Efficacy of entomopathogenic fungi for control of walnut blue butterfly (Chaetoprocta odata [Hewitson, 1865]) in walnut (Juglans regia L.) under laboratory conditions | Učinkovitost entomopatogenih gliv za zatiranje gosenic orehovega modrina (Chaetoprocta odata [Hewitson 1865]) na orehu (Juglans regia L.) v laboratorijskih razmerah

English. Biological control nowadays is rapidly growing to reduce the incessant use of chemical insecticides for control of various insect pests. In the present study, entomopathogenic fungi are used to determine insecticidal activity against walnut blue butterfly under laboratory conditions. The experimental setup was completely randomized design (CRD) with two treatments along with control with different concentrations of entomopathogenic fungi. The bioassay was carried out by spraying second larval instar of Chaetoprocta odata [Hewitson 1865] with 1, 2, 3 & 4 % conidial concentration of Beauveria bassiana (Balsamo) Vuill. (1912) and Isaria fumosorosea Wize (1904). The results of this study showed that all the concentrations showed remarkable pathogenic activity but I.  fumosorosea was highly pathogenic and recorded the highest mortality rate of 93.33 % after 144 hours compared to B. bassiana where 73.33 % mortality was reported. LC50 values for B. bassiana (4.15) was higher than that of I. fumosorosea (3.34) which indicates that I.  fumosorosea was more effective against C. odata population. Among different concentrations of I. fumosorosea, 4 % concentration was the most effective with lowest LC50 values.

Slovenian. Biotično varstvo rastlin danes pridobiva na pomenu, kar vpliva na manjšo rabo kemičnih insekticidov pri zatiranju različnih vrst škodljivih žuželk. V pričujoči raziskavi sta bili uporabljeni dve vrsti entomopatogenih gliv za določitev njunega insekticidnega delovanja na orehovega modrina v laboratorijskih razmerah. Poskus je bil zasnovan kot popolni naključni poskus z dvema obravnavanjema in kontrolo. Poskus z glivama je bil izveden s škropljenjem druge razvojne stopnje gosenic modrina z 1, 2, 3 & 4 % koncentracijo konidijev gliv Beauveria bassiana (Bals.-Criv.) Vuill. (1912) in Isaria fumosorosea Wize (1904). Rezultati raziskave so pokazali, da so vse koncentracije konidijev imele opazno patogeno aktivnost, a je bila gliva I.  fumosorosea bolj patogena in je bila v obravnavanjih z njo dosežena največja smrtnost gosenic, 93,33 % po 144 urah, v primerjavi z glivo B. bassiana, kjer je bila smrtnost 73,33 %. LC50 vrednosti so bile za glivo B. bassiana  večje (4,15) kot pri glivi I. fumosorosea (3,34), kar kaže, da je bila gliva I. fumosorosea bolj učinkovita pri zatiranju gosenic orehovega modrina. Med različnimi koncentracijami konidijev glive I. fumosorosea je bila 4 % koncentracija najbolj učinkovita z najmanjšimi vrednostmi LC50.