The efficacy of six eco-smart insecticides, Dipel 2x 6.4% WP (Bacillus
thuringensis AI), Biofly 100% WP (Beauvaria bessiana AI), Radiant 12% SC
(Saccharopolyspora spinosa AI), Mectin 1.8% EC (Streptomyces avermitilis AI),
Nimbecidine 0.03% EC (Azadirachtin AI) and Bio-Power 50% EC (Beauvaria
bessiana AI), were tested against eggs, larvae and pupae of the jasmine moth,
Palpita unionalis Hb. and its parasitoid Apanteles syleptae under laboratory
conditions. Data indicated that all tested insecticides had ovicidal activity
against P. unionalis. Mectin was the most toxic among the tested insecticides
against the egg stage, followed by Radiant or Dipel 2x, and their respective
values of LC50 were 0.005 cm/l, 0.006 cm/l and 0.055 g/l. Dipel 2x was the
most toxic insecticide to the 1st instar larvae of P. unionalis, whereas
Mectin was the most toxic to both the 3rd and 5th instar larvae. Also, the
results revealed that Mectin was the most effective against the pupal stage,
followed descendingly by Radiant and Dipel 2x. The toxicity index values
showed a superior efficiency of Mectin at LC50 (100%) against eggs, 3rd and
5th instar larvae, and pupal stage, whereas Dipel 2x showed such superior
efficiency at LC50 (100%) only against 1st instar larvae. The results showed
that the percents of pupation and emergence of moths were significantly
different in all treatments compared to control, while deformed pupae and
malformed adults were insignificantly different when fifth instar larvae were
treated with the tested insecticides. Moreover, the rate of P. unionalis
adult emergence from treated pupae was concentration-dependent and
significant differences were found between insecticide treatments and
control. Generally, Mectin, Radiant and Dipel 2x caused the highest impacts
on adult emergence and malformed adults percentages. Regarding the toxicity
of insecticides to the endoparasitoid A. syleptae, the treated cocoons
developed to adult stages with no significant differences compared to
control. Meanwhile, the longevity of the emerged parasitoid adults did not
differ among the insecticides treatments and control.
Deteriorating Effects of Methoxyfenozide on Survival, Development and Metamorphosis of the Olive Leaf Moth, Palpita unionalis (Hübner) (Lepidoptera: Pyralidae).
