▁highest ▁summ its ▁of ▁each ▁continent ▁in ▁the ▁world , ▁testing ▁his ▁physical ▁and ▁mental ▁end urance . ▁He ▁has ▁chosen ▁the ▁high - alt itude ▁mount aine ering ▁as ▁it ▁allows ▁a ▁human ▁being ▁to ▁put ▁his ▁physical ▁and ▁mental ▁health ▁under ▁inten se ▁pressure . ▁ ▁In ▁ 2 0 1 5 , ▁Sk at ov ▁was ▁awarded ▁a ▁“ H on or ary ▁Cit izen ” ▁of ▁Sl iven , ▁Bulg aria . ▁ ▁Scient ific ▁research ▁ ▁Dr . ▁Sk at ov ▁has ▁conducted ▁scientific ▁research es ▁in ▁areas ▁such ▁as : ▁▁ ▁Mor ph ology ; ▁bio ▁e col ogy ▁and ▁cont rolling ▁h ort icult ural ▁p ests ▁on ▁cro ps ▁( Tri ale uro des ▁v apor ari orum ▁west wood , ▁T et ran ych us ▁u rt ica e ▁k och , ▁Brad ys ia ▁dif form is ▁fre y , ▁My z us ▁pers ica e ▁sul zer , ▁A ph is ▁g oss yp i ▁glo ver , ▁etc . ); ▁ ▁In sect ic idal ▁effect ▁of ▁certain ▁plant ▁extract s , ▁such ▁as : ▁p ine ▁oil , ▁cast or ▁oil , ▁lav ender ▁oil , ▁quasi ▁( Qu ass ia ▁am ara ), ▁py re th rum , ▁az ad ira cht ine , ▁etc .; ▁ ▁Ben ef icial ▁insect s : ▁Enc ars ia ▁form osa ▁G ah an , ▁Mac ro lo ph us ▁pyg ma eus ▁R amb ur , ▁D ac n usa ▁sib