Egyptian Journal of Biological Pest Control· 2026Q1
Biological quality assessment of different generations of the parasitoid, telenomus busseolae Gahan (Hymenoptera: Scelionidae) reared on eggs of the sugarcane stem borer sesamia nonagrioides Lefèbvre (Lepidoptera: Noctuidae)
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- 2026year
Short summary
Laboratory rearing of the parasitoid wasp Telenomus busseolae over ten generations (F₀ to F₁₀) led to significant declines in biological quality, including a 37% reduction in female longevity and a drop in parasitism rate from 85.2% to 61.3%.
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Key points
- Telenomus busseolae showed significant declines in biological quality across ten laboratory-reared generations.
- Parasitism rate decreased from 85.2% (F₀) to 61.3% (F₁₀).
- Female longevity was reduced by approximately 37%, from 9.2 days to 5.8 days.
- Offspring sex ratio shifted from 75% female to 45% female (near 1:1).
- Emergence rate declined from 92.3% to 71.8%.
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Abstract
Background The present study evaluated the biological parameters (parasitism rate, fertility, emergence rate, adult longevity, and offspring sex ratio) of seven generations (F₀, F₁, F₃, F₅, F₇, F₈, and F₁₀) of the parasitoid wasp Telenomus busseolae Gahan (Hymenoptera: Scelionidae) reared on eggs of the sugarcane stem borer Sesamia nonagrioides Lefèbvre (Lepidoptera: Noctuidae) under laboratory conditions. Results A host colony was established from field-collected S. nonagrioides, and fresh eggs were provided to T. busseolae females from generations F₀ (field-collected), F₁, F₃, F₅, F₇, F₈, and F₁₀; 30 female wasps per generation were randomly selected for the parameter recording. Significant declines were observed across generations: parasitism rate decreased from 85.2% (F₀) to 61.3% (F10), fertility from 42.1 to 25.7 parasitized eggs/female, emergence rate from 92.3 to 71.8%, female longevity from 9.2 to 5.8 days, representing an a approximately 37% reduction. The offspring sex ratio shifted from 75% female (significantly female-biased) to 45% female, which did not differ significantly from a 1:1 ratio. Conclusions The results demonstrate a gradual decline in the biological quality of T. busseolae under laboratory rearing. Consequently, periodic introduction of field populations, optimization of rearing diets, and stringent environmental control are recommended to sustain the efficacy of T. busseolae in biological control programs.
The authors' abstract, as published at the source. Egyptian Journal of Biological Pest Control, 2026 · DOI ↗
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Field: Insect Science
Insect ScienceAgricultural and Biological Sciences