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.
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 niori. 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)-
The paper presents the anatomical features of bamboo leaves in transverse
section for 26 bamboo species underseven genera occurring in Bangladesh both in wild
and in cultivation. The results are presented in a tabular form. The findings indicate that
anatomical features ofbamboo leavesin transverse section work as taxonomic characters
at species level. The paper also provides a dichotomous key to identify bamboo species
occurring in Bangladesh based on leaf anatomical characteristics.
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.
The paper describes the fibre length and ray height of the five tree species,
namely Calophyllum polyanthum Wall., Garcinia cowa Roxb., G. xanthochymus
Hook., Kayeafloribimda Wall, and Mesuaferrea Linn, of the family Guttiferae. In
G. cozva and G. xanthochymusthe fibre length and ray height are higher and longer
than those of the other species. These two microscopic features work as good
characters in delimitating the species of Guttiferae. There is a progressive trend
of increase of fibre length and ray height from near pith to sapwood for all the
species
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