Document Type : Original Article
Authors
1
Cotton leafworm Department, Plant Protection Research Institute, Agricultural Research Center, Dokki, Giza, Egypt
2
Sids Agric. Res. Station, Beni Suef, Plant Protection Research Institute, ARC, Giza, Egypt
10.21608/ejm.2025.374993.1283
Abstract
By consuming young leaves, undermining growth, and ultimately reducing agricultural output, the cotton leafworm, Spodoptera littoralis, poses a major threat to over 90 plant species. Eco-friendly techniques to lessen harm to non-target organisms are given priority in integrated pest management systems. Among these, biological management techniques, such as the application of plant extracts and nanoparticles, have demonstrated significant effectiveness in managing the cotton leafworm.
This study assessed how neem seed oil, spirulina, curcumin, and nano-graphene oxide affected the biological traits of Spodoptera littoralis. Larvae in their fourth instar were given fresh castor leaves that had been individually treated with each of the four compounds.
Using the fourth instars, the calculated LC50 values for Neem seed oil, Spirulina, Curcumin and Nano-Graphene Oxide were84.77, 54.3, 102.2 and 47.717 ppm respectively, using the fourth instars. All treatments influenced larval and pupal durations, extending them by 24 % and 41% with neem seed extract, 23 and 87 % by Spirulina, by 7% and 54% with Curcumin and by 27 and 31 % with Nano-Graphene Oxide. Adult longevity also affected negatively by 29, 85, 41 and 35 % with Neem seed oil, Spirulina, Curcumin and Nano-Graphene Oxide, respectively. Digestive enzymatic activities in the insects were significantly affected following treatment with the LC-values of all treatments.
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