Journal of Tea Science Pub Date : 2017-04-28 DOI: 10.5376/jtsr.2017.07.0004

B. Deka, A. Babu, M. Sarmah

{"title":"Bio-efficacy of Certain Indigenous Plant Extracts against Red Spider Mite, Oligonychus coffeae , Nietner (Tetranychidae: Acarina) Infesting Tea","authors":"B. Deka, A. Babu, M. Sarmah","doi":"10.5376/jtsr.2017.07.0004","DOIUrl":"https://doi.org/10.5376/jtsr.2017.07.0004","url":null,"abstract":"Leaf extracts of five different locally available plants such as Polygonum hydropiper L. , Vitex negundo L , Tithonia diversifolia (Hemsl.) (wild sun flower), Artemisia vulgaris L and Clerodendrum infortunatum L were evaluated for their ovicidal and acaricidal activity against the tea red spider mite, Oligonychus coffeae , Nietner (Tetranychidae: Acarina) in the laboratory using the leaf disc method under controlled conditions. Leaves collected from the above mentioned plants were dried under shade, milled in an electric blender and extracted using two different solvents, hexane and methanol and prepared different concentrations viz. 1%, 0.75%, 0.50% and 0.25% by diluting in DMSO (dimethyl sulfoxide; an important polar solvent) and were used for different bioassays. The effects of the extracts on the mortality of adults as well as in the eggs were assessed after spraying and the results were compared with an untreated control. All tested plants showed varying levels of efficacy on red spider mite compared when with the untreated control. Among five plant species tested, methanol extract of Vitex negundo and Clerodendrum infortunatum showed maximum ovicidal action (66.71% and 57.45% respectively) and exhibited more than 90% adult mortality @ 1% conc. of both the hexane and methanol extract of Vitex negundo and Clerodendrum infortunatum after 24 h.","PeriodicalId":17156,"journal":{"name":"Journal of Tea Science","volume":"49 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2017-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77942623","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 9

Effect of Tea on Gingivits: A Community-based Study 茶对牙龈的影响:一项社区研究

Journal of Tea Science Pub Date : 2017-04-20 DOI: 10.5376/jtsr.2017.07.0005

A. Laskar, C. Paul, B. Laskar

引用次数: 0

Effects of Micronutrients on the Nutritional Status of Clonal Tea Replanted in Areas Where Old Tea Was Uprooted 微量元素对老茶连根拔地再植无性系茶营养状况的影响

Journal of Tea Science Pub Date : 2017-03-20 DOI: 10.5376/jtsr.2017.07.0003

W. Omwoyo, Olunga Sween, S. Kibet, F. Oloo

{"title":"Effects of Micronutrients on the Nutritional Status of Clonal Tea Replanted in Areas Where Old Tea Was Uprooted","authors":"W. Omwoyo, Olunga Sween, S. Kibet, F. Oloo","doi":"10.5376/jtsr.2017.07.0003","DOIUrl":"https://doi.org/10.5376/jtsr.2017.07.0003","url":null,"abstract":"Tea yields peak is 21-30 years after which yields decline. The declining productivity and moribuncy has been reported in many tea fields due to prolonged period of monoculture under tea, physicochemical and biological properties of soil deteriorate considerably causing diseases, pests, acidic soils among others which leads to uprooting of old tea bushes. Deficiency of micronutrients in some tea sections has been reported which has been corrected by foliar application. Though the deficiency could be corrected through foliar application, this mode of application has its shortcomings including leaf burn and the mobility of nutrients from the leaves to the roots is very slow. This study aimed at determining the effect of soil application and variation of micronutrients on the nutritional status of clonal tea replanted in old tea lands.Leaf and soil samples were collected in a random complete block design and the micromutrient levels determined using Inductively Coupled Plasma Emission (ICPE). Data analysis was done using MSTAT-C software.The changes in the levels of micronutrients with varied eight micronutrient combinations subjected on different clones were studied. Clone 12/28 significantly (P≤0.05) varied with the other clones indicating that different clones have varied abilities to absorb nutrients. Clone 303/577 gave a significantly higher uptake of B in the order TRFK303/577 >S15/10 >12/28 >31/8. Clone 12/28 recorded a higher uptake of N with mean levels of 3.075, clone 31/8 had significantly higher uptakes of Fe and Zn. None of the micronutrients subjected on the clones brought an impact in the uptake of N and Mg. This study therefore recommends the use of soil application of micronutrients as an alternative to foliar application in areas where old tea bushes were uprooted.","PeriodicalId":17156,"journal":{"name":"Journal of Tea Science","volume":"69 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2017-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84135805","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Practical Utilization of Botanical Extracts and Microbial in Controlling Dieback Disease of Tea [ Camellia sinensis (L) O. Kuntze] Caused by Fusarium solani (Mart.) Sacc. 植物提取物和微生物在防治枯萎病中的应用Sacc。

Journal of Tea Science Pub Date : 2017-03-03 DOI: 10.5376/JTSR.2017.07.0002

S. R. Sarmah, P. K. Baruah, S. Das

{"title":"Practical Utilization of Botanical Extracts and Microbial in Controlling Dieback Disease of Tea [ Camellia sinensis (L) O. Kuntze] Caused by Fusarium solani (Mart.) Sacc.","authors":"S. R. Sarmah, P. K. Baruah, S. Das","doi":"10.5376/JTSR.2017.07.0002","DOIUrl":"https://doi.org/10.5376/JTSR.2017.07.0002","url":null,"abstract":"In Northeast Indian tea plantations infection of Fusaruim solani , resulting dieback of tea plant is increasing which causes considerable crop loss during the recent times. In this investigation, native plant extracts, i.e. Acorus calamus L., Azadirachta indica A. Juss., Clerodendrum viscosum Vent., and Xanthium strumarium L. and microbials i.e. Bacillus subtilis and Trichoderma viride Pers. were utilized to evaluate the efficacy in controlling dieback disease of tea. These extracts inhibited the growth of Fusarium solani by 60-90%. In field application of C. viscosum and X. strumarium extracts reduced the disease up to 89.3% and 81% respectively. More than 70% disease reduction was observed when aqueous extracts of A. calamus and A. indica were used separately. Maximum disease reduction was achieved up to 86.9% due to application of T. viride . The results, thus, suggested the potential use of herbal extracts and microbial strains as an effective component of integrated disease management (IDM) schedule in the organic tea farming. The methods and rate of application are also discussed.","PeriodicalId":17156,"journal":{"name":"Journal of Tea Science","volume":"53 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2017-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77122055","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Effects of Nitrogenous Fertilizer Rates, Plucking Intervals and Geographical Location of Production on Selected Micronutrient Levels of the Black Tea 氮肥用量、采采间隔和生产地理位置对红茶微量元素选择水平的影响

Journal of Tea Science Pub Date : 2017-02-06 DOI: 10.5376/JTSR.2017.07.0001

W. Omwoyo

引用次数: 0

Enhanced Acaricidal Activity of Senna auriculata and Ocimum tenuiflorum Extracts with the Addition of Adjuvant against Red Spider Mite, Oligonychus coffeae Nietner (Acarina: Tetranychidae) Infesting Tea 添加佐剂增强木耳番泻叶和花竹提取物对茶叶红蜘蛛螨、咖啡少爪螨的杀螨活性

Journal of Tea Science Pub Date : 2016-12-27 DOI: 10.5376/JTSR.2016.06.0010

Pandian Kumar, C. Sundaravadivelan, D. V. Kumar, A. Babu

{"title":"Enhanced Acaricidal Activity of Senna auriculata and Ocimum tenuiflorum Extracts with the Addition of Adjuvant against Red Spider Mite, Oligonychus coffeae Nietner (Acarina: Tetranychidae) Infesting Tea","authors":"Pandian Kumar, C. Sundaravadivelan, D. V. Kumar, A. Babu","doi":"10.5376/JTSR.2016.06.0010","DOIUrl":"https://doi.org/10.5376/JTSR.2016.06.0010","url":null,"abstract":"Tea ( Camellia sinensis ) is one of the most consumed non-alcoholic beverages in the world and has been affected by many pests which damage its quality and production globally. In this paper an attempt has been made to evaluate the aqueous leaf extracts of Senna auriculata and Ocimum tenuiflorum with and without adjuvant for their effect on red spider mite (RSM), Oligonychus coffeae (Nietner) infesting tea. Resulting, Senna auriculata, leaf extracts with adjuvant caused 90 % (LC 50 :1.21 and LC 90 :2.33 %) mortality which was greater compared to Ocimum tenuiflorum whereas 73 % (LC 50 :1.40 and LC 90 :2.81 %) was observed at 5 % concentration after 24 h exposure and very lowest mortality percent were observed both extracts without adjuvant. Ocimum tenuiflorum leaf extracts with adjuvant (0.05 %) showed highest ovicidal activity and effective ovipositional deterrence compared with S. auriculata treatment. The evaluated plant extracts with adjuvant are effective for controlling RSM and it could be an alternative, easily accessible, and eco-friendly approach for control of mite infesting tea.","PeriodicalId":17156,"journal":{"name":"Journal of Tea Science","volume":"14 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2016-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75501065","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Laboratory and Field Evaluation of an Entomopathogenic Fungus Formulation-Bioterminator (Metarhizium Anisopliae Metchnikoff) against Termite Infesting Tea 金龟子绿僵菌(Metarhizium Anisopliae Metchnikoff)拮抗茶叶白蚁的室内及现场评价

Journal of Tea Science Pub Date : 2016-12-22 DOI: 10.5376/JTSR.2016.06.0009

Hoque A.K.M.R., Aslam A.F.M., M. Ahmed, Mamun M.S.A., A. Howlader

引用次数: 6

Wage determination machinery of tea industry in India: a case of West Bengal State 印度茶业的工资决定机制:以西孟加拉邦为例

Journal of Tea Science Pub Date : 2016-10-24 DOI: 10.5376/jtsr.2016.06.0008

D. Biswas

引用次数: 1

The odor of matcha (Japanese powdered green tea) as the base note of green tea leaves 抹茶(日本粉末状绿茶)的气味，作为绿茶的基调

Journal of Tea Science Pub Date : 2016-04-15 DOI: 10.20425/IJTS.V0IOF.9577

Toshio Hasegawa, Yasutsugu Tsukumo, Takashi Fujita, T. Fujihara, A. Takahashi, K. Nakajima

{"title":"The odor of matcha (Japanese powdered green tea) as the base note of green tea leaves","authors":"Toshio Hasegawa, Yasutsugu Tsukumo, Takashi Fujita, T. Fujihara, A. Takahashi, K. Nakajima","doi":"10.20425/IJTS.V0IOF.9577","DOIUrl":"https://doi.org/10.20425/IJTS.V0IOF.9577","url":null,"abstract":"We previously reported the group of aroma constituents that characterize the odor of sencha (green tea made from leaves) which is similar to but distinct from the odor of commercially available matcha (Japanese green tea made from powder).This study, investigated whether the group of aroma compounds contributing to this matcha-like odor is present in all green tea cultivars and products. Crude sencha teas made from the 'Yabukita', 'Sayamakaori', 'Samidori', and 'Ujimidori' cultivars, and teas prepared by different processes (hojicha and unkacha), were investigated. These green tea leaves had a common matcha-like odor originating from a group of identical constituents. Commercially available matcha were studied as the source of the standard odor. The extracts obtained from matcha were separated into groups with different odors by fractional distillation. Chemical and analytical methods showed that the group of key compounds producing the matcha-like odor included a minute quantity of several aliphatic aldehydes. Many aldehyde proton signals were observed by 1H NMR and some aldehydes were detected by mass spectroscopy. It was concluded that a matcha-like odor that contained some aliphatic aldehydes was the base note of green tea leaves, indicating the importance of the matcha-like odor to green tea's odor character.","PeriodicalId":17156,"journal":{"name":"Journal of Tea Science","volume":"52 1","pages":"58-65"},"PeriodicalIF":0.0,"publicationDate":"2016-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81094746","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Dissipation rates of some selected pesticides from the soil of tea agroecosystem in Assam, India 印度阿萨姆邦茶叶农业生态系统土壤中某些农药的耗散率

Journal of Tea Science Pub Date : 2016-04-15 DOI: 10.20425/IJTS.V0IOF.9578

Yumnam Devashree, B. Dutta, S. Paul, Sudip Choudhury

{"title":"Dissipation rates of some selected pesticides from the soil of tea agroecosystem in Assam, India","authors":"Yumnam Devashree, B. Dutta, S. Paul, Sudip Choudhury","doi":"10.20425/IJTS.V0IOF.9578","DOIUrl":"https://doi.org/10.20425/IJTS.V0IOF.9578","url":null,"abstract":"An experiment was carried out in Rosekandy Tea Estate, Barak Valley, Assam to investigate the persistence of some selected pesticides (i.e Endosulfan, Fipronil, Paraquat and 2,4-D) on the soil. These pesticides were applied in the soil as per the application rate, where one year old tea plants were growing and the residue were analysed for a period of 50 days. Their degradation kinetics in soil was also studied and described. Soil samples were collected with the help of soil corer. The samples were brought to the laboratory, air dried in room temperature and extracted for analysis with high performance liquid chromatography (HPLC). Among the pesticides 2,4-D was highly persistent with half life of 57.75 days followed by Endosulfan which lost 42.64% of its initial concentration by the last sampling period (i.e 50 days) after the spraying. Fipronil and paraquat lost 65% and 70.32% of initial residue in soil making them the least persistent amongst these pesticides in the studied soil. Considering the impact of pesticide residues on human health, the less persistent pesticides may be used in tea plantations to minimize the potential negative impact of pesticides in the environment. The cost benefit ratios of the use of the pesticides should be also worked out.","PeriodicalId":17156,"journal":{"name":"Journal of Tea Science","volume":"10 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2016-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82540888","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

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