Abstract
The study aims to evaluate the bioactivity of plant essential oils (neem oil, garlic oil, marjoram oil, and menthol oil) on 2nd instar larvae of the cotton leafworm, Spodoptera littoralis in the laboratory. Also, LC50 of each treatment was established against 2nd instar larvae of S. littoralis under semi-field conditions. The obtained results reveal that neem oil was more effective than the other oils followed by, marjoram oil then garlic oil and then, menthol oil.LC50 was3022.50, 3803.41, 4630.13and5323.38ppm for neem oil, marjoram oil, garlic oil, and menthol oil, respectively, for 2nd instar larvae. While, when LC50of these oils applied on the 2nd instar larvae in the semi-field, the results indicated that, garlic oil was the most effective essential oil followed by, menthol oil, marjoram oil, and neem oil.
Highlights
Egyptian cotton leafworm, Spodoptera littoralis (Lepidoptera: Noctuidae) is one of the key pests that cause great damage to cotton plants as well as other fields and vegetable crops
The objective of this research was to assess the effect of some essential plant oils against 2nd instar larvae of cotton leafworm, Spodoptera littoralis
The Efficiency of The Essential Plant Oils On 2nd Instar Larvae of Cotton Leafworm, Spodoptera Littoralis Under Laboratory Conditions: The data in Table (1) indicated that neem oil caused a high mortality proportion on the 2nd instar larvae than the other essential oils
Summary
Spodoptera littoralis (Lepidoptera: Noctuidae) is one of the key pests that cause great damage to cotton plants as well as other fields and vegetable crops. On the one hand, one needs to search the new highly selective and biodegradable to solve the problem of long term toxicity to mammals and, on the other hand, one must study the environmental friendly pesticides and develop techniques that can be used to reduce pesticide use while maintaining crop yields. Terpenoids constitute the largest and most heterogeneous class of secondary metabolites and include monoterpenes and sesquiterpenes as volatile constituents (Dudareva et al, 2013). These volatile terpenoids can act both as constitutive and herbivory-induced (Herbivore-Induced Plant Volatiles, HIPVs) defense compounds
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