Spodoptera littoralis (Boisduval) is a very destructive pest of a widely huge number of plants all over the world. It caused huge damage to several crops. Pesticides have dangerous effect on human health. Plant extracts and oil have been shown to act as potent acute or chronic insecticides and insect growth regulators.  Different concentrations of onion extract, pepper extract and its essential oils were used against 2^nd instar larvae beside Agron 10% under laboratory conditions. the treated larvae with onion, pepper extracts showed shrinkage in larvae size where onion oil, pepper oil caused obvious swelling. Onion extract showed the highest effect on 2^nd instar larvae, comparing with the other extracts with LC₅₀ =661.89 ppm and LC₉₀ =8728.39 ppm.; while all treated larvae with Agron 10% died during the experiment without transfer to third instar and without any malformation.
 
Spodoptera littoralis (Boisduval) is a very destructive pest of a widely huge number of plants all over the world. It caused huge damage to several crops. Pesticides have dangerous effect on human health. Plant extracts and oil have been shown to act as potent acute or chronic insecticides and insect growth regulators.  Different concentrations of onion extract, pepper extract and its essential oils were used against 2^nd instar larvae beside Agron 10% under laboratory conditions. the treated larvae with onion, pepper extracts showed shrinkage in larvae size where onion oil, pepper oil caused obvious swelling. Onion extract showed the highest effect on 2^nd instar larvae, comparing with the other extracts with LC₅₀ =661.89 ppm and LC₉₀ =8728.39 ppm.; while all treated larvae with Agron 10% died during the experiment without transfer to third instar and without any malformation.