National Academy of Agricultural Sciences (NAAS)
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PRINT ISSN : 2319-7692
Online ISSN : 2319-7706 Issues : 12 per year Publisher : Excellent Publishers Email : editorijcmas@gmail.com / submit@ijcmas.com Editor-in-chief: Dr.M.Prakash Index Copernicus ICV 2018: 95.39 NAAS RATING 2020: 5.38 |
Shallot, Allium cepa var aggregatum L. (Alliaceae) is one of the major bulbous vegetable grown both as garden and field crop in India. The major leaf feeding insect pests of onion, Spodoptera exigua, Spodoptera litura, Helicoverpa armigera and the recently invasive insect Spodoptera frugiperda were causing destructive damage to the plant and made economic yield loss. Food consumption indices were studied under laboratory condition at room temperature 28 ± 20C and it is one of the parameter to identify the damage potential of insects. The growth rate (GR) and Efficiency of Conversion of ingested food (ECI) was significantly different in third instar but fourth and fifth instar, they showed less significant difference or on par with each other. The high GR and Consumption Index (CI) was observed in S. exigua (0.08 mg/day and 0.81 mg/day respectively), Efficiency of Conversion of Digested food (ECD) (12.76%) and ECI (12.23%) was the highest in S.litura in third instar but in fourth instar the highest ECD (13.49%) and ECI (10.34%) was observed in S.frugiperda and no significant difference was noticed in fifth instar for ECI and ECD. The grand mean GR and CI was the highest in S.exigua (0.06 mg/day), (6.82 mg/day) and the AD, ECD and ECI was the highest in H.armigera (93.68%), S.frugiperda (10.59%), S.litura (8.93%) respectively. The lowest Consumption Rate (CR) and CI were observed in S.litura (0.65 mg/day and 2.27 mg/day), and ECD and ECI were noticed in H.armigera (6.15% and (5.77%). The results of food consumption indices had indicated that S.exigua followed by H.armigera caused more damage on shallot onion than the other two caterpillars studied but effective utilization of food was made by S.litura and S.frugiperda.
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