Ayos Ng Mga Pangungusap

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The Feasibility of Tubang Bakod (Jatropha curcas) Seeds as Mosquito Repellant/Killer


Mosquito’s abound in tropical countries like the Philippines. They have been pestering land vertebrates for millions of years. Insecticides are either too harmful to both man and the environment or too expensive for the consumers. The purpose of this study is to create an environment-friendly, safe, effective and cheap mosquito repellant. Weeping willow leaves, tubang bakod seeds, tubang bakod seed hulls, onion peelings and almaciga sap were collected. The solid ones were pulverized and mixed together in three pans in 1:1:1:2:4 ratio. Two of the pans were given different amounts of the oil extracted from tubang bakod seed while the remaining one was given none. The mixtures were allowed to dry and were tested on mosquitoes for effectivity and on humans for acceptability. The results showed that tubang bakod has a significant repelling effect on mosquitoes.


Mosquitoes are one of the most unwanted, dreaded harmful insect pests known to man. They not only cause sleepless nights to humans because of their buzzes and bites but also cause serious, diseases. The mosquitoes may transmit pathogens that cause H-fever, filariasis and other less common but widespread infections among vertebrates. Commercially available mosquito repellants are big threats to human health. Others, such as the electric-powered ones, are too expensive for most Filipinos. Environment friendly, safe, effective but affordable mosquito using the tubang bakod seeds.


Mosquitoes transmit serious diseases that may sometimes lead to death. These diseases are more common in the tropics than anywhere else. But as long as the mosquitoes exist somewhere in the world, nobody is entirely safe from them.

The saliva of the mosquitoes may get infected with pathogens once they bite a carrier. These pathogens may be transmitted to the host through mosquito bites. Common viral infections caused by mosquitoes in their larval stages result from ingestion of contaminated food. Some studies revealed that commercial mosquito coils contain harmful ingredients such as allethrin, pynamin forte, prothrin and pyrethin I and other inert materials. These materials may cause intra-alveolar hemorrhages, congested blood vessels, atelectasis and compensatory emphysema of the lungs. Others were found to contain dredtin and DDT, both of which are poisonous and ozone depletor. One of the characteristics of the active ingredients used in mosquito coils is that it attacks the metabolism of the mosquito. They inhibit the production of cholinesterase, which leads to the death of the insect. A recent study has found a feasible insecticide from the oil extracted from the seeds of tubang bakod (Jatropha curcas) plant. The tubang bakod plant is a non seasonal plant found throughout the country. The seed contains a toxic substance, toxalbumin curcin and the oil glycerides of palmitic, oleic and linoleic acids. It also contains 29 — 40% of a yellow fixed oil known variously as Hell oil, Dinhoen oil, oleum infernale, or oleum ricini majeris. Weeping willow (Salix babylonica) leaves have also been found to contain essential oil that are much the same as the oil found in eucalyptus. Essential oil from eucalyptus and caryophyllum are know and used as effective insecticide and mosquito repellant, aside from their other medicinal properties. Onions (Allium cepa) were also observed to drive away insects that hover above them. Although their flesh is less combustible; it may be used as an additive to mosquito coil. It also contains traceable amount of essential oil.

Commonly used as incense by many Filipinos, almaciga (Agathis Philippinensis)sap is a sticky liquid that crystallizes when purified and cooled. It was found out that alrnaciga sap could be used as a smudge for mosquitoes.


Weeping willow leaves, onion peelings, tubang...
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