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Tritrophic Interaction Between Pigeonpea Genotypes, Helicoverpa armigera (Hubner) and Natural Enemies

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Title Tritrophic Interaction Between Pigeonpea Genotypes, Helicoverpa armigera (Hubner) and Natural Enemies
 
Creator Shiddalingappa Hugar
 
Contributor K. Basavana Goud
 
Subject Agricultural Entamology
 
Description The present investigation on “Tritrophic interaction between pigeonpea genotypes,
Helicoverpa armigera (Hubner) and natural enemies” was carried out during 2008-12 at
ICRISAT (Patancheru, Hyderabad). Under no, dual and multi-choice conditions, egg laying
by H. armigera on ICPW 125 was minimum due to high density of type D trichomes, while
it was maximum on ICPL 87. The per cent Parasitisation by Trichogramma chilonis Ishii
was higher on ICPB 2042 and by Campoletis chlorideae Uchida it was greater on ICPL 87
and ICPL 87091 due to longer pods and clustering type of habitat and ICPL 87119 due to
higher pod wall thickness.
Odors from the flowers of ICPL 84060 and ICP 7035 attracted T. chilonis, and C.
chlorideae. C. chlorideae performed better on LRG 41, ICP 7035 and ICPL 84060. Larvae
failed to pupate in insects reared on leaves of ICPL 87 and ICPL 332 WR, due to lower
protein content and high amounts of carbohydrates and lipids, respectively. There was no
adult emergence from the larvae reared on leaves of ICPL 87119. Consumption index,
approximate digestibility and efficiency of conversion of ingested food into body matter of
the unparasitised larvae was greater than that of the parasitized larvae.
Odor stimuli from the hexane extract of flowers of ICPB 2042 attracted C.
chlorideae, while the methanol extract of flowers of ICPL 84060 attracted T. chilonis
females. Odor stimuli from the hexane extract of ICPB 2042 and ICPL 87119 pods attracted
the females of T. chilonis, while the methanol extract of pods of ICPL 87, ICPL 87119 and
ICPL 87091 attracted C. chlorideae females.
T. chilonis and C. chlorideae responded positively towards volatile compounds viz.,
(E)-Alpha faenesene, methylbenzoate (Z)-3-hexene-1-ol and linalool, while benzaldehyde
and acetaldehyde were not attractive to these parasitoids. b-caryophyllene attracted
T. chilonis but not the C. chlorideae.
 
Date 2016-07-25T14:16:34Z
2016-07-25T14:16:34Z
2012
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/69794
 
Format application/pdf
 
Publisher UAS Dharwad