In 1869, Donald Reid, superintendent of the Galloola estate, noticed leaves turning yellow. The estate lay in the Madulsima district, in Uva, in eastern Ceylon. Samples were sent to George Thwaites, director of the Peradeniya botanical garden, and then to London.

The description, however, was made far from the diseased trees. On November 6, 1869, in The Gardeners' Chronicle, a horticultural weekly, the Reverend Miles Berkeley and Christopher Broome described the fungus and named it Hemileia vastatrix. Berkeley was a mycologist, and he had never seen the disease in the field.

The name is already a diagnosis. “Hemileia” refers to the half-smooth surface of the spores, “vastatrix” means the devastator. It was coined before anyone had seen the scale of what was beginning. Colonial officers, for their part, called it “Devastating Emily”.

The date of discovery is not settled for all that: Barat places it in 1868, McCook in 1869. And the disease had been seen as early as 1861 by a British settler, on wild coffee plants near Lake Victoria, hence before the Ceylon episode.

McCook 2019, p. 1, 36 and 43; historyofceylontea.com, “The Collapse of Coffee in Ceylon, c. 1869-1890” (2026); BSPP 2022, p. 3; Coste 1955, p. 224; LC ch. 12

For ten years, planters and agents blamed the disease on poor vigor and on humidity, and tried to strengthen the trees. The Ceylon government did not set up a commission until 1879, and London sent a young botanist, Harry Marshall Ward, who worked on the island from 1880 to 1882. Ward established the causal link between the fungus and the disease (published in 1882), described the life cycle, demonstrated that the spores travel by wind and that continuous monoculture sustains the epidemic; he recommended no longer planting a single variety, multiplying the types of coffee and leaving belts of trees between plantations.

This advice arrived on an island where nearly every available acre already carried the same coffee plant and where native species had been cleared: it was not followed. Ward became professor of botany at Cambridge in 1895 and ranks among the founders of plant pathology as a discipline; coffee rust is its first great textbook case.

Wikipedia, “Harry Marshall Ward”, accessed 09/07/2026; BSPP 2022, p. 3-4 (Ward 1882; Ayres 2005); LC ch. 12

The figures come from people who were writing during the collapse, as it unfolded. They count as dated testimonies, not as a statistic reconstructed after the fact.

• Thurber, 1881A record yield of 616 pounds per acre in 1870, or about 690 kg/ha, above the 400-600 kg/ha that Coste would give as the norm in 1955. It was never seen again. In the 1878-79 season alone, the loss reached 26 million rupees. And more than 30 million pounds sterling had been paid out up to 1877 in wages to workers brought from southern India.
• Walsh, 1894Around 1880, the island had a thousand plantations, produced 80 million pounds at 400 pounds per acre, and had absorbed 70 million dollars of investment.

The overall movement says more than any single figure. The planted area rose from about 176,000 acres in 1869 to 275,000 in 1879, an increase of 50%. Over the same period, yield fell from 4.5 to 2 English hundredweights per acre. More and more was being planted to harvest less and less per hectare.

The end is clear. Exports peaked at a little over one million hundredweights around 1870, then fell below 100,000 in the 1890s. The coffee area itself fell from 68,787 ha to 14,170 ha.

Thurber, Coffee: from Plantation to Cup (1881), p. 92-94 and 98; Walsh, Coffee: its History, Classification and Description (1894), p. 125-128; McCook 2019, p. 44; historyofceylontea.com (2026); BSPP 2022, p. 5 (Waller et al. 2007); LC ch. 12

Planting more while yields collapsed was not blindness. Three reasons held together. Each planter was arithmetically compensating for a decline he did not control. He was then protecting the value of the security given to his bank. And he was betting, for lack of knowledge, on a disease that would pass like a bad season.

The calculation held up at the scale of a farm and was disastrous at the scale of the island. Each new hectare fed an obligate parasite, which lives only on living tissue and found its reserve there. It pushed cultivation toward slopes and lower altitudes, hence warmer ones. And it multiplied the shipments of plants and people, that is, the vehicles of the spore. It is a positive feedback loop: the remedy fed the evil.

Ceylon became a tea island. The cleared land, the roads, the ports and the capital were already there; they carried a different leaf, with James Taylor and then Thomas Lipton.

On the significance of this shift, the sources differ. For 1894, Walsh gives a United Kingdom consuming less than one pound of coffee per head against six to eight pounds of tea, and the Livre café sees an industrial reorientation in it. The BSPP, on the contrary, judges that no evidence links the collapse of Ceylon to the dominance of tea in Great Britain, since imports from elsewhere may have compensated.

McCook 2019, p. 44; Walsh 1894; BSPP 2022, p. 4-5; LC ch. 12