Growth of Spodoptera frugiperda on four host plants and its sensitivity to some insecticides using various exposure methods
Keywords:
Spodoptera frugiperda, host plants, insecticides, exposure methodsAbstract
In the maize fields, fall armyworm, Spodoptera frugiperda (FAW) Smith (Lepidoptera: Noctuidae) is a polyphagous lepidopteran pest, destroying maize crop, causes serious economic damage to corn plants worldwide in recent years especially Egypt. Three different insecticides were application with four exposure methods and four host plants in this research under laboratory conditions against S. frugiperda. Emamectin benzoate was the high efficacy insecticide (LC50 1.90 mg a. i. / L and Toxicity index 100 %). Therefore, emamectin benzoate was observed the average highest larvae mortality in the larva-dip, leaf-dip, film and spray methods of 83.57, 81.87, 81.25 and 77.27 %, respectively. While, the other insecticides were least toxic with average mortality percentage 75.62 and 48.75 % with, indoxacarb and pyradelil, respectively when the film method was used. The moderate activity of indoxacab and pyradelil spray and leaf-dip methods comparing to that larva-dip method. Also, limited research has been conducted on biological aspects of FAW reared on different plants. Our findings demonstrated that there were various in larvae development period reared on maize had the shortest development duration 16.75 days and pupa period 9.25 days, the fecundity (1650.50 egg) and fertility (95.23 %) were highest, while the larvae (20.00 days) and pupa (14.25 days) duration were the longer fed on cotton, the fecundity (1110.25 egg) and Fertility (66.87%) were least. There were also moderate in the development survival, fecundity and Fertility to FAW reared on cowpea and potato plants. The preferred host of FAW in vitro was maize and other host plants were intermediate host.
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