BRIEF STUDY ON THE INSECT PESTS OF JACKFRUIT IN NADIA DISTRICT OF WEST BENGAL

N.M. NGANGOM¹*, B. BANDYOPADHYAY^2
1Department of Agricultural Entomology, Bidhan Chandra Krishi Viswavidyalaya, Mohanpur, 741252, West Bengal, India
²Department of Agricultural Entomology, Bidhan Chandra Krishi Viswavidyalaya, Mohanpur, 741252, West Bengal, India
* Corresponding Author : ng.nong12@gmail.com

Received : 31-10-2018     Accepted : 12-11-2018     Published : 15-11-2018
Volume : 10     Issue : 21       Pages : 7461 - 7467
Int J Agr Sci 10.21 (2018):7461-7467

Keywords : Jackfruit, insect pests, Diaphania, seasonal incidence, damage, correlations
Conflict of Interest : None declared
Acknowledgements/Funding : Authors are thankful to Department of Agricultural Entomology, Bidhan Chandra Krishi Viswavidyalaya, Mohanpur, 741252, West Bengal, India. Authors are also thankful to Research Unit, AICRP on Tropical Fruits, BCKV, Mondouri.
Author Contribution : All authors equally contributed

Jackfruit, Artocarpus heterophyllus Lamarck, is a fruit tree with multiple uses and potentials. It is said to be attacked by over 35 species of insect pest, but very little work has been done on it. A field survey was carried out to make a general assessment of the insect pest scenario and a field study was done to record the major and other important insect pests and their seasonal activities, at the Research Unit, AICRP on Tropical Fruits, BCKV, Mondouri, West Bengal during April, 2011 to June, 2012. The jackfruit shoot and fruit borer, Diaphania caesalis Walker (Pyralidae: Lepidoptera) was found to be the major pest. Other important insect pests found causing damage were the jackfruit bud weevil, Ochyromera artocarpi Marshall (Curculionidae: Coleoptera), bark eating caterpillars, Indarbela sp. (Metarbelidae: Lepidoptera) and the trunk borer, Batocera rufomaculata De Geer (Cerambycidae: Coleoptera). The study results revealed that Diaphania caesalis remains active and causes damage to jackfruit from October to June. Maximum shoot damage (34.20%) was recorded in January while the least was in May-June. Mean shoot damage was high in the east (40.45%) and south (37.66%) faces of the plant canopy as compared to the north and west canopy faces. Statistical analysis revealed that the activity of Diaphania caesalis had a positive correlation with the maximum relative humidity. Maximum fruit damage (32.96%) was observed during June. The incidence of bud weevil was observed from December to April and damage to young buds was highest (17%) during January while lowest (3%) during April. Bark eating caterpillars were seen infesting (14%) jackfruit trees almost all round the year. Infestation symptoms of the trunk borer, too, was observed in the field almost all round the year. 18% of the trees were infested and out of these, 44.44% were killed.

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