of novel insecticides to Trichogramma chilonis and Snellenius
maculipennis, the potential parasitoids of castor semilooper
Duraimurugan* and M. Lakshminarayana
Section, ICAR-Indian Institute of Oilseeds Research, Rajendranagar, Hyderabad-500
Author E-mail: firstname.lastname@example.org
Paper received :
Revised received :
Accepted : 07.03.2018
Aim: The present
investigation was undertaken to evaluate the toxicity of seven novel chemical
and biological insecticides [flubendiamide 39.35 SC, chlorantraniliprole 18.5
SC, emamectin benzoate 5 SG, novaluron 10 EC, indoxacarb 15.8 EC and two Bacillus
thuringiensis var. kurstaki (Btk) formulations] and five
conventional chemical insecticides (dimethoate 30 EC, malathion 50 EC,
monocrotophos 36 SL, profenofos 50 EC and lambda-cyhalothrin 5 EC) against
the parasitoids of castor semilooper.
Methodology: The toxic effect
of insecticides was evaluated by treating the parasitized eggs using an
atomizer in the case of egg parasitoid, Trichogramma chilonis, while
topical bioassay and dry film residue method was used against pupal and adult
stages of larval parasitoid, Snellenius maculipennis, respectively.
The effect was categorized as per International Organisation for Biological
Control Safety Classification.
Results: The toxicity of
insecticides against T. chilonis revealed that Btk formulations,
flubendiamide, chlorantraniliprole, indoxacarb and novaluron had lesser
effect on adult emergence and categorized as harmless (< 30% mortality).
Topical bioassay with pupae of S. maculipennis revealed that Btk
formulations, novaluron, flubendiamide, chlorantraniliprole, emamectin
benzoate, indoxacarb, dimethoate and profenofos were rated as harmless (<
30% mortality). Dry film residue method using adults of S. maculipennis
revealed that Btk formulations, novaluron, flubendiamide and
chlorantraniliprole were rated as harmless (< 30% mortality).
Interpretation: Btk formulations,
flubendiamide, chlorantraniliprole and novaluron were found harmless to both
egg parasitoid, T. chilonis and larval parasitoid, S. maculipennis.
These safer insecticides can be incorporated in IPM module to unify the safe
and sustainable use of chemical and bio-control methods.