ISSN 2756-3839
International Journal of Nematology and Entomology ISSN 2756-3839 Vol. 12 (3), pp. 001-005, March, 2025. Available online at www.internationalscholarsjournals.org © International Scholars Journals
Full Length Research Paper
Efficacy of Beauveria bassiana Against Eurygaster integriceps: A Time-Dependent Analysis
Abdul Nasser Trissi1, Mustapha El Bouhssini2*, Mohammad Naif Al Salti1,
Mohammad Abdulhai4, Margaret Skinner3 and Bruce L. Parker3
1Aleppo University, Faculty of Agriculture, Aleppo, Syria.
2International Center for Agricultural Research in the Dry Areas, P. O. Box 5466, Aleppo, Syria.
3Entomology Research Laboratory, University of Vermont, Burlington, VT, USA. 05405-0105, USA.
4General Commission for Scientific Agricultural Research, Aleppo Center, Aleppo, Syria.
Accepted 7 January, 2025
The virulence of Beauveria bassiana to overwintering Sunn pest adults was determined in the laboratory using micro-application techniques. Five microliter of 2 × 103, 2 × 104, 2 × 105, 2 × 106, 1 × 107, 2 × 107, 1 × 108 conidia/ml-1 were used in November, January and March. Applications were made to the mesosternum of adults. Mortality was recorded every 2 days for 16 days. Isolates were efficacious to Sunn pest at the higher concentrations. The cumulative corrected mortality after 12 days varied from 2.3% (SPT22) at 2×103 conidia/ml-1, when treatment was conducted in November, to 100% (SPSR2) at 1×108 conidia/ml-1 in March. The LC50 for SPSR2 decreased from 1.1×107 to 3.7×103 conidia/ ml-1 when treatment was conducted in November and March, respectively. The 50% lethal time (LT50) varied from 17.07 days for GHA (the commercial fungal isolate – in BotaniGard), to 9.31 days for SPSR2 in November. The most efficacious isolate was SPSR2.
Key words: Sunn pest, Eurygaster integriceps, Beauveria bassiana, LC50, LT50.