Exposure even to low levels of imidacloprid, a widely used pesticide, can harm the central nervous system of bees and may be a reason behind the global bee colony collapse, a National Taiwan University research team said yesterday in Taipei.
Reports from around the world in recent years have shown that the population of wild bees has rapidly declined in many parts of the world. As bees contribute to the pollination of many crop species, ensuring production of seeds in many flowering plants and playing an important role in the ecosystem, many scientists are concerned about the rapid decline in bee colonies.
The university formed an interdisciplinary research team in 2008 to study whether the collapse was caused by the prevalent use of pesticides. A special method that the team developed — putting a tattoo on experimental bees — was applied to track the bees and observe the effects of insecticides on them.
National Taiwan University entomology professor Yang En-cheng (楊恩誠) said researchers discovered that imidacloprid — an insecticide belonging to a class of chemicals called the neonicotinoids — can cause worker bees to lose their way back to their hives.
“Normally, worker bees fly back to their hives when they have suck enough nectar, but when they consume up to about 50ppb [parts per billion] of imidacloprid, they stay on the flower, rubbing their eyes. We can see that they are uncomfortable, and they don’t fly back immediately,” Yang said.
Moreover, the team observed that even exposure to low levels — or just 10ppb — of imidacloprid can cause harm to bee larvae, depriving them of their ability to form and retain memories as they grow, thus contributing to the decline of the bee population.
The use of imidacloprid on certain crops was banned by the EU last year, but it is still widely used in Taiwan, Yang said.
While Taiwan earns about NT$2.3 billion (US$76 million) from honey each year, the government should evaluate whether it should limit the use of imidacloprid and other neonicotinoids, he said.
NEW AGREEMENT: Malaysia approved imports last year after nearly two years of negotiations and inspections to meet quarantine requirements, officials said Up to 3.6 tonnes of pomeloes from Taiwan cleared Malaysian customs on Friday, in the first shipment of Taiwanese pomeloes to Malaysia. Taiwan-grown pomeloes are popular in domestic and overseas markets for their tender and juicy taste, the Ministry of Agriculture’s Animal and Plant Health Inspection Agency said. The fruit is already exported to Japan, Canada, Hong Kong, Singapore and the Philippines, it added. The agency began applying for access to the Malaysian market in 2023, compiling data on climate suitability, pests and diseases, and post-harvest handling, while also engaging in nearly two years of negotiations with Malaysian authorities and submitting supplementary
PEAK MONTHS: Data showed that on average 25 to 27 typhoons formed in the Pacific and South China seas annually, with about four forming per month in July and October One of three tropical depressions in the Pacific strengthened into a typhoon yesterday afternoon, while two others are expected to become typhoons by today, Central Weather Administration (CWA) forecaster Lee Ming-hsiang (李名翔) said yesterday. The outer circulation of Tropical Depression No. 20, now Typhoon Mitag, has brought light rain to Hualien, Taitung and areas in the south, Lee said, adding that as of 2pm yesterday, Mitag was moving west-northwest at 16kph, but is not expected to directly affect Taiwan. It was possible that Tropical Depression No. 21 would become a typhoon as soon as last night, he said. It was moving in a
One of two tropical depressions that formed offshore this morning could turn into a moderate typhoon by the weekend, the Central Weather Administration (CWA) said today. Tropical Depression No. 21 formed at 8am about 1,850km off the southeast coast, CWA forecaster Lee Meng-hsuan (李孟軒) said. It is expected to move in a northwesterly direction as it continues building momentum, possibly intensifying into Typhoon Mitag this weekend, she added. The radius of the storm is expected to reach almost 200km, she said. It is expected to approach southeast of Taiwan on Monday and pass through the Bashi Channel between Tuesday and Wednesday,
About nine Taiwanese are “disappeared,” detained, or otherwise deprived of freedom of movement in China each month, the Mainland Affairs Council (MAC) said yesterday. Between Jan. 1 last year and Aug. 31 this year, 188 Taiwanese travelers went missing, were detained and interrogated, or had their personal freedom restricted, with some questioned in airports or hotel lobbies, the council said. In a statement ahead of the Mid-Autumn Festival, the council urged people visiting China for any reason to be highly vigilant and aware of the risks. Of the reported cases, 50 people were “disappeared” after entering China, 19 were detained and 119 had
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