Influence of host plant nutrition on the incidence of Spodoptera litvra Helicoverpa armigera on groundnut
2003
Rao, K.R.(N.G. Ranga Agricultural University, Bapatla (India). Department of Entomology)
The influence of straight fertilizers and organic manures on the groundnut insect pests viz. Spodoptara litura Fab. and Helicoverpa armigera Hub. was, studied in the field from 1994 to 1996 in sandy loam soils of coastal Andhra Pradesh, India. These studies combined with other cultural practices tike planting sunflower as a trap crop to S. litura and spraying of nuclear polyhedrosis'virus (NPV). The pest population was counted on 10 plants at weekly intervals. Biochemical analysis of groundnut leaves was also done. During rabi seasons (December-April) the plot that received straight fertilizer and NPV spray reduced the S..litura. The organically manured treatments like farmyard manure, neem cake, vermicompost recorded lowest pest population compared to straight fertilized treatments. The groundnut plants that received organic manures recorded low nitrogen, higher levels of phenols and tannins whereas the straight fertilized groundnut leaves recorded the vice versa. The pest incidence was correlated with nitrogen content and negatively correlated with phenols and tannins. The organic manures induced the phenols and tannins production in groundnut plant and thus the induced resistance plays an important role in groundnut insect pest management.
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