Dear Shrvan,

Please follow these links and pdf attachment for the said query.

https://www.researchgate.net/publication/232000364_Termite_Isoptera_control_in_agriculture_and_forestry_by_non-chemical_methods_a_review

http://pestkilled.com/termites-in-trees/

http://www.pestforce.com.au/termite-management-strategies/termites-in-trees

Best of Luck

Article Termite (Isoptera) control in agriculture and forestry by no...

You can apply some products of entomopathogenic nematodes

painting white lime at the bottom of the trunk of the trees is a good method which is conventionally followed for coconut trees. iam not sure of its efficacy on other trees

IGR Chitin Synthesis Inhibitor termite  Baits using Hexaflumuron, Noviflumuron, and Novaluron have proven effective at colony elimination when placed around infested trees.  Diflubenzuron has also been used effectively on Reticulitermes  but not Coptotermes.

CONTROL OF FORMOSAN SUBTERRANEAN TERMITE INFESTATIONS USING BAITS CONTAINING AN INSECT GROWTH REGULATOR

Nan-Yao Su, Edward Freytag, Edgar S. Bordes and Roman Dycus

https://ncptt.nps.gov/wp-content/uploads/2002-21.pdf 

http://entnemdept.ufl.edu/creatures/urban/termites/formosan_termite.htm 

Hello Dear

I think, entomopathogenic fungi such as Metarhizium anisopliae is a suitable candiate for micrbial control of termites. Best regards

 Research by Thomas Chouvenc  UF/IFAS/FLREC

Antifungal activity of the termite alkaloid norharmane against the mycelial growth of Metarhizium anisopliae and Aspergillus nomius

 Journal of Invertebrate Pathology 99(3):345-7 · August 2008

To control termite infection in trees use chloropyriphos organophosphorus pesticide or ,Carbamare pesticides like Primicarb & aldicarbob as the chemical control. In other method use Metarhizium anisopliae microbe as a eco-friendly biological control.