Why arent mosquitoes found near neem trees?

Question

I read an article yesterday that wherever neem trees or spices are cultivated mosquitoes are not seen there. So why arent mosquitoes seen near these places (neem trees , spices, etc).What is it that prevents mosquitoes from living near these places?

Answer 1

Neem trees have the following active ingredients: aazadirachtin, nimbin, picrin, and sialin. Spices would contain similar compounds.