TRITROPHIC INTERACTIONS OF CASTOR SEMILOOPER, Achaea janata L AND ITS ENDOLARVAL PARASITOID Snellenius maculipennis (Szepligate)
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Date
2017
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Acharya N.G. Ranga Agricultural University
Abstract
Laboratory studies on the “Tri-trophic interactions of castor semilooper,
Achaea janata L and its endolarval parasitoid Snellenius maculipennis (Szepligate)”
were carried out during 2016-17 at Insectary, Department of Entomology, S. V.
Agricultural College, Tirupati. Six varieties of castor viz., DPC-9 (Green zero
bloom), DCH-177 (Red single bloom), PCH-111 (Green double bloom), 48-1 (Red
double bloom), DCH-519 (Green triple bloom) and GCH-4 (Red triple bloom) were
grown in plastic pots during kharif 2016 from August onwards under net house
conditions. Excised leaves of equal maturity castor varieties with different blooms
were used for studying the biology of A. janata at 28 ± 2˚C temperature and 75-80
per cent RH.
Longest larval duration, adult longevity, total life cycle with more larval
weights and fecundity of A. janata were observed when reared on DPC-9 (14.42
±0.87 days; 13.15±0.93 days; 40.77 ± 01.52 days and 1.253 ± 0.129 g; 316.5 ± 20.07
eggs, respectively), indicating DPC-9 as the most preferred variety for growth and
multiplication of A. janata followed by DCH-177 (14.25 ±0.81 days; 13.00 ±0.72
days; 40.70 ±01.17 days and 1.202 ± 0.090 g; 276.5 ± 35.19 eggs, respectively).
The Shortest larval duration, adult longevity, total life cycle with less larval
weight and fecundity of A. janata were observed when reared on GCH-4 (12.42
±0.81 days; 12.75 ±0.73 days; 36.47 ±03.21 days and 0.925 ± 0.218 g; 234.25 ±
20.27 eggs, respectively) followed by DCH-519 (12.50 ±0.58 days; 12.65 ±0.58
days; 37.15 ±01.25 days and 1.191 ± 0.095 g; 231.0 ± 13.16 eggs, respectively),
recording as least preferred hosts for growth and multiplication of A. janata.
The performance of A. janata on the remaining varieties were in between
DPC-9 and GCH-4.
Approximate digestibility (AD) of third instar was highest when reared on
GCH-4 (0.953±0.003 mg) and lowest when reared on DCH-177 (0.469±0.191 mg).
Efficiency of conversion of ingested food (ECI) of fourth instar was highest
when reared on DPC-9 (0.840±0.190 mg) and lowest ECI were observed when
reared on GCH-4 (0.521±0.152 mg).
Efficiency of conversion of digested food (ECD) and consumption index (CI)
of fifth instar was highest when reared on DPC-9 (0.675±0.132 mg; 0.914±0.009
mg) and lowest efficiency of conversion of digested food (ECD) and consumption
index (CI) were observed when reared on GCH-4 (0.379±0.050 mg; 0.219±0.045
mg, respectively).
Protein content, total free amino acids, total carbohydrates and reducing
sugars were positively correlated with total larval duration, adult longevity, total life
cycle and fecundity of A. janata (statistically not significant). Total phenols content
was negatively correlated with total larval duration, adult longevity, total life cycle
and fecundity of A. janata. (statistically significant).
Per cent parasitization by S. maculipennis on A. janata larvae released on
castor varieties with different blooms was higher on PCH-111 (67.5±7.73 %)
followed by DCH-177 (63.3±31.97 %), 48-1 (61.2±10.38 %), DCH-519
(61.2±10.30 %), GCH-4 (60.4±12.50 %) and DPC-9 (50.7±15.32 %) (Not
statistically significant).
Biological parameters of parasitoid, S. maculipennis such as egg+larval
duration, cocoon duration, adult longevity and total life cycle, when larvae released
on different castor varieties at different blooms viz., DPC-9, DCH-177, PCH-111,
48-1, DCH-519 and GCH-4 were 5.25 to 5.75, 4.50 to 4.75, 3.50 to 3.75, 13.2 to
13.75 days, respectively.
Description
D5507
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