Population Dynamics and Management of Hadda Beetle, Henosepilachna vigintioctopunctata (Fab.) on Indian Ginseng, Withania somnifera (L.) Dunal
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Date
2022
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Abstract
The investigation entitled „Population dynamics and management of
hadda beetle, Henosepilachna vigintioctopunctata (Fab.) on Indian ginseng,
Withania somnifera (L.) Dunal‟ was conducted at Entomology Department,
S.K.N. College of Agriculture, Jobner (Rajasthan) during Kharif, 2021. The
study on the population dynamics revealed that the infestation of hadda
beetle, Henosepilachna vigintioctopunctata (Fab.) (grub and adult) started in
the first week of September and reached at peak in second week of October.
Hadda beetle population (grub and adult) had significant positive correlation
with maximum temperature (r=0.64), while the minimum temperature, relative
humidity and rainfall showed non-significant correlation with it.
The population of hadda beetle, H. Vigintioctopunctata (egg batch)
had significant positive correlation with maximum temperature (r= 0.65) and
non-significant correlation with minimum temperature, relative humidity and
rainfall.
The natural enemies of insect pests recorded in the Indian ginseng
were chrysopid, Chrysoperla zastrowi arabica (Henry et al.), Camponotus
compressus (Fab.), Monomorium indicum Forel and spider. Their populations
were found in traces only. Therefore the population could not be recorded.
The duration of egg, grub, pupa and adult stages were found to be
7.7, 14.5, 5.9 and 57.5, days respectively. Both grubs and adults were found
destructive in nature. The average body length of 1st, 2nd, 3rd and 4th instar
grub was 2.05 ± 0.34 mm, 3.03 ± 0.24 mm, 4.18± 0.10 mm, 6.21± 0.27 mm
and 3.11± 0.29 mm, respectively. The average body breadth of 1st, 2nd, 3rd
and 4th instar grub was 1.11±0.17 mm, 1.42± 0.06 mm, 1.89± 0.25 mm and
3.11± 0.29 mm, respectively. The average pre pupal length was 5.01± 0.46
mm and breadth was 2.71± 0.33 mm. The average pupal length was 5.98±
0.05 mm and breadth was 3.64± 0.24 mm. The average body length of male
was 6.21± 0.17 mm and breadth was 4.62± 0.28mm, whereas in female the
length was 7.15± 0.28 mm and breadth was 5.19± 0.27mm.
Out of eight biopesticides and botanicals tested against hadda beetle
on Indian ginseng crop, revealed that azadirachtin (0.03 EC) 5 ml/ l proved to
be most effective followed by Neem oil and Neem seed kernel extract (5%)
and B.bassiana (1.15 WP). The treatment ofL. lecanii (1.15 WP) and M.
anisopliae (1.15 WP) were ranked in middle order of efficacy, while the plant
products, viz., Karanj seed extract (5.0 %) and Karanj oil proved to be the
least effective.