scholarly journals Establishment of a Faba Bean Banker Plant System with Predator Orius strigicollis for the Control of Thrips Dendrothrips minowai on Tea Plants under Laboratory Conditions

Insects ◽  
2021 ◽  
Vol 12 (5) ◽  
pp. 397
Author(s):  
Chang-Rong Zhang ◽  
Mei Liu ◽  
Fei-Xue Ban ◽  
Xiao-Li Shang ◽  
Shao-Lan Liu ◽  
...  
Keyword(s):  
Faba Bean ◽  
Southwest China ◽  
Aphis Fabae ◽  
Control Efficacy ◽  
Plant System ◽  
Polyphagous Predator ◽  
Banker Plant ◽  
Orius Strigicollis ◽  
Tea Plantations ◽  
Tea Plants

The stick tea thrip Dendrothrips minowai (Priesner) (Thysanoptera: Thripidae) is a destructive pest in tea plantations in south and southwest China. To control this pest, a non-crop banker plant system was developed using a polyphagous predator Orius strigicollis (Poppius) (Heteroptera: Anthocoridae) with the black bean aphid Aphis fabae (Scopoli) (Hemiptera: Aphididae) as an alternative prey and the faba bean Vicia faba as the banker plant to support the predator in targeting the pest. The fitness of A. fabae on tea plants and faba bean was evaluated to determine its host specificity. Moreover, the control efficacy of the banker plant system on D. minowai on tea plants was tested in the laboratory and compared with that of direct release of O. strigicollis. The experiments showed that faba bean was an excellent non-crop host for A. fabae because, while the aphid population increased quickly on faba bean, it could only survive for up to 9 days on tea plants. Compared with direct release of O. strigicollis, lower densities of pest were observed when introducing the banker plant system. Our results indicate that this banker plant system has the potential to be implemented in the field to improve the control of the pest thrips.

scholarly journals Use of banker plant system for sustainable management of the most important insect pest in rice fields in China

2017 ◽  
Vol 7 (1) ◽  
Author(s):  
Xusong Zheng ◽  
Yanhui Lu ◽  
Pingyang Zhu ◽  
Facheng Zhang ◽  
Junce Tian ◽  
...  
Keyword(s):  
Sustainable Management ◽  
Insect Pest ◽  
Rice Fields ◽  
Plant System ◽  
Banker Plant

Dissipation rates of some selected pesticides from the soil of tea agroecosystem in Assam, India

2016 ◽  
Author(s):  
Yumnam Devashree ◽  
B. K. Dutta ◽  
S. B. Paul ◽  
Sudip Choudhury
Keyword(s):  
High Performance ◽  
Negative Impact ◽  
Degradation Kinetics ◽  
Cost Benefit ◽  
Sampling Period ◽  
Application Rate ◽  
Tea Plantations ◽  
Tea Plants ◽  
One Year ◽  
The Impact

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.

scholarly journals Distribution, Severity, and Spread of Armillaria Root Disease in Kenya Tea Plantations

Plant Disease ◽  
1997 ◽  
Vol 81 (2) ◽  
pp. 133-137 ◽  
Author(s):  
J. M. Onsando ◽  
P. M. Wargo ◽  
S. W. Waudo
Keyword(s):  
Disease Severity ◽  
Management Practice ◽  
Woody Debris ◽  
Root Disease ◽  
Disease Spread ◽  
Tree Roots ◽  
Tea Plantations ◽  
Armillaria Root Disease ◽  
Residual Tree ◽  
Tea Plants

Surveys for Armillaria root disease severity were conducted over a 5-year period in small tea farms (0.5 to 1.0 ha) in the 12 tea-growing districts of Kenya. The disease occurred in all tea districts, but severity was greater in the districts east of the Rift Valley. Disease severity was associated with relative amounts of residual woody debris, especially roots, from trees and shrubs present when the land was converted to tea plantations. Excavation of tea bushes in disease centers showed that infection of tea bushes occurred primarily by mycelial growth from residual tree roots and from infected tea roots rather than from rhizomorphs. Rhizomorphs were scarce, and rarely involved in infection. They were confined mostly to the surface of the residual tree roots and were found growing freely in the soil in only one tea district. Rhizomorphs were more abundant in higher elevation plantations than in lower elevation plantations, where they occurred only on residual tree roots in the deeper, cooler, moister levels of the soil. Inoculum from residual tree debris in the soil was the most important source of infection in plantations of seed origin. Secondary spread from infected tea plants to healthy ones was limited and disease centers were small. In tea plantations derived from clonal cuttings, secondary disease spread from infected to healthy tea plants was more important resulting in large disease centers or gaps due to plant death and removal. Currently, soil sanitation by thorough removal of roots of forest trees and prompt removal of infected tea bushes is the best available management practice.

scholarly journals РЕАБИЛИТАЦИЯ НЕУХОЖЕННЫХ ЧАЙНЫХ ПЛАНТАЦИЙ И РАЗРАБОТКА ПОСЛЕДУЮЩЕЙ АГРОТЕХНОЛОГИИ НА ПРИМЕРЕ РЕГИОНА ИМЕРЕТИ

2019 ◽  
pp. 7-12
Author(s):  
Копалиани Р. Ш. ◽  
Джинчарадзе Н. И. ◽  
Капанадзе Ш. Ю.
Keyword(s):  
Root System ◽  
The State ◽  
Morphological Features ◽  
Extreme Conditions ◽  
Recent Past ◽  
Different Types ◽  
Tea Plantations ◽  
Long Time ◽  
Massive Scale ◽  
Tea Plants

Tea farming, in the recent past, was one of the leading branches of agriculture in Georgia. Since the 1990s of the last century this very important and leading branch of subtropical agriculture turned out to be bankrupt. On without well-groomed plantations, on a massive scale spread weeds, on the part of which, tea plants have undergone tough competition, it caused the weakness of tea culture function ability, in particular, in tea bushes were disturbed the function of physiological process, mainly the intensity of photosynthesis, increased breathing, etc. This article presents the results of a study of the state of tea plantations, who find themselves in extreme conditions unclean for a long time on the example of one of the tea producing regions of Georgia – Imereti, namely the degree of weed, morphological features of the aerial organs of tea plants, the root system, In this article it is discussed Some aspects of bushes caring process by applying different types of trimming and using the methods of mulching between rows. and also there is presented the development of practical measures for the rehabilitation of tea plantations.

scholarly journals The effects of tea plants-soybean intercropping on the secondary metabolites of tea plants by metabolomics analysis

2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Yu Duan ◽  
Xiaowen Shang ◽  
Guodong Liu ◽  
Zhongwei Zou ◽  
Xujun Zhu ◽  
...  
Keyword(s):  
Amino Acids ◽  
Secondary Metabolites ◽  
Growth Stages ◽  
Photosynthetic Parameters ◽  
Tea Quality ◽  
Tea Plantations ◽  
Sustainable System ◽  
Leguminous Crops ◽  
Tea Plants ◽  
Different Growth Stages

Abstract Background Intercropping, especially with legumes, as a productive and sustainable system, can promote plants growth and improves the soil quality than the sole crop, is an essential cultivation pattern in modern agricultural systems. However, the metabolic changes of secondary metabolites and the growth in tea plants during the processing of intercropping with soybean have not been fully analyzed. Results The secondary metabolomic of the tea plants were significant influence with intercropping soybean during the different growth stages. Especially in the profuse flowering stage of intercropping soybean, the biosynthesis of amino acids was significantly impacted, and the flavonoid biosynthesis, the flavone and flavonol biosynthesis also were changed. And the expression of metabolites associated with amino acids metabolism, particularly glutamate, glutamine, lysine and arginine were up-regulated, while the expression of the sucrose and D-Glucose-6P were down-regulated. Furthermore, the chlorophyll photosynthetic parameters and the photosynthetic activity of tea plants were higher in the tea plants-soybean intercropping system. Conclusions These results strengthen our understanding of the metabolic mechanisms in tea plant’s secondary metabolites under the tea plants-soybean intercropping system and demonstrate that the intercropping system of leguminous crops is greatly potential to improve tea quality. These may provide the basis for reducing the application of nitrogen fertilizer and improve the ecosystem in tea plantations.

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