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Reproductive Performances of Lady Bird Beetle, Menochilus Sexmaculatus (coleoptera: Coccinellidae) Under Different Food Sources

M.R. Amin
Department of Entomology, Hajee Mohammad Danesh Science and Technology University, Dinajpur

M.S. Hossain
Department of Crop Physiology and Ecology, Hajee Mohammad Danesh Science and Technology University, Dinajpur

K.S. Ahmed
Department of Entomology, Bangladesh Agricultural University, Mymensingh

A.B. Khan
Department of Crop Physiology and Ecology, Hajee Mohammad Danesh Science and Technology University, Dinajpur

M.H.R. Hafiz
Department of Crop Physiology and Ecology, Hajee Mohammad Danesh Science and Technology University, Dinajpur

Abstract/ Executive Summary:

Reproductive performances of lady bird beetle, Menochilus sexmaculatus were studied using different food sources viz. bean aphids, mustard aphids, citrus aphids, scale insects and mealy bugs. It was found that the pre-oviposition period was highest (5.2 ± 0.37 days) when mealy bugs were supplied as food for the beetles, whereas it was lowest (3.8 ± 0.37 days) when the beetles fed on bean aphid. The longest (21.4 ± 0.50 days) and shortest (19.20 ± 0.58 days) oviposition periods of the beetles were found when fed on bean aphid and mealy bugs, respectively. The bean aphid as a food source resulted the highest fecundity (251.2 ± 12.59), however the highest (91.52 ± 1.84%) and lowest (82.20 ± 2.73%) hatching rates were obtained in case of the citrus aphid and mealy bugs, respectively. Incubation periods varied with the variation of food sources and it ranged from 2.80 ± 0.37 to 3.80 ± 0.37 days. The sex ratio of male and female was found 0.85: 1.00 and food sources did not significantly affect the sex ratio.

Keywords: Food sources, Lady beetle, Reproduction

Location: Field Laboratory of Bangladesh Agricultural University, Mymensingh

Start Date: 00-00-2009

End Date: 00-00-2009

Program Area: Pest Management

Commodity: Insects

Objectives:

1. To know the effect of various food sources on the reproduction performances of lady beetle with a view to mass rearing of this predator.

Methodology:

Collection and rearing of nsect: Adult male and female M. sexmaculatus were collected from the Field Laboratory of Bangladesh Agricultural University, Mymensingh. These beetles were sexed and paired in petridishes (9.0 × 1.5 cm). Each morning fresh bean shoots and inflorescence infested with aphids were supplied in each petridish to provide food for the predators. The petridishes were examined daily to ovserve oviposition. Eggs were laid on bean pod or stem or leaves in the petridishes. After hatching, the larvae were transferred into petridishes (9.0 × 1.5 cm) and reared till adult emergence. Ten larvae were reared in each petridish. The predators were provided with aphids every day and continued until pupation. The petridishes were kept undisturbed during pupal period. The newly emerged adults were placed to other petridishes having one male and one female for mating and laying eggs. This procedure was continued for obtaining large number of adult beetles for the experiment. Observation of reproductive performances: To observe the reproductive parameters viz. pre-oviposition, oviposition, incubation period, fecundity and survival rate, the newly emerged adult males and females were collected from the mass culture. They were confined in pairs in the petridishes for mating. A single pair of male and female was kept in each petridish (9.0 × 1.5 cm). The adults were provided with bean shoot, inflorescence or stem with bean aphid (Aphis medicaginis), mustard shoots, pods and leaves with mustard aphids (Lipaphis erysimi), citrus shoots, pods and leaves with citrus aphids (Taxoptera citridus) scale insects (Aonidiella aurantii) of known number and mealy bugs (Pseudococcus virgatus) of known number as their food. The foods were supplied every morning and five petridishes were maintained for each type. It was observed that mating generally took place 3 to 4 days after the adult emergence. It occurred at different times and usually started from the early morning, and the duration of copulation varied from 30 minutes to 2.5 hours. It was observed that the females did not lay eggs just after emergence. The time elaped between the date of adult emergence and the first egg deposition was considered as pre-oviposition period. After mating, the female laid eggs and the beetles were transferred to other petridishes. The eggs were observed everyday to note the hatching period. The larval and pupal periods were also recorded. The total number of eggs laid by each female during every 24 hours were counted and kept in separate petridishs. The viability of the eggs was determined by allowing them to hatch. Hatching period and hatching percentage of eggs were also counted. Statistical Analysis: Data obtained from the experiments were analyzed in computer using one factor Completely Randomized Design (CRD) and means were ranked by Duncan’s Multiple Range Test (DMRT).

Source of Information: J. Agrofor. Environ. 3 (1): 187-189, 2009; ISSN 1995-6983

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Results showed that the 1st instar larval mortality ranged from 6.0 to 22.0%, 2nd instar 8.51 to 23.07%, 3rd instar 6.97 to 29.03%, 4th instar 15.00 to 36.36% and pupal mortality ranged from 12.00 to 42.85%. Results showed that different food sources have significant effect on the mortality of the immature states of M. sexmaculatus. It may be the cause of the suitability and nutritional quality of the foods.

Knowledge Management: Journal