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UI Student Develops Lemongrass-based Insecticides Against Beans Weevils - Education - Nairaland

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UI Student Develops Lemongrass-based Insecticides Against Beans Weevils by LazyGold(m): 4:55pm On May 16
A biochemistry doctoral student at the University of Ibadan, Mojisola Karigidi, who is the founder of Moepelorse Bio Resources, has produced a bio-pesticide for preserving beans, pulses and grains.

Giving the background to her pet research product, Karigidi said “weevils that attack beans and maize in storage can destroy as much as 40 per cent of these crops, causing huge loss to farmers and traders.”Farmers and food crop traders who are mostly uneducated, she added, indiscriminately apply insecticides to these crops in storage to minimise or eliminate losses as much as possible.

That practice has serious health and environmental implications, so said the researcher while speaking with The Guardian. “So, as a biochemist working on medicinal plants, I decided to investigate and develop a plant-based bio-pesticide to get rid of insect pests that attack food crops in storage, particularly beans and maize weevils using lemongrass leaves.” She said lemongrass is used locally for the treatment of mild fever, malaria and is also used in green tea products because of its medicinal properties. It has a long record of extensive therapeutic applications in traditional medicine in many countries across the globe.

“Apart from its medicinal properties, some people believe that growing the plant around their home can prevent the invasion of snakes and other reptiles. This belief motivated my team members and I to investigate the insecticidal ability of the plant against weevils,” she explained.

Product formulation

The researchers obtained the distillate of lemongrass by a distillation process and treated weevil-infested beans with different concentrations of the distillate. Prior to this, they reared beans weevils to breed them in large quantities for use. “The result was interesting, as we recorded the death of adult weevils within a short while. I thought of strengthening this effect by combining other botanicals like orange distillate for example, to produce a cocktail effect. The bio-pesticide formulated from this yielded 100 per cent weevil mortality within one hour of exposure,” she disclosed.

In another experiment, the researcher infested clean bean seeds that were without eggs with weevils and allowed the females lay eggs on the seeds. Female weevils began to lay eggs within 12 to 24 hours. The seeds containing visible weevil eggs were divided into groups and treated with different concentrations of the formulated distillate and then incubated in the dark for eight hours at room temperature to monitor adult emergence.Compared to the control group that was untreated, the treated groups showed no emergence of larva or adult weevils and no reduction in the weight of treated seeds.

The biochemist said the formulated bio-pesticide led to the mortality of both weevils and eggs, adding that further studies were done to obtain the most effective dosage.

Dosage and method of application

Based on the bio-efficacy of the bio-pesticide formulation carried out by the Nigerian Stored Products Research Institute (NSPRI), Ibadan, Nigeria, 6 ml of the product can effectively control 100g of weevil infested maize within 30 minutes of exposure. They recorded 100 per cent mortality of maize weevils in 30 minutes. At a lower dosage of 3 ml per 100g maize, 100 per cent weevil mortality was achieved after 24 hours of exposure.

For beans weevil control, 30 ml will get rid of all weevils in 3kg of beans within 30 to 60 minutes of exposure.However, the findings showed that preservation rather than control is the better approach for the use of the bio-pesticide, as it requires smaller quantity of the product to prevent weevil infestation on clean seeds and grains than already infested ones.

“So, immediate spraying of sorted harvested beans or maize grains with little quantity of the product and allowing to air dry for five to 10 minutes before bagging will effectively prevent weevil attacks,” the scientist said.

Comparative advantages

Application of the bio-pesticide, both for control and preventive purposes against weevil attack, can preserve the treated food item for up to a year and six months without the need for re-application. Re-application is often needed in the case of the currently used synthetic pesticides to preserve for this length of time.

Another advantage, she mentioned, is the well published medicinal properties of the plant, including anti-inflammatory, anti-bacterial, anti-fungal and antioxidant properties, which are also beneficial to humans.

Toxicity

The scientist said there was no recorded health implication for the consumption of lemongrass-treated food items, although there may be individual allergy to the lemongrass smell of the product.

Mode of action

The insecticidal and ovicidal effects of the bio-pesticide occur through inhalation and contact. The terpenes and terpenoids, which are plant secondary metabolites present in the plant formulation, cause symptoms that suggest a neurotoxic mode of action on treated beans and maize weevils. On prevention of weevil infestation, the lemony smell of the product repels weevils, thereby preventing their attack and the possibility of laying eggs.

Product barrier and its commercialisation

The chief developer of the product said the present barrier to the commercialisation of the product, which has been patented under the Trademarks, Patents and Designs Registry of the Federal Ministry of Industry, Trade and Investment of the Federal Republic of Nigeria, is the cost price.

She estimated that selling price is relatively higher when produced at the small-scale level, but upon licensing to big manufacturers, production cost would be reduced when material extraction is done large-scale. That way she said, the product could be made available to farmers, traders and households at affordable and competitive rates, especially for organic products.

Mojisola Karigidi was a 2017 Aspen New Voices fellow and a 2016 fellow of the Mandela Washington fellowship programme. She was selected as a 2014 fellow of the African Women in Agricultural Research and Development (AWARD) and became an awardee of the Global Innovation through Science and Technology (GIST Tech-I) competition in 2015 based on the lemongrass pesticide. She holds a Master’s degree in Biochemistry from the University of Ibadan.

www.guardian.ng/features/agro-care/ui-student-develops-lemongrass-based-insecticides-against-beans-weevils/amp

49 Likes 5 Shares

Re: UI Student Develops Lemongrass-based Insecticides Against Beans Weevils by LazyGold(m): 4:57pm On May 16
Lalasticlala
Re: UI Student Develops Lemongrass-based Insecticides Against Beans Weevils by superlightning: 4:57pm On May 16
I love UI. yeah, i said it.

43 Likes 3 Shares

Re: UI Student Develops Lemongrass-based Insecticides Against Beans Weevils by cosymyman: 5:00pm On May 16
Ok
Re: UI Student Develops Lemongrass-based Insecticides Against Beans Weevils by Harrymig1(m): 5:00pm On May 16
Wow amazing. I hope she gets the necessary support she needs to take it to the next level.

30 Likes

Re: UI Student Develops Lemongrass-based Insecticides Against Beans Weevils by Olawalesmarter(m): 5:54pm On May 16
Great feat
Re: UI Student Develops Lemongrass-based Insecticides Against Beans Weevils by Amuocha: 7:41pm On May 16
Great

"The scientist said there was no recorded health implication for the consumption of lemongrass-treated food items, although there may be individual allergy to the lemongrass smell of the product."

Justwise abeg confirm undecided

1 Like

Re: UI Student Develops Lemongrass-based Insecticides Against Beans Weevils by Lordknowz: 7:42pm On May 16
Nice 1 Ma'am!

9 Likes 1 Share

Re: UI Student Develops Lemongrass-based Insecticides Against Beans Weevils by abumeinben(m): 7:43pm On May 16
Correct

Unilorin lecturer

UI student

Uniben kwani?

4 Likes

Re: UI Student Develops Lemongrass-based Insecticides Against Beans Weevils by Uyi168(m): 7:43pm On May 16
Where is the picture of lemongrass based insecticide

4 Likes

Re: UI Student Develops Lemongrass-based Insecticides Against Beans Weevils by OkaNaUbe(m): 7:43pm On May 16
Nice!
Re: UI Student Develops Lemongrass-based Insecticides Against Beans Weevils by noble71(m): 7:43pm On May 16
Harrymig1:
Wow amazing. I hope he gets the necessary support he needs to take it to the next level.
But you didn't read the epistle. Say the truth? grin

16 Likes

Re: UI Student Develops Lemongrass-based Insecticides Against Beans Weevils by olioxx(m): 7:43pm On May 16
Harrymig1:
Wow amazing. I hope he gets the necessary support he needs to take it to the next level.
You nor dey read?
Didnt you read she is a female?
I tire o

18 Likes

Re: UI Student Develops Lemongrass-based Insecticides Against Beans Weevils by Stanleyville(m): 7:43pm On May 16
Ok
Re: UI Student Develops Lemongrass-based Insecticides Against Beans Weevils by manuelbreez(m): 7:44pm On May 16
Doesn't stop Messi from winning the Ballon d'or!

1 Like

Re: UI Student Develops Lemongrass-based Insecticides Against Beans Weevils by asuustrike1: 7:44pm On May 16
CC:lalasticlala your are doing a great job. Would appreciate if this achievement gets to front page. Well-done Sir

9 Likes

Re: UI Student Develops Lemongrass-based Insecticides Against Beans Weevils by olioxx(m): 7:44pm On May 16
noble71:
But you didn't read the epistle. Say the truth? grin
. Dont mind him, becus of FTC.

4 Likes

Re: UI Student Develops Lemongrass-based Insecticides Against Beans Weevils by princeSammyz: 7:46pm On May 16
Real researches do not die on the shelves, they find their ways into our daily lives... Kudos to her.
Re: UI Student Develops Lemongrass-based Insecticides Against Beans Weevils by Deathisfree: 7:46pm On May 16
Na who Dey chop beans ?

1 Like

Re: UI Student Develops Lemongrass-based Insecticides Against Beans Weevils by Mariangeles: 7:46pm On May 16
Wow! What a breakthrough !
Now, this is the kind of news worth reading, not the ones about suicide .

If they develop this, it'll make Nigerian beans more exportable .

6 Likes

Re: UI Student Develops Lemongrass-based Insecticides Against Beans Weevils by ayanbaba2(m): 7:49pm On May 16
correct! nice feat! ...of the greatest metabolite!
Re: UI Student Develops Lemongrass-based Insecticides Against Beans Weevils by ayanbaba2(m): 7:49pm On May 16
correct! nice feat! ...of the greatest metabolite!
Re: UI Student Develops Lemongrass-based Insecticides Against Beans Weevils by Emekus042: 7:50pm On May 16
LazyGold:
A biochemistry doctoral student at the University of Ibadan, Mojisola Karigidi, who is the founder of Moepelorse Bio Resources, has produced a bio-pesticide for preserving beans, pulses and grains.

Giving the background to her pet research product, Karigidi said “weevils that attack beans and maize in storage can destroy as much as 40 per cent of these crops, causing huge loss to farmers and traders.”Farmers and food crop traders who are mostly uneducated, she added, indiscriminately apply insecticides to these crops in storage to minimise or eliminate losses as much as possible.

That practice has serious health and environmental implications, so said the researcher while speaking with The Guardian. “So, as a biochemist working on medicinal plants, I decided to investigate and develop a plant-based bio-pesticide to get rid of insect pests that attack food crops in storage, particularly beans and maize weevils using lemongrass leaves.” She said lemongrass is used locally for the treatment of mild fever, malaria and is also used in green tea products because of its medicinal properties. It has a long record of extensive therapeutic applications in traditional medicine in many countries across the globe.

“Apart from its medicinal properties, some people believe that growing the plant around their home can prevent the invasion of snakes and other reptiles. This belief motivated my team members and I to investigate the insecticidal ability of the plant against weevils,” she explained.

Product formulation

The researchers obtained the distillate of lemongrass by a distillation process and treated weevil-infested beans with different concentrations of the distillate. Prior to this, they reared beans weevils to breed them in large quantities for use. “The result was interesting, as we recorded the death of adult weevils within a short while. I thought of strengthening this effect by combining other botanicals like orange distillate for example, to produce a cocktail effect. The bio-pesticide formulated from this yielded 100 per cent weevil mortality within one hour of exposure,” she disclosed.

In another experiment, the researcher infested clean bean seeds that were without eggs with weevils and allowed the females lay eggs on the seeds. Female weevils began to lay eggs within 12 to 24 hours. The seeds containing visible weevil eggs were divided into groups and treated with different concentrations of the formulated distillate and then incubated in the dark for eight hours at room temperature to monitor adult emergence.Compared to the control group that was untreated, the treated groups showed no emergence of larva or adult weevils and no reduction in the weight of treated seeds.

The biochemist said the formulated bio-pesticide led to the mortality of both weevils and eggs, adding that further studies were done to obtain the most effective dosage.

Dosage and method of application

Based on the bio-efficacy of the bio-pesticide formulation carried out by the Nigerian Stored Products Research Institute (NSPRI), Ibadan, Nigeria, 6 ml of the product can effectively control 100g of weevil infested maize within 30 minutes of exposure. They recorded 100 per cent mortality of maize weevils in 30 minutes. At a lower dosage of 3 ml per 100g maize, 100 per cent weevil mortality was achieved after 24 hours of exposure.

For beans weevil control, 30 ml will get rid of all weevils in 3kg of beans within 30 to 60 minutes of exposure.However, the findings showed that preservation rather than control is the better approach for the use of the bio-pesticide, as it requires smaller quantity of the product to prevent weevil infestation on clean seeds and grains than already infested ones.

“So, immediate spraying of sorted harvested beans or maize grains with little quantity of the product and allowing to air dry for five to 10 minutes before bagging will effectively prevent weevil attacks,” the scientist said.

Comparative advantages

Application of the bio-pesticide, both for control and preventive purposes against weevil attack, can preserve the treated food item for up to a year and six months without the need for re-application. Re-application is often needed in the case of the currently used synthetic pesticides to preserve for this length of time.

Another advantage, she mentioned, is the well published medicinal properties of the plant, including anti-inflammatory, anti-bacterial, anti-fungal and antioxidant properties, which are also beneficial to humans.

Toxicity

The scientist said there was no recorded health implication for the consumption of lemongrass-treated food items, although there may be individual allergy to the lemongrass smell of the product.

Mode of action

The insecticidal and ovicidal effects of the bio-pesticide occur through inhalation and contact. The terpenes and terpenoids, which are plant secondary metabolites present in the plant formulation, cause symptoms that suggest a neurotoxic mode of action on treated beans and maize weevils. On prevention of weevil infestation, the lemony smell of the product repels weevils, thereby preventing their attack and the possibility of laying eggs.

Product barrier and its commercialisation

The chief developer of the product said the present barrier to the commercialisation of the product, which has been patented under the Trademarks, Patents and Designs Registry of the Federal Ministry of Industry, Trade and Investment of the Federal Republic of Nigeria, is the cost price.

She estimated that selling price is relatively higher when produced at the small-scale level, but upon licensing to big manufacturers, production cost would be reduced when material extraction is done large-scale. That way she said, the product could be made available to farmers, traders and households at affordable and competitive rates, especially for organic products.

Mojisola Karigidi was a 2017 Aspen New Voices fellow and a 2016 fellow of the Mandela Washington fellowship programme. She was selected as a 2014 fellow of the African Women in Agricultural Research and Development (AWARD) and became an awardee of the Global Innovation through Science and Technology (GIST Tech-I) competition in 2015 based on the lemongrass pesticide. She holds a Master’s degree in Biochemistry from the University of Ibadan.

www.guardian.ng/features/agro-care/ui-student-develops-lemongrass-based-insecticides-against-beans-weevils/amp
Great work

1 Like

Re: UI Student Develops Lemongrass-based Insecticides Against Beans Weevils by ayanbaba2(m): 7:51pm On May 16
correct!

nice feat!


...of the greatest metabolite!

1 Like

Re: UI Student Develops Lemongrass-based Insecticides Against Beans Weevils by kaen1317: 7:51pm On May 16
This is Emeka's invention. That guy that graduated from UNN

1 Like

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