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STUDIES ON MANAGEMENT OF PINK BORER, Sesamia inferens Walker ON MAIZE

KrishiKosh

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Title STUDIES ON MANAGEMENT OF PINK BORER, Sesamia inferens Walker ON MAIZE
 
Creator PAVANI THATIKONDA
 
Contributor UMA MAHESWARI, T
 
Subject maize, animal developmental stages, planting, crops, insecticides, genotypes, biological interaction, biological phenomena, pesticides, germinability
Sesamia inferens
 
Description Experiments were conducted on “Studies on management of pink borer, Sesamia
inferens walker on maize” during rabi, 2010-11 under field and green house conditions at
College of Agriculture, Rajendranagar Hyderabad. Screening of maize genotypes against
pink borer were carried out at Maize Research Center, All India Co-ordinated Maize
Improvement Project (AICMIP), ARI, Rajendranagar, Hyderabad.
Twenty maize genotypes were evaluated for resistance to pink stem borer, S.
inferens under artificial infestation in the field during rabi season, 2010-2011. Data were
recorded on leaf injury on 1-9 scale. The maize genotypes viz., HQPM 1, DHM 117,
Winsynthetic, HKI 193-1, HKI 163-1, V 351, BML 6, HKI C 322, CM 202, 30 V 92,
BML 7, HKI MBR 139, CM 212 recorded a mean leaf injury rating (LIR) of 4.85, 5.08,
5.29, 6.21, 6.22, 6.49, 7.31, 7.31, 7.56, 7.87, 8.37, 8.50, 8.62, respectively. Among all
only HQPM 1 with lowest LIR of 4.85 was found to be moderately resistant and the
remaining genotypes were moderately susceptible to pink stem borer, S. inferens. The
genotypes, CM 144, CM 139, CM 137, CM 132 and DMRQPM 58 have recorded mean
LIR ranging from 8.87 to 9.00 above the susceptible check which were grouped as highly
susceptible.
The effect of larval densities of S. inferens during different stages of crop growth
of maize hybrid, DHM 117 under unprotected conditions indicated that with increase in
the larval density there was an increase in LIR. Leaf injury rating was significantly more
at two leaf stage (7 DAG) of the crop as compared to 14, 21, 28 day old plants. The
highest mean LIR was recorded when 20 larvae were released at 2 leaf stage (7 DAG)
and the lowest was at 8 leaf stage (28 DAG) when 5 larvae were released. The LIR
increased with increase in larval density irrespective of the crop age. Based on the
findings, maize crop at 2 leaf stage was considered as the most critical stage for S.
inferens irrespective of the larval densities.
Experiments conducted for evaluation of different management practices for S.
inferens with maize hybrid, DHM 117 under green house conditions made clear that
when different chemical insecticides viz., carbofuran, endosulfan, and bio pesticides viz.,
Beauveria bassiana and Bacillus thuringiensis were used against S. inferens and tested
for efficacy expressed in terms of mean leaf injury rating, percent dead hearts, stem
tunneling and number of exit holes per plant, percentage of live larvae recovered,
indicated that the insecticidal treatments were effective over the untreated control.
Among the treatments endosulfan was found to be more effective with 4.55 leaf injury
rating, 26.25 per cent dead hearts, 0.33 cm per metre stem tunneling, 0.45 number of exit
holes per plant, and 41.66 percentage of live larval recovery followed by carbofuran, B.
bassiana and B. thuringiensis
 
Date 2016-06-07T14:28:54Z
2016-06-07T14:28:54Z
2011
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/66958
 
Language en
 
Relation D8853;
 
Format application/pdf
 
Publisher ACHARYA N.G. RANGA AGRICULTURAL UNIVERSITY