edges, digging trenches to trap hoppers before they gained flight, and harvesting the locusts themselves for food. Joel's prophetic message - 'Return to the LORD' - was the theological response, not a claim that human effort was meaningless. Joel's call to communal fasting and prayer (2:15-17) envisions a community response that combined practical urgency with theological acknowledgment of dependence on God's intervention.

• ISBE: Locust
• Borowski, Agriculture in Iron Age Israel, pp.14-22
• Zohary, Plants of the Bible, pp.96-98