STUDIES ON HOST PLANT RESISTANCE IN GROUNDNUT GENOTYPES AGAINST GELECHIIDAE INSECT PESTS WITH SPECIAL REFERENCE TO LEAF BUD BORER, Anarsia ephippias (Meyrick)
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Date
2015
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Acharya N.G. Ranga Agricultural University
Abstract
The present investigations on “Studies on host plant resistance in groundnut
genotypes against gelechiidae insect pests with special reference to leaf bud borer,
Anarsia ephippias (Meyrick)” was carried out at dryland farm, S. V. Agricultural
College, Tirupati. Seasonal incidence of gelechiidae insect pests (groundnut leaf miner
and leaf bud borer), was studied on three popular genotypes of groundnut viz., K-6,
Narayani and Dharani. Correlation study was done by taking into consideration the
means of weather parameters of 2 weeks preceding the SMW and correlated with
weekly observations of incidence of gelechiidae insect pest complex. The results
indicated that leaf bud borer incidence on popular genotypes of groundnut
(Dharani+K6+ Narayani) was negatively correlated with Max T, Min T, SS hours and
rainfall, positively correlated with RH-I, RH-II, Mean RH and W. V. Kmph. The
correlation studies with groundnut leaf miner indicated that GLM infestation was
negatively correlated with Max T, Min T, W. V. Kmph, rainfall and positively
correlated with RH-I, RH-II, Mean RH and SS hours.
From the results of screening experiment the genotypes ASK-2013-1, K-1563
and TCGS-894 were ranked as highly resistant, TCGS-1156 and K-1628 were ranked
as moderately resistant and Narayani and K-6 were ranked as susceptible towards their
reaction leaf bud borer. Genotypes TCGS-894 and TCGS-1097 were ranked as highly
resistant, ASK-2013-1 was ranked as moderately resistant and Narayani, K-1563, K-4
and Dharani were ranked as susceptible towards their reaction to groundnut leaf miner.
Results from the studies on biology of leaf bud borer indicated that except for
the incubation period, no significant differences were observed in the biological
characters of leaf bud borer, also the results of investigation on the ovipositional and
larval preference infer that no significant differences were observed among the test
genotypes in terms of number of eggs laid and larval orientation. Correlation with
physical characters of groundnut genotypes tested for their reaction to leaf bud borer
revealed that the trichomes and leaf thickness had shown significant negative
correlation with fifth instar duration and chlorophyll content was significantly
positively correlated with total life span. Correlation with biochemical constituents
revealed that proteins had significant negative correlation with incubation period and
fifth instar duration; phenols showed a significant positive correlation with fifth instar
duration; reducing sugars showed positive correlation with incubation period, fifth
instar duration, and a negative significant correlation with post-oviposition period.
Results from the studies on the biology of groundnut leaf miner showed
significant difference with the biological parameters fourth instar duration, fifth instar
duration, total larval duration and total life span; results of investigation of the
ovipositional and larval preference shows a significant difference among the genotypes
in terms of number of eggs laid and larval orientation. Correlation with physical
characters of groundnut genotypes tested for their reaction to leaf miner revealed that
the trichomes had shown negative correlation with incubation period, third instar
duration, fourth instar duration, total larval duration and total life span; thickness had
shown negative correlation with incubation period, fourth instar duration, total larval
duration and total life span; chlorophyll had not shown any significant correlation with
any characters. Correlation with biochemical constituents of groundnut genotypes tested
for their reaction to leaf miner revealed that the proteins had shown significant negative
correlation with incubation period, fourth instar duration, fifth instar duration, and total
larval duration and total life span; phenols showed significant positive correlation with
third instar duration, fourth instar duration, fifth instar duration, total larval duration and
total life span; reducing sugars showed significant positive correlation with incubation
period and total life span.
Description
D5371
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