Climate change impacts on the life-cycle phenology of rice planthoppers (Hemiptera: Delphacidae) in East Asia from 1980 to 2022.
Mochizuki R, Sanada-Morimura S, Maruyama A
Climate Adaptation
Rice paddies across East Asia are losing a natural buffer that once slowed pest cycles — and that compression is already measurable over a 42-year record, not a future projection.
Scientists tracked two tiny sap-sucking insects that attack rice plants in Japan over 42 years and found that warming temperatures are causing them to grow up faster. When insects develop more quickly, they can produce more generations in a single growing season, meaning more damage to crops. This makes it harder for farmers to know exactly when to apply treatments, and could lead to bigger outbreaks if pest management timing falls out of sync with the insects' accelerated schedule.
Key Findings
Daily mean temperatures in Kyushu, Japan rose at a rate of 2.2–4.5 × 10⁻² °C per year between 1980 and 2022.
Developmental periods for both brown planthopper and white-backed planthopper showed a statistically significant shortening trend over the 42-year study (P < 0.01).
Temperature and developmental period length were strongly correlated (P < 0.001), directly linking warming climate to faster insect life cycles.
chevron_right Technical Summary
Rice-feeding insects in Japan are developing faster as temperatures rise, compressing their life cycles and likely increasing the number of generations per growing season — raising the risk of larger, harder-to-time pest outbreaks on rice crops.
Abstract Preview
Alterations in pest ecology due to climate change can affect crop production. Understanding the rate and period of pest development is essential for predicting population dynamics and determining t...
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