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Evaluation of Some Indigenous Plant Extracts Against Helopeltis

Dr. Mainuddin Ahmed
Chief Scientific Officer
Department of Pest Management, BTRI, Srimangal, Moulvibazar

Mohammad Shameem Al Mamun
Scientific Officer
Entomology Division,BTRI, Srimangal, Moulvibazar

Shovon Kumar paul
Scientific Officer
Entomology Division,BTRI, Srimangal, Moulvibazar

Abstract/ Executive Summary:

A laboratory experiment was conducted at Entomology laboratory to determine the toxic effect of some indigenous plant extracts against Helopeltis. Leaf and seed extracts of indigenous plants such as Neem, Mahogani, Datura, Kata mehedi, Bur weed and Lantana were prepared with acetone and water solvents and applied to Helopeltis by Topical application method. Data have been collected at 24HAT, 48HAT & 72HAT. Mortality percentages of Helopeltis were recorded. Mortality percentage was corrected by Abbot’s formula. Average mortality percentage of tea mosquito bug at 24, 48 and 72 hours after treatment indicated that Bur weed extract possessed the highest (52.86%) toxic effect, whereas Katamehedi leaf extract possessed the lowest (27.24%) toxic effect. Among the solvents, acetone extract was found more toxic (40.30%) and it was significantly different from water (37.01%) extract. The maximum average mortality (44.09%) was observed at the highest concentration (10.0%) of plant extract and the mortality percentage was directly proportional to the level of concentration of plant extract.

Keywords: Tea, Plant Extracts, Helopeltis

Location: BTRI Main Farm

Start Date: 01-01-2008

End Date: 31-12-2011

Program Area: Pest Management

Commodity: Plant(s)

Objectives:

To determine toxic effect of some indigenous plant extracts against Helopeltis

Methodology:

A laboratory experiment was conducted at Entomology laboratory to determine the toxic effect of some indigenous plant extracts against Helopeltis. Leaf and seed extracts of indigenous plants such as Neem, Mahogani, Datura, Kata mehedi, Bur weed and Lantana were prepared with acetone and water solvents and applied to Helopeltis by Topical application method. Data have been collected at 24HAT, 48HAT & 72HAT. Mortality percentages of Helopeltis were recorded. Mortality percentage was corrected by Abbot’s formula.

Source of Information: Annual Report 2011

Article Link (Online Journal):

Funding Source:

1.

Budget:

Total Budget (Tk.) :

Achievement/Findings:

It has been observed from the result that the botanicals used had direct toxic effect. Among the tested plants Bur weed extracts showed the highest toxic effect and acetone extract showed the maximum toxicity followed by water extracts. The order of toxicity of the plant extracts on tea mosquito bug, H. theivora were: Bur weed >Lantana> Datura> Neem> Mahogani> Katamehedi. The above mentioned plants are available throughout tea growing areas and the planters may use these plants in tea pest management especially for the control tea mosquito bug, H. theivora. The effectiveness of most of the plant extracts were found to increase proportionally with the increase of doses and decreases proportionally with increase of time.

Knowledge Management: Report/Proceedings