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Ovipositional Preference – A Cue for Screening Maize Germplasm for Resistance Against Chilo partellus (Swinhoe)

KrishiKosh

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Title Ovipositional Preference – A Cue for Screening Maize Germplasm for Resistance Against Chilo partellus (Swinhoe)
 
Creator DIVEKAR PRATAP ADINATH
 
Contributor Pradyumn Kumar
 
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Description T-8525
Maize is one of the most important cereal crops in the world as food, feed
and fodder. It has very high yield potential. There is no other cereal which has so
immense potentiality and that is why it is called ‘queen of cereals’. About 130 insect
pests cause varying degree of damage to maize crop in India. Among all the insect
pests of maize, stem borer Chilo partellus (Swinhoe) is the most serious pest found
throughout India. Yield losses due to this pest are up to 20-87 % (Rahman, 1944;
Singh et al; 1969; Mathur, 1983).
Ten different maize germplasm (inbreds) were evaluated for their
susceptibility to maize stalk borer, C. partellus (Swinhoe) on the basis of antixenosis
by oviposition preference of gravid females and antibiosis by artificial infestation
using neonate larvae. The parameters considered for ovipositional preference were
average plant height, average number of eggs per plant, average number of egg
masses per plant, serial number of leaves received eggs (leaf from the bottom to top of
the plant), percentage of plants received eggs and percentage of leaves received eggs.
The parameters considered for antibiosis are Leaf Injury Rating (LIR), recovery of
larvae and pupae, weight of larvae and pupae and percent pupation.
Among the ovipositional parameters, average number of eggs per plant is
found to be significantly correlated with the other ovipositional preference parameters
and non significantly correlated with the average number of eggs per egg mass. Other
ovipositional preference parameters like average plant height, average egg masses per
plant, average number of eggs per plant, percentage of plants received eggs,
percentage of leaves received eggs were found positively correlated with each other
and negatively correlated with the average number of eggs per egg mass. Almost all
the correlations were significant except the average number of eggs per egg mass. All
the antibiosis parameters such as LIR, larval weight, pupal weight, larval recovery
and pupal recovery were found highly correlated with each other but found poorly
correlated with the percent pupation. Ovipositional parameters were correlated with
antibiosis parameters and found that the average number of eggs per plant was
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positively correlated with parameters of antibiosis, but significant only with pupal
weight (r= 0.866**) and pupal recovery (r= 0.856**). In the case of average number
of egg mass/plant and antibiosis parameters, significant correlation was observed only
with larval recovery (r=0.652*), pupal weight (r=0.895**) and pupal recovery
(r=0.890**). Based on the results, Susceptibility Index (SI) was developed for
antixenosis (SIx), antibiosis (SIb) and also, the cumulative index for susceptibility
(SIs) by combining both the SI for the antixenosis (SIx) and antibiosis (SIb). Based on
cumulative susceptibility index, the test germplasm were categorized in three
susceptibility levels as less susceptible (3-8), moderately susceptible (8.1-13) and
highly susceptible (13-18). The inbred, HKI-1128 fall into highly susceptible and the
rest into less susceptible categories.
The purpose of this study was to find out the suitability of ovipositional
preference as a screening method to use in place of the widely used LIR method to
screen maize germplasm; hence the former is economical, need less time, space and
labour. But, the findings indicate that ovipositional preference can complement LIR
along with other parameters than replacing it. Thus the combined susceptibility index
(SIs) can be adopted for better screening of germplasm than the current approach of
relying only on LIR or only on antixenosis or antibiosis separately.
 
Date 2016-12-02T09:46:38Z
2016-12-02T09:46:38Z
2011
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/88797
 
Format application/pdf
 
Publisher IARI, DIVISION OF ENTOMOLOGY