BANGLADESH JOURNAL OF FOREST SCIENCE
A Half-yearly Peer Reviewed Journal of Bangladesh Forest Research Institute
A Half-yearly Peer Reviewed Journal of Bangladesh Forest Research Institute
The bagworm, Cryptothelea crameri Westwood (Psychidae : Lepidoptera) is an important pest of many ornamental, horticultural and forest plants in Bangladesh. The larva feeds on young leaves and tender bark by making and living within a portable bag of leaves, twigs, barks, spines, etc. The biology, host range, number of generations, and seasonal abundance of the pest have been dealt with in this paper. Brachymeria sp. (Braconidae: Hymenoptera) wasfound to parasitize its larva. The pestcould be collected and destroyed by hand. It could also be controlled by the foliar application ofmalathion (Malathion 57 EC) at 0.1% concentration.
Kadam (Anthocephalus chinensis (Lam.) Rich ex. Walp.}, a fast growing multipurpose tree species, is grown in the homesteads and planted in the forest areas of Bangladesh. The plantations of this species often suffer from the attack of the defoliator, Arthroschista (=Margaronia) hilaralis Walker (Pyralidae : Lepidoptera). This paper describes distribution, host plants, nature and impact of damage, life history, number of
generation, population fluctuation, natural enemies and management of the pest. The pest completes its life cycle within 23.0 + 3.0 days. It has 9-10 generations in a year. Younger trees, usually 2-5 years of age, were found most heavily infested. The peak infestation occurred during August-September. Two parasites, Apanteles balteatea Lal. (Braconidae : Hymenoptera) and Brachytneria lasus Walk. (Chalcididae: Hymenoptera), caused a mortality of about 40% of the pest population. Application of Thuricide (Bacillus thnringiensis) 40 WP or Malathion (malathion) 57 EC @ 0.1% concentration was effective in controlling severe infestation. Hand collection and destruction at the initial stage of infestation could suppress and provision of overhead orside shade for the tree could prevent the attack of this pest.
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