India, the world's biggest exporter of red chillis, shipped out 578,800 tonnes in 2021, up nearly 8 per cent from a year ago.
Bangladesh, China, Indonesia, Malaysia, Nepal, Sri Lanka, Thailand and the United States accounted for the bulk of its exports of $1.3 billion in 2021.
Chilli plants were badly hit by thrips and the infestation spread despite heavy use of pesticide, said Mahankal Rao, a 46-year-old farmer, who planted the crop on his two-acre farm at Guntur in Andhra Pradesh.
"For me, yields were lower, despite heavy use of pesticides, but some farmers gave up and didn't use pesticides," said Rao, who has been planting chillies for nearly three decades.
The invasive pest species Thrips parvispinus must be tackled quickly but many farmers abandoned affected fields, allowing it to spread, said a senior agronomist at the Indian Council of Agricultural Research.
Farmers have now been reporting lower yields as the pest caused large-scale shedding of flowers, malformation of fruit and fruit drops, he said.
Farmers have completed harvesting but are going slow on releasing the crop into the market, said Alepata Srinivas Rao, a trader based in Guntur.
"Farmers know supplies are limited and they are anticipating further price rises, so they are delaying sales," Rao said.
Wholesale prices in India's biggest spot market of Guntur have risen to 18,000 rupees ($234) per 100 kg from about 10,000 rupees in November.
Indian spices companies worried about supplies have been making aggressive purchases in the past few months, which also aided prices, said APJ Arun, an exporter in Guntur.
But export demand will determine the price trend in coming months, said Arun, adding, "We need to see how buyers react to higher prices."
Though prices are high, overseas buyers cannot replace Indian chillis with those from any other origin, said trader Kanungo.
"No one has a massive surplus to replace Indian supplies," he said. "And for buyers, taste is also important. Other origins don't offer the same flavour."
Chilli production in Pakistan, another exporter, has also fallen because of erratic weather, traders said.