Efficacy of Nano chitosan and mandarin crust oilon some biological aspects of Cotton Leafworm, Spodoptera littoralis (Boisd.)
Amal E Marouf
The effectiveness of mandarin crust oil, (Citrusreticulate) andNano Chitosan was evaluated under laboratory conditions against egg masses, 2nd instars larvae of cotton leaf worm, Spodoptera littoralis. The obtained results indicated that the effect of the oiland Nano Chitosan on S. littoralis eggs can be summarized as delayed embryonic development and ovicidal activity. According to the no hatchability % of the treated eggs, data showed that at the lowest concentration (10 ppm,1000ppm), (57%) of the Nano Chitosan, and mandarin crust oil caused a significant reduction in percent non hatchability compared with control (100 %). hatchability On the other hand, Nano Chitosan exhibited the highest toxic effect against egg stage followed by mandarin crust oil (Citrusreticulate) compared with control. However,the LC50 values were 11.5393, and 550.423 ppm, respectively. The treatments showed toxic and morphogenetic effects on S. littoralis 2nd instars larvae. Nano Chitosan was themost effective against 2nd instars larvae of S.littoralis followed by mandarin crust oil. The LC50 values were 6.537, and 2645.48 ppm, respectively. Also, the treatments were shown to cause some morphological changes in treated larvae. On the other hand, all treatments caused malformations in the emerged moths. So that, tested treatments can beapplied safely in IPM program for the cotton leafworm,Spodoptera littoralis control.
Amal E Marouf. Efficacy of Nano chitosan and mandarin crust oil on some biological aspects of Cotton Leafworm, Spodoptera littoralis (Boisd.). International Journal of Entomology Research, Volume 5, Issue 1, 2020, Pages 33-41