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
An attempt was different locations of Bangladesh. In this study, comparative season wise survey was conducted during
2010-2015. Disease incidence % of six commercially cultivated medicinal plants viz. Ashwagandha
(Withania somnifera L.) Dunal, Gritakanchon (Aloe indica L.), Kalomegh (Andrographispeniculata Nees),
Tulsi (Qcimwn sanctum L.), Basok (Adhatoda vasica Nees) and Shotomoly (Asparagus racemosus L.) was
recorded. Common diseases on all the six plants were recorded which included root rot and leaf blight in
Ashwagandha, leafspots and collar rot in Gritakanchon, Powdery mildew and root rot in Tulsi, leafblight
and collar rot in Kalomegh, wilting and die-back in Basok, tuber rot and stem rot in Shotomoly. The causal
organisms were identified as Fusarium equiseti (Corda.) Sacc., Alternaria altemata (Fries) Keissler,
Cochliobolus lunatus (Nelson & Hassig), Rhizopus stolonifer (Ehrenberg ex.
Fusarium oxysporiiun (Schlecht), Colletotrichum sp. respectively. The study revealed that most of the
incidences of the diseases were found in monsoon than pre-monsoon comparatively. Moderate to severe
damage by the diseases were observed in all the six medicinal plant highest (91.45%) disease incidence was
recorded in Ashwagandha for root rot disease and lowest (68.05%) disease incidence was recorded in
Shotomoly for the same disease.
Lizard diversity in the Chittagong University Campus (CUC) was studied from August 2012 to
December 2014. Seventeen species belonging to four families (Agamidae, Gekkonidae, Scincidae and
Varanidae) and eight genera (Calotes, Gekko, Hemidactylus, Eutropis, Lygosoma, Scincella,
Sphenomorphus and Varanus) under the Order Squamata were recorded. Family Scincidae comprised the
highest number of species (7 i.e., 41.18%) and Agamidae was the lowest (2 i.e., 11.76%). Status,
distribution and habitat of the lizards in the CUC have been discussed.
Rajkoroi (Albizia richardiana King and Prain) is an important tree species
extensively planted as fuel wood and timber in home garden and road sides as avenue
tree in the southern part of Bangladesh. Volume table of this rajkoroi species has been
prepared by deriving volume equations. 15 selected model were tested for deriving
volume equation by regression technique. Among them the logarithmic model log(V)=
a + b log (G) for one way and log (V) = a + b log (G) + c log(H) for two way analysis
appeared to be the best model for estimating the rajkoroi tree volume. Estimated
volume table is applicable for any size of rajkoroi tree planted of the southern part of
Bangladesh.
Koroi (Albizia procera) and arjun (Terminalia arjuna) are the two important species
included in the plantation programme in the central part of Bangladesh. Volume tables of these
two species planted in the area have been prepared. These volume tables are applicable for small
and medium sized trees of the respective species planted in the area.
Despite the increased recognition of the significance of market dynamics of homestead
forestry, research on the subject has remained strikingly limited. This research focuses on selected
aspects of marketing of homestead forestry products in two areas (Habilashdip and Chunati
Unions) in the district of Chittagong. The study mainly probes into principal actors in the market,
channel of marketing (for example grower-middlemen, middlemen-consumer etc.) the trends on
domestic consumption and sale of homestead agroforestry products, and the major problems (for
example absence of cooperative, poor storage facility, middlemen dependency) associated with
marketing. A number of measures for better marketing of homestead agroforestry products have
been suggested. The article ends with an exhortation for increased research on marketing of
homestead forestry.
Experimental planting with Aquilaria malaccensis Lamk. was undertaken to assess its
suitability on denuded hilly areas of Chittagong, Bangladesh. Germination of the species was 70
percent, and the seedlings attained a height of 40-60 cm in the nursery at the age of one year.
Average survival of the out-planted seedlings in four locations was 34.7 percent with 1.85m mean
height and 1.92 cm mean diameter after three years. Survival and seedling increment decreased
with increasing height of hill slope, apparently because of gradual low soil moisture content.
Strong and direct sunshine seemed to have adverse effect on seedling survival. The prospect of A.
malaccensis appeared to be uncertain for the denuded areas. However, further investigation needs
to be undertaken.
Sundarbans, the largest single continuous tract of natural mangroves in the world, is endowed with a diverse group of plants and animals and has recently been given the status of ‘World Heritage Site’ by the UNESCO.Thispaper gives a briefaccount of 31 species of insect pests attacking Sundarbans mangroves of Bangladesh. The pests include five species of defoliators, three stem borers, eight fruit borers, two gall makers, one sap sucker, one root feeder and 11 wood borers. These include 17 specks of Coleoptera, 11 species of Lepidoptera, two species of Diptera and one species of Homoptera.
This paper deals with detailed macroscopic and microscopic characteristics of five timber species, namely Calophylluni polyanthum Wall., Garcinia cowa Roxb., G. xanthochynius Hook., Kayea floribimda Wall, and Mesuaferrea Linn, of Guttiferae from Bangladesh. Dichotomous keys based on both the macroscopic and microscopic features have been developed for their identification.
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.
Antheraea paphia Linn. (Saturniidae : Lepidoptera) is a wild silkworm that gives us tassar silk of commerce. The dark buff-coloured silk is coarse and very strong, but of inferior quality a,s compared to that obtained from the domesticated silkworm, Bonibyx mori. This wild
insect is not domesticated, and cannot be reared in confinement on a commercial basis. In 1999, some trees of a 3-year old telsur (Hopea odorata Roxb.) plantation in the campus of the Bangladesh Forest Research Institute, Chittagong were found infested by a group of wild silkworm. The larvae were found feeding on the tender foliage of the upper canopy of the trees and were kept under observation. They were pale green with a yellow line at each side and rather bulky, distinctly segmented and smooth-bodied except for rows of ornamental metallic spotsand tubercles bearing clusters of short spines (Fig. 1). The full-grown larvae were about 10 cm long. Pupation occurred in oval cocoons with a compact surface (Fig. 2). The cocoons were formed in rolled leaves orsuspended by a thick silken cord from a twig. The cocoons were collected and reared to adults which were identified as Antheraea paphia Linn. (Saturniidae : Lepidoptera). The adult female is a broad-winged moth with a wing-span of about 12 cm. It is bright yellow with a circular semi-transparent area or ‘eye’ on each wing(Fig- 3)
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