TY  - JOUR
T1  - Efficacy of Bacillus thuringiensis and Beauveria bassiana in Controlling Helicoverpa armigera
A1  - Lawrence N. Malinga
A1  - Mark D. Laing
JF  - Entomology and Applied Science Letters
JO  - Entomol Appl Sci Lett
SN  - 2349-2864
Y1  - 2024
VL  - 11
IS  - 4
DO  - 10.51847/HiDiennNyk
SP  - 16
EP  - 23
N2  - Helicoverpa armigera (Lep.: Noctuidae) is one of the most important pests of crops, which imposes huge management costs on farmers every year, and also causes environmental harm to the agricultural ecosystem because of the utilization of different chemical pesticides. In this study, the effectiveness of three various formulations of the insect pathogenic fungus Beauveria bassiana and a biological insecticide based on the active ingredient Bacillus thuringiensis subsp. kurstaki and organic insecticide-based plants were investigated in laboratory conditions and two tomato fields. The results of laboratory bioassay of various formulations of B. bassiana fungus with a 1 × 107 conidia/ml concentration on third-instar larvae revealed that all three various formulations of the pathogenic fungus caused between 84-91% mortality on third-instar larvae. The results of different concentrations of biological compounds on third-instar Helicoverpa armigera larvae after eight days revealed that with increasing concentration of use, the mortality rate also increases significantly. The highest mortality rate was reported with 93.33% at a 1.5 ml/L concentration and the lowest mortality rate was reported with 48.89% at a 0.5 ml/L concentration. The findings of the studies in tomato fields revealed that the effectiveness of the treatments used enhances with time and the highest percentage of effectiveness in all experimental treatments was between about 50 and 60% on the seventh and tenth days after foliar spraying. In the tomato field, the percentage of efficacy of fungal formulations decreased on the tenth day of foliar spraying. Regarding the fruit perforation percentage in both studied fields, the fungal treatment and the control treatment containing distilled water were placed in the same experimental group and revealed the highest rate of fruit perforation.
UR  - https://easletters.com/article/efficacy-of-bacillus-thuringiensis-and-beauveria-bassiana-in-controlling-helicoverpa-armigera-rfbzcfwcjeiumj8
ER  -