Cockroaches live in a wide range of environments around the world, but they are most attracted to warm, moist environments. They are mainly nocturnal, spending the daylight hours in dark. They may also be found behind pictures or within electronic equipment. A number of these openings will ultimately lead to voids in the walls. The insects leave these sites at night to forage for food and water. The presence of cockroaches during the day may indicate a large population. Cockroaches are one of the oldest groups of insects, indicating how well they have been in adapting to changes in their environments. One reason for this may be related to their need of food; they are scavengers and will eat anything organic. Some species are even capable of remaining active for a month without food and are able to survive on limited resources. Since these insects also feed on human and pet food they can serve as instruments for disease transmission. To control these pests, chemical or synthetic insecticides are usually used by many households. These insecticides, however, allow risks of diseases mainly in a person’s respiratory system. This study seeks the possibility of finding an alternative cockroach killer in the form of an onion and calamansi extract. Calamansi and onion extract could be a potential cockroach killer due to the chemicals naturally present in them. The extract from onion revealed the presence of propanethial S-oxide and the juice from calamansi contains limonens which are believed to kill insects. D-limonine, the chemical found in calamansi, has the capability to melt the protective wax coating of an insect. On the other hand, propanethial S-oxide can suffocate and destroy the respiratory tract of an insect, which will eventually kill them. In making the insecticide, extract the calamansi juice by simply squeezing the fruit until it reaches the required amount. Slice the onion into smaller pieces then crush using a mortar and pestle. Mix all the...
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