Toxicity of some insecticides to Trichogramma chilonis Ishii
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Date
2004
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Publisher
CCSHAU
Abstract
Studies on the influence of 12 insecticides viz. Lindane 20 EC, neem (Achook
0.03 %), profenofos 50 EC, triazophos 40 EC, chlorpyriphos 20 EC, fenvalerate 20 EC,
alphamethrin 10 EC, quinalphos 25 EC, carbaryl 50 WP, deltamethrin 2.8 EC, cypermethrin 25
EC and Bacillus thuringiensis (Halt 5 WP) on different biological parameters of T. Chilonis
using Corcyra cephalonica Stainton as laboratory host were carried at 27 1oc and 75 5 %
relative humidity in the Biocontrol Laboratory of the Department of Entomology, CCS Haryana
Agricultural University, Hisar.
Parasitization of C. Cephalonica eggs when exposed to T. Chilonis after
insecticidal treatment was highest (except control, 28.50 %) in B. Thuringiensis (22.13 %)
followed by neem (19.50 %). No parasitization was recorded when host eggs treated with
lindane, profenofos, chlorpyriphos, quinalphos, deltamethrin, and cypermethrin treated host
eggs. Parasitization in case of triazophos, fenvalerate, alphamethrin and carbaryl ranged
between 2.47 to 3.07 per cent. Adult emergence from such parasitized eggs was highest i n B.
RESULTS AND DISCUSSION
Thuringiensis (88.30 %) followed by neem (80.88 %) and lowest in carbaryl (38.46 %). Sex ratio
did not differ significantly among the treatments.
When parasitized eggs (3 days old) of C. Cephalonica were dipped in different
insecticidal solutions highest adult emergence (except control) was observed in B.
Thuringiensis (84.60 %) followed by neem (73.20 %). No adult emergence was observed from
parasitized eggs treated with lindane, profenofos, chlorpyriphos and quinalphos. Female
longevity among the insecticides was highest in B. Thuringiensis (18.00 days) while lowest in
carbaryl (0.25 days) and in control 20.10 days. Fecundity was highest in control (219.7 eggs)
followed by B. Thuringiensis (195.3 eggs). Lowest fecundity was observed in triazophos (116.4
eggs) which was at par with deltamethrin (121.1 days).
In residual toxicity test carbaryl was the insecticide which retained toxicity for
maximum number of days (15 days) followed by lindane (10 days). Any insecticide in residual
toxicity test did not influence adult emergence and sex ratio (per cent females in progeny).
When adults of T. Chilonis were exposed to cotton leaves after 0, 1, 3, 5, 7, 10 and 15 days of
spray only carbaryl caused mortality upto 15 days followed by lindane (10 days). On the basis
of LC50 values, lindane (0.00059 %) was found most toxic insecticide as compared to others.
Parasitization at LC50 was highest in B. Thuringiensis (84.51 %) and lowest in lindane (38.21 %).
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