Biology and Chemcial Control of Fily caterpillar, Polytela gloriosae fabricius (Noctuidae : Lepidoptera) on Spiderlily, Hymenocallis Littoralis L
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Date
1997-12
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Agricultural Entomology Department, N. M. College of Agriculture, Gujarat Agricultural University
Abstract
In the study of host range of P. gloriosae, six plant species viz. ,
spiderlily, zephyr lily, rain lily, dutch amaryllis, giant spiderlily and glory lily
were found as host plants. The pest was active during May to October.
In the study of biology of Poly/ela gloriosae Fabricius on
spiderlily, the eggs were found to be laying in masses on the apical and basal
portion of lower surface of leaves as well as on the inflorescences of
spiderlily . Freshly laid eggs were yellowish white in colour which changed to
deep yellow after one day and became dark brown prior to hatching. Eggs
I were hemispherical with flat base and prominently sculptured with numerous
ridges running from one polar end to another. Average length and breadth of
egg was 0.52 + 0.02 mm and 0.70 ± 0.02 mm, respectively. Average
incubation period and hatching percentage were 3.81 + 0.75 days and 89.20
± 4.63 per cent, respectively. The larval stage passed through six instars. The
average developmental period of first, second, third, fourth, fifth and sixth
•
larval instar was 2.40 ± 0.50, 2.56 ± 0.51, 2.84 + 0.69, 3.20 ± 0.71 , 3.04 ±
,
. .
0.68 and 3.12 ± 0.53 days, respectively. Total larval development period was
on an average 17.16 ± 1.31 days. Average duration of prepupal period was
2.20 ± 0.41 days. Average pupal duration was 10.48 ± 0.71 days.
Thoracic dorsum of adults were thickly covered with black hair
and marked with three pale orange coloured spots. The brown coloured fore
wing had a mosaic pattern consisting of yellow, red and black dots. The hind
wing was brown and the apical margin was provided with a yellow lining
with comb-like hairy pattern. Abdomen was black and it was thicker in
female than in male. The female and male adults measured on an average
15.58 ± 0.75 mm and 13.28 ± 0.71 mm in length and 35.70 ± 0.75 mm and
32.22 ± 1.12 mm in breadth across the expanded wings, respectively. The
average pre-oviposition, oviposition and post-oviposition period was 1.60 ±
0.60, 3.20 ± 1.01 and 2.25 ± 0.79 days, respectively. Average egg laying
capacity of female was 82.40 ± 22.83 eggs. The average longevity of female
and male was 6.65 ± 1.15 and 4.85 + 0.93 days, respectively. Total life cycle
occupied 35 to 42 days (Ave. 39.38 ± 2.56 days) in case of female and 34 to
40 days (Ave. 36.71 ± 2.29 days) in case of male .
The results oflaboratory trial on bioefficacy of various synthetic
insecticides against larvae of P. gloriosae revealed that spark 0.045 per cent
(deltamethrin 0.001 per cent + triazophos 0.044 per cent) was found to be
the best treatment giving higher larval mortality. Chlorpyriphos 0.03 per cent
and aiphamelhrin 0.005 per cent were at par with each other and stood next
. . . sis"QajW~t"\~ . . .
to spark. The other insectIcides, though~supenor over control were tound kss
effective than spark, chlorpyriphos and alphamethrin.
l'he results of laboratory trial on hioefticacy of neem hased
hotalllcal insecticides against larvae of P. g/oriosae revealed that treatment of
rakshak O. I per cent and azadex 0.15 per cent were at par with each other
and found to be the best treatment giving higher larval mortality. Necmark
0.5 per cent and neemactin 0. 15 per cent were at par with each other and
stood next to the trealrnent of rakshak and azadex. The other insecticides,
Sign if-ict.lVltllj
though superior over control were found less effective than rakshak and
f..
azadex.
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Citation
KAMLESHKUMAR SHANKARLAL PATEL_30687