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[学术文献 ] Acetamiprid in Rizhao green tea: Residue dynamics, degradation pathways, and ecological risks via integrated experimental and computational approaches 进入全文
Journal of Hazardous Materials 期刊
This study assesses the environmental persistence, processing effects, and toxicity mechanisms of acetamiprid in Rizhao green tea. Uniquely, we integrate season-resolved field trials, full-scale factory processing and atomistic DFT–docking analyses to deliver the first “field-to-cup” mass-balance for any neonicotinoid in tea. Field trials demonstrated concentration-dependent dissipation kinetics, with half-lives decreasing from 5.54 days (spring, RD) to 4.36 days (autumn, 3 ×RD). Seasonal variations, driven by higher autumn temperatures (18.2 °C vs. 12.5 °C) and light intensity (PAR: 1451 vs. 982 μmol/m²/s), significantly accelerated acetamiprid degradation. During tea processing, fixation reduced residues (PF<1), while drying caused significant accumulation (PF 2.63–2.99) due to high vapor pressure. GC-MS identified six degradation products, two of which—6-chloronicotinaldehyde and methyl 6-chloronicotinate—showed chronic toxicity to aquatic organisms (EC₅₀: 45.2–62.7 mg/L), though acute toxicity was absent. Density functional theory (DFT) revealed reactive sites in acetamiprid’s side chain, aligning with hydrolysis/oxidation pathways. Molecular docking and dynamics simulations elucidated acetamiprid’s neurotoxic mechanism: stable binding to nAChRs via hydrogen bonds with Trp-86 (−12.5 ± 0.8 kcal/mol contribution) and Lys-10, yielding a spontaneous binding energy of −5.5 kcal/mol. Seasonal harvesting adjustments (prolonged spring intervals) and optimized drying protocols are proposed to minimize residues. The study underscores the ecological risks of acetamiprid’s environmental persistence (soil half-life: 6.3–9.5 days) and transformation products, advocating for integrated agronomic practices to safeguard tea quality and aquatic ecosystems.
[专业会议 ] Inside the Tea Industry with Sharyn Johnston: Global Coffee and Tea Association Forum 2025 进入全文
World Tea News 网站
Thailand is emerging as a vibrant hub for specialty tea and coffee—uniting innovation, agro-tourism, and sustainability in a single breathtaking region. I had the exciting honor of speaking at the Global Coffee and Tea Association Forum 2025, held in the lush, tea-growing highlands of Chiang Rai, Thailand. With the theme “Shaping the Future Together,” this international gathering was a celebration of collaboration, community, and innovation across the global tea and coffee industries. Chiang Rai is one of those truly pristine places that instantly inspires. Surrounded by rolling green hills, high-altitude plantations, fresh mountain air, and a culture rich in craftsmanship, it’s no wonder Singha Park—Thailand’s leading agro-tourism destination—was a key host. Organized by Professor Piyaporn, Head of the Coffee and Tea Institute, and her team at Mae Fah Luang University, as well as Singha Park and the Thailand Convention and Exhibition Bureau, the forum brought together 211 delegates consisting of 165 Thai representatives and 46 overseas participants from 11 territories.
[行业报告 ] Brewing Trends - Analysis of Kenya's Tea Industry 进入全文
USDA 网站
茶叶在肯尼亚经济中占据举足轻重的地位：其出口额占全国总出口的16.3%，为第二大外汇来源。该产业直接和间接惠及逾700万人口的生计，2024年对国内生产总值（GDP）的贡献率约为1.2%。过去六年，肯尼亚年均生产244万吨绿茶原料，其中44.05万吨用于出口；经加工后，94%的成品茶继续外销，仅6%供国内消费。茶树全部种植于海拔1,500–2,300米（4,922–7,546英尺）的高原地带，得益于终年适宜的气候，茶叶可全年采摘。近年来，肯尼亚茶业经历显著转型，映射出消费行为与市场策略的双重变迁。最突出的动向在于增值茶与精品茶需求激增——面向城市消费者的调味拼配、花草 infusion 及单一庄园高端产品成为新宠。内罗毕、蒙巴萨等都市饮茶群体，受全球 wellness 思潮驱动，对品类多元与功能健康的诉求日益凸显。
[学术文献 ] ACLIVIA: a novel rapid testing kit for pesticide residue in green tea leaf 进入全文
Journal of the Science of Food and Agriculture 期刊
BACKGROUND：A study was undertaken to validate the performance of ACLIVIA, an AI-powered molecular recognition platform developed by Arogyam Medisoft Solution Pvt Ltd, in detecting residues of monocrotophos, acephate, acetamiprid, imidacloprid, dinotefuran and fipronil in freshly plucked tea leaves. These pesticides account for ca 90% of the total non-compliance of made tea in India. RESULTS：ACLIVIA requires 10 min for sample preparation and 2–4 min for analysis for identification of these pesticides. The validation was conducted through laboratory studies at TLabs, Tea Research Association, Kolkata, as well as field trials at tea estates managed by Luxmi Tea Company. A total of 332 samples, with pesticide residue levels ranging from 0 to 0.1 mg kg−1, were tested. ACLIVIA demonstrated high efficiency, achieving 94.12–100% sensitivity, 94.4–100% specificity, 95.52–96.92% accuracy and with a limit of detection at 0.005 mg kg−1. Additionally, the platform showed minimal interference from other pesticides. Field trials further confirmed that semi-skilled workers could be trained to operate the analyzer effectively within couple of days, making it suitable for use at factory level. CONCLUSION：These results highlight ACLIVIA's potential to revolutionize the tea industry by offering a fast, affordable (Rs150 or US$1.70 per sample testing cost) and reliable solution for detecting pesticide residues in green tea leaves.
[学术文献 ] Field Evaluation of Synthetic Components of the Sex Pheromone of the Tea Pest Helopeltis cinchonae Mann (Hemiptera: Miridae) 进入全文
Insects 期刊
Helopeltis cinchonae is an emerging pest of tea and causes severe damage to tea plantations in China. The female of H. cinchonae has been reported to produce a sex pheromone consisting of two components, hexyl (3R)-3-acetoxybutyrate and (5R)-1-acetoxy-5-butyroxyhexane, and lures containing the synthetic compounds have been shown to attract male H. cinchonae to traps in the field. This is the first time that components of the sex pheromone have been identified for a species of Helopeltis bug, but their field application has not been evaluated in detail. The present study shows that a blend of both compounds loaded into a polyethylene vial at 0.2 and 2 mg, respectively, caught significantly more male H. cinchonae bugs than the individual compounds and all the other tested blends. Sticky wing traps baited with the binary blend of compounds at the optimized ratio and dosage caught more bugs than bucket funnel or delta traps, and traps hung at a height of 10 cm above the tea shoots caught more bugs than those at other heights. The optimized traps and lures were used for monitoring the pest and two distinct population peaks of H. cinchonae were observed, the first one during mid-May to early June, and the other one in mid-September. Overall, the results of this study contribute to an environmentally-friendly approach to monitoring and managing H. cinchonae in the field.
[学术文献 ] Hyposidra talaca (Geometridae: Lepidoptera) outbreak in tea gardens: management strategies and future prospects 进入全文
Journal of Plant Diseases and Protection 期刊
This comprehensive review consolidates findings from various published articles, encompassing this pest’s ecology, morphology, diversity, their resistance patterns to plant allelochemicals and pesticides, and impact of climate change on the growth and development. The pest's habit and habitat, lifecycles, interactions with the environment, and defensive strategies are being studied thoroughly. This review also underscores the paradoxical issue of shade tree planting in tea plantations, which, while integral for quality tea-leaves, inadvertently fosters pest outbreaks. To address this, the planting of suitable shade trees like Melia azedarach, having insect repellent ability has been endorsed. Understanding these factors may result in low-cost maintenance, reduction in crop losses, and improved overall efficiency in pest management. This knowledge facilitates the development of proactive and sustainable pest management strategies, which effectively minimize the emergence, and proliferation of resistance, thereby safeguarding the long-term efficiency of pest management strategies.
