Detail:

R Sundararaman soaks 5 kg erukku or giant milkweed (Calotropis gigantea) leaves in 10 L of cow urine and 5 L of water in a earthen pot and leaves it untouched for 3-5 days. After this period he filters the solution and dilutes in 80 L of water and then sprays on the foliage that is likely to be attacked by caterpillars.

Knowledge Provider / Innovator: R Sundararaman
Agro-Ecological Zone: North-Western Zone (TN-2), Western Zone (TN-3)
Address: ErodeTamil Nadu
District: Erode
State: Tamil Nadu
PIN Code 638401

Formulation: 5 kg of (Calotropis gigantea) leaves, 10 L of cow urine and 5 L of water
Ingredients: Leaves of erukku or giant milkweed (Calotropis gigantea), cow urine and water.

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PAS 1:

"Aqueous of Calotropisgigantea leaves were screened for larvicidal activity, mosquito repellent activity and ovicidal activity against Culexgelidus and C. tritaeniorhynchus mosquitoes. The extract doesn’t exhibit 100 % mortality against both the mosquito larvae. However, the extract showed dose dependent larvicidal activity with an motility rate of 86±1.42% (LC50=137.90) against C. gelidus and 94±1.31% (LC50=110.05) against C. tritaeniorhynchus. At 125, 250, 500 and 1000 ppm dose C. gigantea leaves extract exhibits complete protection from mosquito bite for 60, 90, 90 and 240 minutes against C. gelidus and 60, 90, 90 and 120 minutes respectively against (C. tritaeniorhynchus). (C. gigantea) showed moderate ovicidal at 1000 ppm concentration against both mosquitoes eggs. Phytochemical analysis of the extract exhibited the presence of phenolic compounds, flavonoids, alkaloids, tannins, saponins, glycosides and phytosterols as major phytochemical groups. These results suggest that the leaves of C. gigantea have the potential to be used as a natural source for the development of new, safe, potential and eco-friendly insecticide for the control of C. gelidus and C. tritaeniorhynchus mosquitoes. [Journal of Agricultural Technology 2012 Vol. 8(3): 869-880 Available online
http://www.ijat-aatsea.com ISSN 1686-9141, Larvicidal, repellent and ovicidal activity of Calotropisgigantea against Culexgelidus, Culextritaeniorhynchus (
Diptera: CulicidaeJournal of Agricultural Technology 2012 Vol. 8(3): 869-880 Available online
http://www.ijat-aatsea.com ISSN 1686-9141 ]"
http://www.ijat-aatsea.com/pdf/v8_n3_12_may/8_IJAT_2012_Kumar,_G-_Final_Proof-Entomology.pdf

PAS 2:

"Fresh leaf extract of milkweed (Calotropis procera) showed larvicidal properties against mosquito larvae of (Anopheles stephensi), (Culex quinquefasciatus) and (Aedes aegypti). Methanolic extracts of the same plant were, however, more effective as larvicide. (C. procera) is a weed growing in uncultivated soils as well as in dry, arid zones in Indian subcontinent throughout the year. The results of this study suggest the utility of milkweed as potential technology for control of mosquito larvae. [Singh RK, Mittal PK, Dhiman RC. Laboratory study on larvicidal properties of leaf extract of Calotropisprocera (Family-Asclepiadaceae) against mosquito larvae. J Commun Dis. 2005 Jun;37(2):109-13.
PMID: 16749273.]"
https://pubmed.ncbi.nlm.nih.gov/16749273/ 43.