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
Insecticidal activity of ivermectin (Ivecop- 12), a derivative of ivermectin B,
produced by a soil actinomycete, Streptomyces avermitilis, was evaluated in laboratory
against the larvae of bamboo leaf roller, Crypsiptya coclesalis Walker (Lepidoptera:
Pyralidae), a major defoliator of bamboos in nurseries, plantations and natural forests.
The study was
doses. Results revealed that ivermectin is
conducted with eight treatment concentrations of lethal and sub-lethal
highly toxic and induce larval mortality
when applied separately on host plant leaves and larvae, on leaves and larvae of the
insect pest together and leaf rolls containing larvae. The nature of treatment affects the
larval mortality. On the basis of two trials, results revealed that treatment of leaves and
larvae together showed cent percent larval mortality by the 0.15% concentration,
whereas treatment of leaves alone and leaf roll exhibited cent percent mortality by the
concentration of 0.3%. Larval treatment showed hundred percent mortality by 1.2%
concentration. The LC50 value of the tested product was worked out to be 0.012239,
0.076789, 0.010833 and 0.051116% for leaf and larval treatments separately, leaf and
larval treatments together and leaf roll treatment respectively against the insect pest.
This clearly shows that ivermectin is more
through food.
The composition and diversity of native tree species in all topographical positions
of Dud-Pukuria Natural Forest in Chittagong (South) Forest Division, Bangladesh were
investigated. A total of 667 individual stems having dbh >10 cm were recorded from 3.2
hectare sampled area. These 77 native tree species belongs to 32 family and 53 genera
This paper presents some indigenous or traditional technical knowledge on jhum
(shifting cultivation) cultivation and management in Bandarban hill district in
Bangladesh. These include indicators for jhum land selection, fire management in jhum
field, three- phase seed sowing technique in jhum, use of colored flower plants to keep
away insects from jhum, slope differentiation of hills in crop selection, use of local
climate for crop selection, altitude and wind velocity in crop selection, indigenous seed
collection and germplasms management, indigenous seed storage method, seed
distribution, indigenous nursery method for raisings citrus seedlings, and indigenous
ginger storage method by the Bwam community in Bandarban hill district of
Bangladesh. Three-phase seed sowing technique in jhum is the new documentation of
indigenous knowledge. An integration of indigenous and scientific knowledge will
help to develop sustainable management of indigenous farming practices.
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.
Lotkon defoliator, Cyclosia papilionaris Drury (Zygaenidae:Lepidoptera) is a major
insect pest of lotkon (Baccaurea ramiflora Lour.) in Bangladesh. The larva feeds on young
leaves and cause defoliation seriously affecting the growth of the tree. Description,
distribution, nature and impact of damage, host plants, life stages, number of
generation, seasonal abundance and management of the pest has been described. The
peak infestation occurred during July and August. The incidence is more acute in the
hilly areas than in the plains. The pest could be controlled by the foliar application of
malathion (Malathion 57 EC) at 0.1% concentration.
The response of rajkoroi (Albizia richardiana King and Prain) wood for making
pulp in NS-AQ (Neutral Sulphite Anthraquinone), soda, soda-AQ and kraft pulping
processes was assessed by different alkali doses and pulping time. The temperature
was maintained at 170°C in all cases. Results showed that the species was not suitable
for making pulp in NS-AQ process. Pulps could be made in soda process but the
amount of uncooked material (rejects) was high. Addition of 0.1% AQ in soda liquor
gave better results in delignification. The species responded very well towards kraft
process. Bleachable grade kraft pulp was obtained even with 14% active alkali with a
pulp yield of 48.2%. The pulp yield of rajkoroi was
species widely used in pulp and paper mills of Bangladesh.
Hand sheets from soda, soda-AQ and kraft pulp of rajkoroi were made. The
physical strength properties likely tear, tensile and burst were evaluated. Kraft pulp
was superior to the pulp produced either in soda and soda-AQ processes but slightly
inferior to the pulp produced from commonly used hardwood species. The pulp of this
species could be blended with imported softwood pulp for making moderate quality
writing, printing and wrapping paper.
In this paper the anatomical properties and extractive content of four traditionally
used wood species, viz. itchri (Anogeisus acuminata Wall.), kochoi (Bridelia retusa
Spreng.), sil-bhadi (Garuga pinnatn Roxb.), and goda (Vitex pedunciilarlis Wall.), of
Bandarban Hill District in Bangladesh have been studied. All the wood species under
the study have tyloses with narrow lumens. The extractive content of the sapwood of
the species varies from 4.16 to 6.89 percent in cold water. The highest percentage was
in itchri (6.89%) followed by goda (6.65%) and 5.9% in kochoi and lowest in sil-bhadi.
The hot water extractive content varies from 6.88 to 8.76 percent with highest percent in
itchri (8.76) followed by sil-bhadi (8.08), goda (8.02) and 6.88 in kochoi. The heartwood
extractives in cold water were 7.21% in goda followed by 7.12, 6.43 and 6.15% in itchri,
kochoi and sil-bhadi respectively. The hot water extractive content was higher in itchri
(9.84%), followed by 8.97% in sil-bhadi, 8.7% in goda and 7.75% in kochoi. Both
anatomical properties and extractives contents are
durability of these species.
A comparative growth study of Avicennia officinalis, A. alba and A. marina along
the eastern shorelines of Bangladesh showed an average annual diameter increments of
0.99, 0.90 and 0.97 cm respectively for plantations varying 11 and 16 years age. Average
annual height increments of these species were 0.31, 0.37 and 0.31 m respectively.
Annual volume production per tree was 0.025, 0.025 and 0.024 m3 respectively. All the
individuals of Avicennia species had a promising growth and the plantation was
successful along the eastern coast of the country. On the contrary much human
interference was observed on the established plantations. The growth of Avicennia
officinalis, A. alba and A. marina showed that plantation areas and newly accreted lands
may be suitable for planting with Avicennia species.
The effect of nailing density in agar formation through artificial wounding was
observed in agar trees. Five different nailing densities like; 1 cm x 1 cm, 2 cm x 2 cm, 3
cm x 3 cm, 4 cm x 4 cm and 5 cm x 5 cm were used as treatments in 25 selected agar
trees in three locations with the five experimental sites, Boroduara (Chittagong),
Fashiakhali (Cox’s Bazar), Bagaihat (Rangamati), Bagmara and Lathitila (Moulvibazar).
The age of the treated agar trees were 8,10 and 15 years respectively. The experiment
was conducted in June 2008 and agar wood core samples were
of the nailing treatments. Among the different densities, 4 cm x 4 cm nailing distance
was found to be the best nailing density for maximum agar formation. On an average,
95% oleoresin deposit was found in 15 years old agar tree.
Aboveground nighttime respiration behavior of Kandelia obovata Sheue, Liu and
Yong was measured from 10 sample plants growing in the mangroves of Okinawa
Island, Japan. The dependence of the respiration on the tree size was successfully
represented by a power function of Do.1H2H. The respiratory behavior of K. obovata was
found dependent to size and the exponent was close to 3/4. The size-dependence of
respiration could be successfully represented by a power function of D0.1H2H.
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