Rearing of 7 Spotted Ladybird beetle (Coccinella.pdf
1. Rearing of 7 Spotted Ladybird beetle
(Coccinella septempunctata) feeding on
bean aphid
Researcher:
Avin Kharel
Kharel Avin (IAAS)
2. INTRODUCTION
• "Ladybird" named has been assigned for the European beetle Coccinella septempunctata L.
for more than 600 years and extended all its relatives as the member of beetle family
Coccinellidae (Frank & Mizell, 2008).
• Coccinella septempunctata is the most common among all the species of ladybird beetle
found all over the world.
• They play a significant role in the biological control of the aphids.
• They are the voracious aphid feeder an average of about 30 to 77 per day (Sigdel et
al.,2016).
• According to University Extension Service, a single ladybird can prey up to 5000 aphids in its
lifecycle.
• They are predators in both adult and larval stages, with a voracious appetite and predatory
abilities (Oliveira et al., 2004; Olkowski & Thiers, 1990; Vandenberg, 2002).
4. LIFE HISTORY
• Ladybird beetles develop through 4 life stages: egg, larva, pupa and adult.
• Adult female lays about 200-300 eggs during her growing lifespan of about 2
months.
• Larva develops through four increasingly larger instars after hatching.
• They can have up to 5 generations per year.
• Egg to adult development time is about 6 weeks during the growing season.
• According to University Extension Service, a single ladybird can prey up to 5000
aphids in its lifecycle.
12. methodology
• Adult 7-spotted ladybirds were collected from IAAS farm (Lamjung Campus).
• Male and female were identified and paired in petri plate for mating.
• Eggs were collected from them and 10 eggs were used for the study of lifecycle and
predatory potential.
• After hatching, 10 larvae were placed in ten petri plate for replication and lifecycle was
studied.
• Bean aphids were also provided in all four instars and adult period. Aphids were provided
by counting the number.
• Life history parameters of were studied in bio control lab maintaining the temperature
25°C and 50-70% RH.
14. observation
S.N Stage Date Duration
1 Eggs 22th Jestha, 2079 3 days
2 Larvae 25th Jestha, 2079 7 days
3 Pupae 1st Asar, 2079 3 days
4 Adult 4th Asar, 2079
15. result
• Rearing of 7-Spotted Ladybird beetle was successfully carried out in bio control lab
of IAAS, Lamjung Campus.
• The total study period was 2 weeks from 22th Jestha 2079 to 4th Asar 2079.
• The predatory potential of different larval instars and adult was studied in which
the 4th instar larva is voracious aphid feeder.
16. discussion
J.S.Rana* and Jogesh Kakker Department of Entomology CCS Haryana Agricultural
University Hisar-125004, Haryana, India
• The incubation period was recorded to be 4.2 days with a range of 3.5-4.5 days. The
predator passed through four larval instars completing the average duration in 2.27,
1.81, 2.25, and 3.06 days, respectively. The total larval period was observed to be 9.39
days with a range of 8.2- 10.5 days. The pupal period lasted for 4.7 days with a range
4.0-4.9 days. (*Temperature: 20-23 °C , Aphid Species: Cereal Aphid, Sitobion avenae)
Avin Kharel Department of Entomology, Institute of Agriculture and Animal Science, IAAS
(TU) Nepal
• The observed incubation period was about 3 days. The total larval period was about 7
days and pupal duration was about 4 days. The difference in the life history might be
due to the difference in temperature as we observed the lifecycle at 28°C. Also the prey
of ladybird i.e. species of aphid which the ladybird feed made the differences in the
duration of lifecycle. (*Temperature: 28°C , Aphid species: Bean Aphid, Apis fabae)