Endosulfan has been banned across 74 countries in all the continents after finding health and environment damages. You can replace chemical pesticides with biological products like entomopathogenic fungi, specifically the anamorphic taxa Beauveria bassiana and Metarhizium anisopliae, Hypocreales (Ascomycota), are among the natural enemies of pests in agroecosystems. Conservation biological control is a biological control strategy in which farming practices and environmental manipulations are adopted to enhance the living conditions for specific natural enemies of pests.
There is no organic/ natural alternative which can be used instead of endosulfan for pest control. However, certain less harmful alternatives are available, but they are costly and have other limitations. Pl refer that attached reports, how farmers are tackling this isuue in different countries.
Beauveria bassiana and Metarhizium anisopliae can be integrated with Neem products (water based solutions) since the oil-based formulations may have some adverse effects on the plant rooting system as well as on the entomopathogens
Biopesticides may provide a satisfactory alternative to chemical pesticides when used as part of an overall IPM module. I agree with Jacinter. Beauveria bassiana, Metarhizium anisopliae and Neem products can be integrated.
While I agree with all suggestions on biopesticides of botanical and microbial pesticides, I don't think that will answer Susan's concern, as they are no match to endosulfan. She must be looking for an alternative which is equally effective as endosulfan. I would suggest modern insecticides of agbicide/ neonicotinoid group like Imidacloprid will be the best alternative, I think.
I think It very difficult or not available alternative for Endosulfan. But we can use some new generation low toxic chemicals those are normally specific to species of insect.