Evaluation of eggplant (Solanum melongena L.) genotypes for field resistance against major insect pests
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Date
2007
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Publisher
CCSHAU
Abstract
Twenty-five genotypes of eggplant were evaluated for field
resistance during 2006 against major insect pests namely, shoot and
fruit borer, Leucinodes orbonalis (Guenee), whitefly, Bemisia tabaci
(Gennadius), leafhopper, Amrasca biguttula biguttula(Ishida)and lace
wing bug, Urentius sentis Distant. On the basis of mean number of
sucking insect pests at peak infestation period, three resistant (PB–64,
Ganaur and Pb Barasati), three moderately resistant (Pb. Jamunigola,
Sel-4 and HLB–12), three susceptible (BB–102, CH–157–16–4 and H–
19–3) along with two check genotypes (Hisar Pragati and CH–157–16–4)
were selected for elaborate studies. Similarly the genotypes were
classified based on infestation level of fruits by shoot and fruit borer on
number basis as one tolerant (HLB–12), two susceptible (NDB–28–2 and
BB–46), five highly susceptible (BB–102, APAU–4, Sel–4, BB–16–3 and
(H–157–16–4) and two check genotypes (Hisar Pragati and BR–112).
The resistant genotypes harboured significantly (p=0.05) less
population of leafhopper (1.5 to 2.0 nymphs/leaf), whitefly (1.1 to 1.5
adults/leaf) and lace wing bug (1.4 to 1.8 nymphs and adults/leaf)
than the susceptible genotypes manifesting 5.0 to 5.5 leafhopper/leaf,
4.9 to 5.1 whitefly/leaf and 2.3 to 2.5 lace wing bug/leaf at the peak
infestation period. Similarly the tolerant genotype HLB-12 exhibited
significantly (p=0.05) less (29 %) fruit damage by shoot and fruit borer
than the highly susceptible genotypes (42.00 to 61.50 % fruit damage).
-ii-
The impact of trichome density on leafhopper (r = –0.84), whitefly (r = –
0.90) and lace wing bug (r = –0.62) was negative and significant.
However, except leafhopper where the trichome length (r = –0.62), had
shown negative and significant correlation with nymph population, the
impact of trichome length was non-significant with whitefly and lace
wing bug incidence. Correlation of thickness of pericarp (r = 0.80) and
mesocarp (r = 0.70) were positive and significant, while the impact of
fruit length was non-significant with the incidence of shoot and fruit
borer.
Among phytochemicals in leaves, moisture, crude protein, total
sugars, nitrogen contents were positive and significant while phenols
were negative and significant with the incidence of leafhopper and
whitefly. Among phytochemicals in fruits, moisture (r = 0.89 ), crude
protein (r = 0.68), nitrogen (r = 0.69) contents were positive and
significant while total sugars (r = -0.67), fiber (r = -0.76), tannin (r = -
0.85) and phenol (r = -0.80) contents were negative and significant with
per cent fruit infestation by shoot and fruit borer. Mineral constituents
showed marginal effects on the incidence of sucking insect pests and
shoot and fruit borer.
Description
Keywords
Eggplant, Shoot and fruit borer, Leafhopper, Whitefly, Lace wing bug