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MECHANISMS OF RESISTANCE IN SORGHUM TO EARHEAD BUG Calocoris angustatus Lethierry kHEMIPTERA - MIRIDAE)

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Title MECHANISMS OF RESISTANCE IN SORGHUM TO EARHEAD BUG Calocoris angustatus Lethierry kHEMIPTERA - MIRIDAE)
 
Creator PADMA KUMARI, A.P
 
Contributor Dasaradha Rami Reddy, D
 
Subject MECHANISMS, RESISTANCE, SORGHUM, EARHEAD, BUG
 
Description Experiments were undertaken to study the mechanisms
of resistance in an array of ten diverse sorghum genotypes
to the head bug, Calocoris angustatus Lethierry with major
emphasis on nonpreference of adults for oviposition
and/or feeding, and antibiosis e(fects on the survival and
development in the 1989/90 rainy·and postrainy seasons. Of
the ten genotypes, IS 14334, IS .17610, IS 19955, IS 20740,
IS 21444 and IS 23748 were nonpreferred by the adults in
both field and laboratory under .multi-choice conditions.
In double-choice tests, IS 14334 ,· I.S 19955, IS 207 40, IS
23748 and IS 17610 were nonprefe·rred compared with the
susceptible control, CSH 1. Under no-choice conditions,
the bug response was relat~vely less (26 to 33%
bugs/panicle) towards IS 19955, · IS 207 40, IS 21444, IS
23748 and IS 17610 as compared with the susceptible
controls, CSH 1, CSH 9 a~d ICSV 112 (53 to 56%
bugs/panicle). Population build-up was low when the bugs
were caged on IS 17610, IS 21444 ~t the half-anthesis and
milk stages in both the seasons and IS 20740 in the
postrainy season. Population· ·. build-up was lower in
panicles infested at milk stage than those infested at
half-anthesis stage. Results on oviposition were not
consistent over seasons. Less o.viposition was recorded in
IS 17610 during the postrainy season. Antibiosis effects
were noticed under field conditions in IS 23748, as more
number of nymphs failed to develop as adults. Nymphal
development was prolonged by one day when reared on IS
14334 and IS 16357 in the laboratory. Nonpreference for
feeding is a major component while nonpreference for
oviposition and antibiosis showed. a slight contribution
towards genotypic resistance to head bugs .
 
Date 2016-08-18T15:12:43Z
2016-08-18T15:12:43Z
1990
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/72917
 
Language en
 
Relation D3417;
 
Format application/pdf
 
Publisher ACHARYA N.G. RANGA AGRICULTURAL UNIVERSITY, RAJENDRANAGAR, HYDERABAD.