Sixty-six years after his death, the legacy of Arthur V. Dias—known as Kos Mama for promoting jackfruit cultivation—takes on fresh urgency as meteorologists warn of an El Niño threatening Sri Lanka's monsoon-dependent harvests and rice-reliant food system.

Arthur Vincent Dias, who died on 31 July 1960, is remembered across Sri Lanka not through monuments or official honours but through the jackfruit trees he persuaded the nation to plant more than a century ago. Born into one of colonial Ceylon's wealthiest families in 1886, Dias rejected the comfort of his inheritance—his father had made a fortune in the arrack trade—and instead devoted himself to agrarian reform and national development. After inheriting the family's liquor business, he persuaded his mother to close the taverns entirely and redirected workers to the estates, establishing an early pattern of principle pursued without abandoning those it affected.

Dias emerged as a key figure in the Temperance Movement, working alongside nationalist leaders including Anagarika Dharmapala. His convictions nearly cost him his life: he was arrested during the 1915 communal riots and sentenced to death before his mother secured his release by bringing in a lawyer from India. Standing in Kandy afterward, he pledged his remaining years to the nation's welfare. It was the First World War that transformed him into what history would remember as a prophet. Understanding that Ceylon's dependence on imported rice made the country vulnerable to wartime supply disruptions, Dias identified the jackfruit tree as a solution—a crop that would thrive across diverse terrain, provide nutrition at multiple stages, and offer security against hunger without requiring replanting or heavy water inputs.

Launching his campaign on 11 June 1918 under the motto "Jack is good for food and wood," Dias employed methods that anticipated modern programme design: he studied the problem systematically, tested solutions in his own garden, built stakeholder networks district by district, and distributed over a million seeds through the colonial postal service. He drove across the island delivering saplings, reached as far north as Jaffna, and used every available channel—radio, newspapers, temple sermons, school functions—to spread the message. Throughout his life, he declined honours including a British knighthood and a senate seat from Prime Minister S.W.R.D. Bandaranaike, maintained strict personal discipline by eating only jackfruit and breadfruit at his own table, and quietly funded education for gifted children unable to afford it.

As Sri Lanka faces an El Niño strengthening in the Pacific in 2026, with meteorologists warning of probable drought conditions affecting the monsoon, Dias's century-old strategy demands renewed attention. The country still derives over 40 percent of its calories from rice, a crop vulnerable to the monsoon disruptions an El Niño typically brings. Previous droughts in 2016–17 and 2023 left significant portions of paddy land unharvested and devastated farming communities. By contrast, jackfruit trees—once established, drought-tolerant, and already covering roughly 125,000 acres across the island—offer resilience: they require no replanting, survive dry spells that devastate paddy fields, and deliver comparable protein to rice with triple the dietary fibre, plus calcium, iron, and vitamin C. Peer-reviewed research has since confirmed traditional pharmacological uses of jackfruit leaves, seeds, and flesh, documenting antioxidant, antifungal, antiviral, and anti-diabetic properties. Yet approximately 70 percent of the annual harvest rots unharvested, with per capita consumption running far below production capacity.

The Institution of Food, working with the Sri Lanka Medical Nutrition Association, now frames jackfruit as a test case for converting a long-dismissed "poor man's food" into a branded, processed staple capable of addressing both food security and non-communicable disease prevention. Dehydrated products, frozen preparations, seed flour, and institutional menu adoption could convert seasonal gluts into year-round reserves while generating export value. Sixty-six years after Dias's death, his deeper contribution emerges not as a single innovation but as a method: study crisis before it arrives, choose the most achievable and useful remedy, prove it personally, then pursue the patient, unglamorous work of implementation without seeking recognition. As the Pacific warms again and the same vulnerability surfaces, this year's anniversary offers Sri Lanka not ceremony but a call to repetition.