Biology, Seasonal Incidence and Management of Acherontia styx Westwood On Sesame
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Date
2011
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UAS, Dharwad
Abstract
The sphingid, Acherontia styx Westwood has assumed a major pest status on
Sesame in North Karnataka. The investigations were conducted on biology, seasonal
incidence and management of A.styx Westw. on sesame during 2010-11. It was
interesting to record that, during off season (Nov-Feb) the pest survived on weed host,
Clerodendrum phlomidis completing one generation. A. styx is being recorded for the
first time on C. phlomidis.
The development of egg, larva, pre-pupa and pupal periods occupied 6.0±0.91,
19.55±0.23, 5.70±0.69 and 19.70±1.65 days on S. indicum and 6.0±0.67, 19.80±1.23,
6.50±0.85 and 20.3±2.99 days on C. phlomidis. In the first fortnight of July, the initial
population of sphingid was low with an average of 4.0 larvae per 10 plants with 30%
defoliation of S. indicum. The peak population was in August with 5.33 and 5.66
larvae per 10 plants with 38 and 42 per cent defoliation during first and second
fortnight, respectively.
Among the different chemical insecticides, flubendiamide 480 SC was
superior to rest of the chemicals followed by spinosad 48 SL, emamectin benzoate 5
SG, deltamethrin 2.8 EC and indoxacarb 14.5 SC. Among the ovicides, methomyl
was effective. The neem based insecticides, nimbicidine was effective followed by
NSKE 5%. Use of Trichogramma chilonis in three different doses Viz., T.chilonis
@75000, 150000 and 225000 revealed effectiveness of T. chilonis @ 1,50,000/ha
with egg parasitization of 72%.
Maximum grain yield was obtained with flubendiamide 480 SC (5.92 q/ha).
Among neem based insecticides, nimbicidine recorded higher grain yield (2.91 q/ha),
while NSKE 5% had minimum (2.48 q/ha). Grain yield of 3.97 q/ha was obtained
with T. chilonis @ 1,50,000/ha. Benefit:Cost ratio of different chemicals revealed
higher B:C ratio (3.62) with flubendiamide 480 SC compared to other chemicals.
NSKE 5% treatment recorded only B:C ratio of 2.00.
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Agricultural Entomology