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Science Investigatory Project Essay

Insect repellants are important tools for prevention of insect-borne disease as well as painful or uncomforatable insect bites.And on of natural insect repellant is the lemon grass(Cymbopogon Citratus).Determing the effectiveness of lemon grass as insect repellent is the main goal of the study.Specially,it intends to apply the Steam Distillation Technique in obtainingthe natural elements and essential oil of lemon grass such as citraland citronella.Using two candies as observation, one is with extract of lemon grass and other is without extract of lemon grass.In fourteen minutes,one candy that without lemon grass,approach by ants but the candy with lemon grass is just ignored by ants.The study has found out htat lemon grass is an effective and alternative natural insect repellent.The result of the present study would provide knowledge and information about lemon grass as insect repellent.Additionally,this study will produce significant and relevant information for future studies regarding to insect repellent.



The members of this group wish to extend their sincerest appreciation to the following people who helped make this project.They are the people who contributed much for the success of this endeavor.To God for his gift of wisdom and understanding to the members and answering their prayers in their time of need.To their Science teacher Mrs.Malazarte for teaching them the fundamentals of research and investigatory writing and for showing a great deal of patience throught times they tend to loss of hope and patience.To their parent’s and family members,for the unending love and support that they gave to the members.To the observers for their integrity and cooperation.And lastly to the people who contribute and helped this research especially to the members would like to extend their deepest thanks.



Insect repellents are important public health tools for the prevention of vector-borne infectious diseases.Actions to reduce vector-borne diseasescan result in major health gains and relieve an important constraint on development in poor regions.And this insect repellents help to prevent and control the outbreaks of insect-borne disease such as malaria,lyme disease,dengue fever,and bubonic plague(Wikipedia,2011).Technically,an insect repellent is any chemicalor natural,that causes insect or other arthropods to make directed,oriented movements away from the source of repellent.And lemon grass can use as natural insect repellent(Helmenstine,2011). According to an article of new tech bio,lemon grass is a very popularand used for medical,food and insect repellent products.the lemon grass oild are used in cosmetics,soaps,perfumes,dyes and odorizes along with thousands of other products.

In the Philippines,it has a local named known as “Tanglad”. Many repellent products pertaining chemical coumpound like DEET(N,N-Diethylmeta-toluamide)used as active chemical ingredient in insect repellent,are now turn to all natural ingredients as more and more negative data is released.Lemon grass is extremely safe and is listed on the EPA’s GRAS list(generally regarded as safe).People all over the world have come to relyon the potant insect repellent properties of lemon grass and utilize it as personal and area spray.


A.Our general objective:
The general objective of this study is to determine the effectiveness of lemon grass as natural insect repellent.

B.Specific Objectives:
1.To get the time(minutes)using stop watch to observe the time and duration of the effectiveness of lemon grass. 2.To observe the effectiveness of lemon grass using two candies,one candy is treated with lemon grass and other candy without lemon grass. C. STATEMENT OF PROBLEM

This study was conducted to answer the question/problem:
Will extract of lemon grass is an effectiveway of natural insect repellent?


If lemon grass will be extracted its natural components,and observe it applying the lemon grass over a subject that can easily approach by insect,then if it repel the insect away,it is to be an effective natural insect repellent.


The study will be conducted to determine the effectiveness of lemon grass as natural insect repellent.Extraction of lemon grass is through Steam Distillation Technique.The children will benefit the most because knowledge of insect repellent will enable them to prevent possible disease.Through this study, the knowledge of parents regarding lemon grass as insect repellent would be increases and prevention could be done to avoid more serious damage to their children’s health.


The focus of this study is to determine the effectiveness of lemon grass as insect repellent.Investigating the performance of these will be describe by observation of two candies.One candy will be treated lemon grass and another candy is without lemon grass.The study is performed during Christmas vacation.The data used in the research is gathered through observation and Steam Distillation Technique.

1.Stainless pot with an integral strainer
2.Curve pot cover
3.Stainless or steel glass receiving vessel
5.20pcs. of lemon grass

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