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A thick blanket of smog covering parts of Southeast Asia is endangering a crucial army of tiny workers in the palm industry: the weevils responsible for pollinating trees and securing global supplies of the world's most consumed vegetable oil. Experts warn that environmental disruptions are posing a significant threat to long-term output stability.
According to the Indonesian Oil Palm Research Institute (IOPRI), dense smoke and reduced sunlight caused by Indonesia's forest fires are disrupting the activity of pollinating weevils. These insects are vital for carrying pollen from male to female flowers. Historically, such environmental disturbances have been linked to a decline of as much as 20% in the 'fruit set'—the share of flowers that successfully develop into palm fruit—which could once again shrink global oil supplies.
Indonesia is currently battling its most severe fire season in over a decade. The resulting haze has crippled daily life, transport, and agricultural operations. The crisis is being amplified by a powerful El Nino weather pattern, which has extended drought conditions. Scientists worry that the combined adverse impacts on palm yields will begin to manifest significantly by 2027.
This threat of impaired pollination adds substantial risk to an already tight global supply outlook. Beyond environmental factors, Indonesia, the world's leading producer, is increasingly diverting vegetable oil toward biofuel production. This shift tightens the availability for food sectors and risks driving up costs for global consumers. The U.S. Department of Agriculture has already forecast that palm oil stockpiles could drop to a nine-year low during the 2026-27 season.
Agus Eko Prasetyo, a crop-protection researcher at IOPRI, noted that the ongoing haze reduces the weevils' efficiency. During the devastating fires of 2015, Prasetyo observed a sharp decline in weevil activity, likely due to dimmed sunlight and atmospheric changes. 'A plantation may still have an adequate population of pollinating weevils, but pollination efficiency can decline if the insects become less active in moving between flowers,' he explained, adding that the full impact of the current smog remains to be measured.
Data from the 2015 regional haze crisis showed a 5% to 20% reduction in fruit development. Because palm bunches require five to six months to mature following pollination, any yield losses from the current crisis will likely only become visible in harvests around March or April. Researchers at the Malaysian Palm Oil Board also highlighted that impaired pollination can lead to seedless or underdeveloped fruit, resulting in lighter bunches or total crop failure. This translates to lower oil extraction rates and millions in potential lost revenue.
Originally introduced from Cameroon to Malaysia in the early 1980s to replace labor-intensive hand pollination, these weevils have become the most critical biological factor in palm oil production for both Indonesia and Malaysia. With both nations already facing challenges from aging trees and stagnant yields, the synergy of haze-related pollination issues and El Nino-induced water stress may depress productivity long after environmental conditions normalize.
Source: Bloomberg