Contribution of leaf growth on the disappearance of fungicides used on tea under south Indian agroclimatic conditions

Karthika, C; Muraleedharan, N.

doi:10.1631/jzus.b0920026

Cited by 15 publications

(5 citation statements)

References 8 publications

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“…Standard fungicides and biological control agents provided satisfactory control of the disease under the field conditions without any residual effects on tea. In this result accordance with Premkumar and Baby [23] have published the latest recommendations on the control of blister blight and grey blight in tea and also Karthika and Muraleedharan [24] supported that, fungicides residues were lost during the shoot expansion time and the 10 th day, the level of residues on tea shoots are definitely lower than the limits of residue effect. Hence upon the climatic factor, i.e., due to such as mainly growth dilution, rainfall elution, thermal degradation and photodegradation.…”

Section: Resultssupporting

confidence: 86%

In vitro Studies on Branch Canker Pathogen (Macrophoma sp.) Infecting Tea

P¹,

Premkumar²,

B³

2015

J Plant Pathol Microbiol

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Section: Resultssupporting

confidence: 86%

In vitro Studies on Branch Canker Pathogen (Macrophoma sp.) Infecting Tea

P¹,

Premkumar²,

B³

2015

J Plant Pathol Microbiol

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“…Dissipation of fungicides due to growth dilution factor was also observed in studies conducted on tea. [19] Conclusion Dissipation of trifloxystrobin and tebuconazole from onion followed first-order rate kinetics. The half-life of both the substances was about six days.…”

Section: Dissipation Kinetics Of Trifloxystrobin and Tebuconazolementioning

confidence: 94%

Persistence and dissipation kinetics of trifloxystrobin and tebuconazole in onion and soil

Mohapatra

2014

Journal of Environmental Science and Health, Part B

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The persistence and dissipation kinetics of trifloxystrobin and tebuconazole on onion were studied after application of their combination formulation at a standard and double dose of 75 + 150 and 150 + 300 g a.i. ha(-1). The fungicides were extracted with acetone, cleaned-up using activated charcoal (trifloxystrobin) and neutral alumina (tebuconazole). Analysis was carried out by gas chromatograph (GC) and confirmed by gas chromatograph mass spectrometry (GC-MS). The recovery was above 80% and limit of quantification (LOQ) 0.05 mg kg(-1) for both fungicides. Initial residue deposits of trifloxystrobin were 0.68 and 1.01 mg kg(-1) and tebuconazole 0.673 and 1.95 mg kg(-1) from standard and double dose treatments, respectively. Dissipation of the fungicides followed first-order kinetics and the half life of degradation was 6-6.6 days. Matured onion bulb (and field soil) harvested after 30 days was free from fungicide residues. These findings suggest recommended safe pre-harvest interval (PHI) of 14 and 25 days for spring onion consumption after treatment of Nativo 75 WG at the standard and double doses, respectively. Matured onion bulbs at harvest were free from fungicide residues.

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“…Robert and Hutson [21] assert that both metabolites are rather unstable and are unlikely to be accumulated. In Chinese kale, it took 23 days for carbofuran residue to dissipate below MRL of 0.01 mg/kg, where evaporation, photodegradation, and growth dilution are anticipated as the main pathways [22]. Typically, Chinese kale can grow to maturity in 28-35 days inclusive of 14 days in nursery.…”

Section: Discussionmentioning

confidence: 99%

Uptake and Dissipation of Carbofuran and Its Metabolite in Chinese Kale and Brinjal Cultivated Under Humid Tropic Climate

Sim

Chung

Jonip

et al. 2019

Advances in Agriculture

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Carbofuran is an insecticide with a broad spectrum of activity and is relatively cheap. It is banned in many countries in the world; however, it remains widely used in Asia, Australia, and South America. Carbofuran is commonly used in vegetable farming in Malaysia and it is a legally registered pesticide. This study reports the uptake and dissipation of carbofuran and 3-ketocarbofuran in Chinese kale and brinjal under humid tropic field conditions. The residue profile in plants demonstrated an increase to a maximum, followed by a consistent reduction to a level below the limit of determination (<0.01 mg/kg) over the experimental period. The maximum residue concentration was attained on Day 3 for kale (1.16 mg/kg fresh weight) and Day 7 for brinjal (0.06 mg/kg fresh weight) after carbofuran application. In order to comply with the maximum residue level (MRL) of 0.01 mg/kg, the preharvest interval for kale and brinjal were suggested at 23 and 28 days, respectively. The preharvest interval indicates that carbofuran is not recommended for Chinese kale but it is acceptable for brinjal. The average half-life of carbofuran in soil is 1.24 days, shorter than the literature values reported based on temperate condition, indicating accelerated dissipation under tropical climate. The estimated half-life of carbofuran in leaves was shorter than that in fruits with kale leaves reported at 2.54 days whilst brinjal leaves and fruits recorded at 3.22 and 10.33 days, respectively.

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Contribution of leaf growth on the disappearance of fungicides used on tea under south Indian agroclimatic conditions

Cited by 15 publications

References 8 publications

In vitro Studies on Branch Canker Pathogen (Macrophoma sp.) Infecting Tea

In vitro Studies on Branch Canker Pathogen (Macrophoma sp.) Infecting Tea

Persistence and dissipation kinetics of trifloxystrobin and tebuconazole in onion and soil

Uptake and Dissipation of Carbofuran and Its Metabolite in Chinese Kale and Brinjal Cultivated Under Humid Tropic Climate

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