CROP LOSS ESTIMATION AND MANAGEMENT OF SHOOT BUG, Peregrinus maidis (Ashmead) IN RABI SORGHUM
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Date
2007-01-20
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University of Agricultural Sciences GKVK, Banglore
Abstract
The investigations were undertaken at the AlCRP on sorghum, RARS, Bijapur during
rabi 2004-05 on loss estimation, varietal reaction and management of shoot bug.
Natural infestation of shoot bug resulted in the yield loss of 11.16, 21.11 and 2.97% in
grain yield, fodder yield and 1000-grain weight across the different dates of sowing. The
unprotected plot recorded significantly higher sorghum stripe disease incidence as compared
to protected ones (18.72% and 9.51%). Under graded level of infestation, the yield reduction
ranged from 7,1 to 51.3% and 9.1 to 49.7% in grain and fodder yield with release of 5 to
30 first instar nymps per plant, respectively. The economic injury level of shoot bug was
worked out to be 3.13 bugs per plant. Among the 80 genotypes screened against shoot bug
the lines viz., 61611, 61612, CK 608, Swati, and RS 29 were promising by recording lower
population (<2 shoot bugs/plant). Other entries recorded shoot bug population between 2 to
10 p
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