BIO-INTENSIVE MANAGEMENT OF Helicoverpa armigera (Hubner) AND Maruca vitrata (Geyer) IN PIGEONPEA
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Date
2017
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Abstract
A field experiment entitled “Bio-intensive management of Helicoverpa
armigera (Hubner) and Maruca vitrata (Geyer) in Pigeonpea” was conducted at
Regional Agricultural Research Station, Lam, Guntur during Kharif, 2014-15. Twenty
pigeonpea genotypes were screened and morphological and biochemical factors like
trichome density, trichome length, phenol, protein and sugar content were studied and
the efficacy of certain bio-insecticides were evaluated against pod borers, H. armigera
and M. vitrata.
Among 20 genotypes screened against pod borers viz., H. armigera and M.
vitrata, five genotypes viz., LRG 30, LRG 41, ICPL 87119, ICP 8863 and BSMR 853
were found resistant with regard to per cent pod and grain damage. The results also
showed that none of the genotypes were free from pod borer damage. The genotype,
LRG 41 recorded highest pod and grain yield per plant i.e., 549.5 and 382.7 g,
respectively.
Among the morphological factors, trichome density on upper and lower surface
of leaf showed a significant negative correlation with pod damage due to pod borers.
Thus, the genotypes having higher density of trichomes on leaves suffered less pod
damage due to pod borers. Among the biochemical factors, sugars and proteins present
in flowers, pod walls and seeds showed significant positive correlation, whereas
phenols showed significant negative correlation with pod damage by pod borers.
Results on management of pod borers with bio-insecticides revealed that
spinosad 45 % SC @ 73 g a.i., ha-1 was highly effective in controlling the two
lepidopteron pod borers viz., H. armigera and M. vitrata by recording lowest per cent
pod and grain damage with highest yield (1671 kg ha-1) and incremental cost benefit
ratio (2.47).
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D5423
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