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Biological Investigation of the Mango Leaf Cutting Weevil, Deporaus Marginatus Pascoe, in Laboratory and Nursery

M. A. UDDIN
Senior scientific officer
Fruit Research Station, BARI, Binodpur, Rajshahi, Bangladesh

B. SIKDAR
Department of Genetic Engineering and Biotechnology, University of Rajshahi, Rajshahi, Bangladesh

Abstract/ Executive Summary:

The biological investigations were made in the laboratory and mango nursery on the oviposition behaviour and development of different stages of life cycle of mango leaf cutting weevil, Deporaus marginatus Pascoe along with its natural enemies. Female weevils were mated with males for less than 30 minutes and eggs were deposited singly on the tender leaves maneuvering with snout at some egg to egg distance followed by cutting the leaves which dropped on the soil. The work was conducted through a series of field experiments in the nursery supported by laboratory experiments from January, 2006 to December, 2008. The experiments were conducted at the Fruit Research Station, Rajshahi, Bangladesh. Observations were made on the occurrence of predators, parasitoids and pathogens in the laboratory and nurseries. Investigations were also made on any biocontrol agents damgeing weevil eggs, larvae, pupae and adults. Leaf-cutting weevils of each life stage were examined daily after maintaining the collections in Petri dishes. Female laid 7.14 eggs per mango leaf, usually on the dorsal side of midrib. The developmental period from egg to adult was 435.37 hours (19.06 days), the egg stage lasted for 47.83 hours (1.99 days), the three larval instars lasted 144.97 hours (6.04 days) and the pre-pupa and pupal stage took 93.40 hours (3.89 days) and 171.17 hours (7.13 days) respectively. The adult longevity was 47.50 days in male and 36.50 days in female. The larval development occurred in fallen tender cut leaves. Deporaus marginatus was hibernated as final instar larva during winter months when its population was not observed in the nursery. Ants and spiders were found to feed on immature larva of this insect. Ants and spiders were found to feed on the immatures of mango leaf cutting weevil, the former being the most active on immature prey.

Keywords: Deporaus marginatus, Oviposition Behaviour, Mango Nursery, Natural Enemies, Biocontrol Agents

Location: Fruit Research Station, Rajshahi, Bangladesh.

Start Date: 00-01-2006

End Date: 00-12-2008

Program Area: Pest Management

Commodity: Insects, Mango

Objectives:

Some work has been done in different countries on the biology of this pest. However, detailed information on its biology and its natural enemies is lacking and is essential for the management of this pest.

Methodology:

The research works on mango leaf cutting weevil, Deporaus marginatus Pascoe damaging mango plants were done through a series of field experiments in the nursery supported by laboratory experiments during the period from January, 2006 to December, 2008. The experiments were conducted in the Fruit Research Station, Rajshahi,

Source of Information: Indian J.Sci.Res. 5(2) : 133-141, 2014 ISSN : 0976-2876 (Print); ISSN : 2250-0138 (Online)

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The biological observations revealed that only the female weevils of Deporaus marginatus cut the tender pinkish leaves of mango plants after oviposition for the purpose of continuity of the life cycle. This insect became prevalent from March onwards till November in relation to increased temperature and relative humidity but was not present in winter months which were considered to be the period of hibernation and limiting factors for its abundance. Two types of predators such as ants and spiders were found to feed on the immatures of mango leaf cutting weevil, the former being the most active on immature prey. Further study is needed to explore the biotic potential of these predators in the mango agroecosystem.

Knowledge Management: Journal