Biological Control of Tea Pests

Hazarika, L. K.; Puzari, K. C.; Wahab, Seema

doi:10.1007/978-1-4615-1377-3_11

Cited by 23 publications

(11 citation statements)

References 9 publications

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“…As March to mid-November is the season for the tea planters to harvest the crop, the tea plants will be easily affected by pests as the population of the pests peaks from June to September (see Figure 1). Hence, pests become inevitable guests in every cropping system and reduce plant growth, damage different parts of the plant, reduce the quality of the crop, and ultimately affect the productivity of crop yields [6]. The insects suck the sap from buds, leaves and terminal twigs with the help of their mouth styles, as well as infusing them with their saliva, which is a toxic substance [6].…”

Section: Introductionmentioning

confidence: 99%

Dynamics of Fractional Model of Biological Pest Control in Tea Plants with Beddington–DeAngelis Functional Response

et al. 2021

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In this study, we depicted the spread of pests in tea plants and their control by biological enemies in the frame of a fractional-order model, and its dynamics are surveyed in terms of boundedness, uniqueness, and the existence of the solutions. To reduce the harm to the tea plant, a harvesting term is introduced into the equation that estimates the growth of tea leaves. We analyzed various points of equilibrium of the projected model and derived the conditions for the stability of these equilibrium points. The complex nature is examined by changing the values of various parameters and fractional derivatives. Numerical computations are conducted to strengthen the theoretical findings.

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Section: Introductionmentioning

confidence: 99%

Dynamics of Fractional Model of Biological Pest Control in Tea Plants with Beddington–DeAngelis Functional Response

et al. 2021

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“…Outbreak populations of this phytophagous pest can completely defoliate a tea bush, thereby causing severe reduction of tea production with considerable economic damage (Hazarika et al 2009;Zhang et al 2014). Heavy application of synthetic pesticides are still widely used to control this pest, which can result in undesirable residues on tea leaves and soil causing adverse health and environmental effects (Hazarika et al 2001;Ye et al 2014). The use of mating disruption strategies that employ area-wide application of sex pheromones to manage E. obliqua populations has become a promising alternative to pesticide applications (Hazarika et al 2009).…”

Section: Introductionmentioning

confidence: 99%

Response to Enantiomers of (Z3Z9)-6,7-Epoxy-Octadecadiene, Sex Pheromone Component of Ectropis obliqua Prout (Lepidoptera: Geometridae): Electroantennagram Test, Field Trapping, and in Silico Study

Feng

Yang

et al. 2019

Florida Entomologist

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“…Its larvae exclusively feed on tea leaves and tender buds, causing severe deterioration in yield and quality ( Ma et al, 2016 ). The therapeutic approach of killing this pest with chemicals has been the prevailing control strategy ( Hazarika, Puzari & Wahab, 2001 ; Ehi-Eromosele, Nwinyi & Ajani, 2013 ; Xin et al, 2016 ). However, indiscriminate use of chemicals in tea gardens has given rise to a large number of problems, including resurgence of primary pests ( Harmatha et al, 1987 ), resistance development ( Gurusubramanian et al, 2008 ), undesirable residues in tea products ( Feng et al, 2015 ) and environmental contamination ( Saha & Mukhopadhyay, 2013 ; Ye et al, 2014 ).…”

Section: Introductionmentioning

confidence: 99%

Tea saponin reduces the damage of Ectropis obliqua to tea crops, and exerts reduced effects on the spiders Ebrechtella tricuspidata and Evarcha albaria compared to chemical insecticides

Zeng

Zhao

et al. 2018

PeerJ

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BackgroundTea is one of the most economically important crops in China. However, the tea geometrid (Ectropis obliqua), a serious leaf-feeding pest, causes significant damage to tea crops and reduces tea yield and quality. Spiders are the most dominant predatory enemies in the tea plantation ecosystem, which makes them potentially useful biological control agents of E. obliqua. These highlight the need for alternative pest control measures. Our previous studies have shown that tea saponin (TS) exerts insecticidal activity against lepidopteran pests. Here, we investigate whether TS represents a potentially new alternative insecticide with no harm to spiders.MethodsWe investigated laboratory bioactivities and the field control properties of TS solution against E. obliqua. (i) A leaf-dip bioassay was used to evaluate the toxicity of TS to 3rd-instar E. obliqua larvae and effects of TS on the activities of enzymes glutathione-S-transferase (GST), acetylcholinesterase (AChE), carboxylesterase (CES) and peroxidase (POD) of 3rd-instar E. obliqua larvae in the laboratory. (ii) Topical application was used to measure the toxicity of 30% TS (w/v) and two chemical insecticides (10% bifenthrin EC and 50% diafenthiuron SC) to two species of spider, Ebrechtella tricuspidata and Evarcha albaria. (iii) Field trials were used to investigate the controlling efficacy of 30% TS against E. obliqua larvae and to classify the effect of TS to spiders in the tea plantation.ResultsThe toxicity of TS to 3rd-instar E. obliqua larvae occurred in a dose-dependent manner and the LC50 was 164.32 mg/mL. Activities of the detoxifying-related enzymes, GST and POD, increased in 3rd-instar E. obliqua larvae, whereas AChE and CES were inhibited with time by treatment with TS. Mortalities of E. tricuspidata and E. albaria after 48 h with 30% TS treatment (16.67% and 20%, respectively) were significantly lower than those with 10% bifenthrin EC (80% and 73.33%, respectively) and 50% diafenthiuron EC (43.33% and 36.67%, respectively). The highest controlling efficacy of 30% TS was 77.02% at 5 d after treatment, which showed no difference to 10% bifenthrin EC or 50% diafenthiuron SC. 30% TS was placed in the class N (harmless or slightly harmful) of IOBC (International Organization of Biological Control) categories for natural enemies, namely spiders.ConclusionsOur results indicate that TS is a botanical insecticide that has a good controlling efficacy in E. obliqua larvae, which suggests it has promise as application in the integrated pest management (IPM) envisaged for tea crops.

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Biological Control of Tea Pests

Cited by 23 publications

References 9 publications

Dynamics of Fractional Model of Biological Pest Control in Tea Plants with Beddington–DeAngelis Functional Response

Dynamics of Fractional Model of Biological Pest Control in Tea Plants with Beddington–DeAngelis Functional Response

Response to Enantiomers of (Z3Z9)-6,7-Epoxy-Octadecadiene, Sex Pheromone Component of Ectropis obliqua Prout (Lepidoptera: Geometridae): Electroantennagram Test, Field Trapping, and in Silico Study

Tea saponin reduces the damage of Ectropis obliqua to tea crops, and exerts reduced effects on the spiders Ebrechtella tricuspidata and Evarcha albaria compared to chemical insecticides

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