Effects of Botanical Insecticides on the Egg Parasitoid Trichogramma Cacoeciae Marchal (Hym. Trichogrammatidae)
Abstract
181 words
This study was carried out to test the effect of the botanicals
azadrichtine and Quassin on the parasitoid Trichogramma
cacoeciae. For each of these, 2 formulatons were used i.e.,
Neemazal T/s Blank and Celaflor for azadrichtine and Alcohlic
and Water extracts for Quassin. In the study, adults (susceptible
life stage) of Trichogramma were exposed to glass plates
sprayed by the respective formulations or to host eggs sprayed
with the botanical formulations immediately after drying or after
6 days. The effect of time of egg spraying after parasitising
was also studied. Residues of Neemazal formulations on glass
plates harmful (Neemazal-Blank) or moderately harmful
(Celaflor) to T. cacoeciae adults. The two Quassin
formulations tested were harmless. When treated host eggs
were offered to adults T. cacoeciae, all the chemicals were
almost harmless. All tested insecticides significantly reduced
pupation, with the effect being maximum when host eggs where
sprayed two days after parasitism. It is therefore concluded
that both Azadirachtine and Quassin are relatively safe towards
T. cacoeciae and could therefore be used in combination with
Trichogramma releases in the management of lepidopteran
pests.
Subjects
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