The Island of Jamaica has an abundance of wild and farmed papaya trees with leaves that can provide not only a healing tea but also a very powerful and natural insecticide to prevent the spread of mosquitos that propagate dengue fever, chikungunya virus and malaria. The research below, specific to Jamaica, was done in 2011 at Yerba Buena Farms.
This is another plant that grows quickly and easily. Because it is farmed commercially, it is very common. Jamaican cultural uses of the plant do not include using it as a pesticide. We will experiment with using the stain from the tree and the green fruit and the essential oil from the leaves.
Plant parts with insect controlling properties: leaves, seed, unripe fruit flower.
Target pests: thrips and fruit fly, mosaic virus and powdery mildew.
Preparation: 1 kg of finely shredded leaves, placed in 1 litre of water and squeezed through a cloth. Take 1 litre of soap solution, dilute it in 10-15 ml water.
Read more: The Properties of Papaya Leaf Insecticide | eHow.com http://www.ehow.com/list_6790220_properties-papaya-leaf-insecticide.html#ixzz1G776HXk9
Specific research on the effect of papaya leaf on the mosquito that carries Chikungunya and Dengue is below:
Bioefficacy of larvicdial and pupicidal properties of Carica papaya (Caricaceae) leaf extract and bacterial insecticide, spinosad, against chikungunya vector, Aedes aegypti (Diptera: Culicidae).
Kovendan K, Murugan K, Naresh Kumar A, Vincent S, Hwang JS.
Parasitol Res. 2012 Feb;110(2):669-78. doi: 10.1007/s00436-011-2540-z. Epub 2011 Jul 13.
The results that the leaves extract of C. papaya and bacterial insecticide, Spinosad is promising as good larvicidal and pupicidal properties of against chikungunya vector, A. aegypti. This is an ideal eco-friendly approach for the control of chikungunya vector, A. aegypti as target species of vector control programs.