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BANGLADESH JOURNAL OF FOREST SCIENCE

A Half-yearly Peer Reviewed Journal of Bangladesh Forest Research Institute

ISSN - Print: 1021-3279 | Online: -
Abstract:

Seven plant extracts and seven fungicides were tested to centre! the wilting disease of
Dnlhetjfrt sisstJf’ caused by Ftiwrtitrji srifafti f. Plant extracts of Viir.i
(Nishinda), AijJif/rtk’Wii inditB (Neem), (Vijiijujt tas/hcimi (Tulsi), Tagdei patuia (Gandha),
ftyrfftpiper (Bishkantali), AihrrMfl vasicfi (Basok) and Grutelfo ii-dfej (Thankuni) were
tested tn 100%, 50:. and 25:T conienFrdlion in Cnntroiling the vegetative growth of the fungus.
Basilieum inhibited the highest amount, about 56% growth of the culture. A. vasicn and I7,
jEgHndo wen? the second and third in controlling about 43% and about 42% of the vegetative
growth. C. asiotica controlled 40% while A. mdicn and T. jwtrda controied 39% and 37%. P.
In/drvpifi’r was the least effective antifungal that inhibited about 32% growth of the tested
fungus.

Abstract:

Ruhiwr seed oil is a promising by-product of rubber plant (Htweit lirasi/iensts MuelL Arg.),
lias so far been unknown to the rubber growers of Bangladesh. A Laboratorv-based research
was madft on different aspects of rubber seed oil of fourselected clones (RRlM-fiOO, RRIM-605,
PB-255 and GT-1J grown in toe country. Results show that rubber seeds of the clones contain
2844% edible oil which is will be cheaper than soybean and palm oil, Gas Liquid
Chromatography (GLC) analysis shows that the seed oil contains 83-89% essential unsaturated
fatly acids and 17-22% saturated fatty acid. On the other hand, the seed-cakes contain 29-39%
proteins which is determined by the Macro KjeJdahl Procedure Can he used as animal feed.
Besides, die seed-cakes contain six minerals (N, P, K, Na, Ca and F:e), where percentages
ol N, P and K have been found lobe 5.5%, 2.8%, and 1.4% compared to those in ground nut
(7.1%, 1.3%, and 1,2%) and cotton seed (3.8, 1.1% and 1.4%). It has also been estimated that if
proper initiatives are taken, at least Tk. 49.32 crore could be earned per annum from toe seed
oil of the existing 37,64b ha plantations of the country. The seed oil and the deroiled seed-cakes
will not only create emptormerit opportunity and ffow of eionumic activities, but will also save
substantial amount of foreign exchange from importing other edible oils and the essential
ingredten Is o f anima I feed.

Abstract:

The composition and diversity of native tree species of Moulvibazar natural forests of
Sylhet Forest Division were investigated. A total of 1,051 individual stems having dbh of & 5cm
were recorded from 1.44 ha sampled area. These comprise 81 native bee species belonging to
59 genera under 33 families. Moraceae and Euphorbiaceae dominated in the Study area
containing 9 and 8 species respectively followed by Rubiaceae (7), Myrtaceae and Vefbenaceae
(6 species each). Average species diversity was 3.4L) and ranged from 3.21-3.61 in the studyarea. Species similarity index was highest (69.72%) between Lawachara and Adampur followed
by Adampur and Gubindapur (65-4%) and lowest (62.7″i>) between Lawachata and Gi’bindpur.
Tree density was found 573 stems ha’1 in Lawachara, 860 stem ha J in Adampur (Kalengi) and
756 stems ha”1 in Gobindapur. Artoccrptts eftawa showed the highest (32,63 m2) basal area rn
Lawadiara followed by Liigerstrarraiir ptiroi/tara (6.98 tn2) and Cliiikrirsir wfiittW (5.74 m2), but in
Adampur maximum basal area showed by fyzygitiNrJinwiV (2.39 in2) followed by Artorpirs
c/jfijrju (2,04 m2), CasfaiJcpsrs tribidordea (1.24 m2), while in Gobindapur, meximam basal area
recorded for ftotrnirpre; vnnnwit (1.31m2) followed by Atia.’fltpits dtaitm (1.(34 m2) and l/tiex
ptfesrrns (0.82 m2). Highest Importance Value Index (TV!) in Lawadiara natural forests was
86.92 for Arhymprrx ttaw followed by I ngeralnriuin ptinriflwa (29.53), Chukraiia ivlutina fl5-11},
but in Adampur Sy^iunj firmum attains the highest IVI (39.92) followed by Casfimppsts
fribdoitfcs (17.62), Artomrpns dmjjir (17.46), Lagerstroemia pantiflom (15.62) and Efa’ocnrpws
rrjrjrjjir (15.41), while, in Gobirtdapur, the highest IVI was recorded for FforciTtfpjis uantmtf
(22.32) followed by Vita pubescetts (15.06) and Si/zygititti[omasum (14,71

Abstract:

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

Abstract:

An experiment was conducted to find out the strength properties and dimmsfonal
stability of particleboard using waste wood and planer shavings Collected from Bangladesh
Forest Industries Development Corporaholt (Bl-1 DC). Waste WOod were converted in in chips.
Particleboards were fabricated at fhe different ratios of wood chips and planer shaving such as
100:0, 75:25, 50:50, 25:75, and 0:100, Results show (hat particleboards made from 100% planer
shavings have good static bending properties : 143 kg/cm2) and excellent tensile strength
(13 kg/cuv). Both the values satisfy the Indian and British standard. Tilt1 percentage of
thickness swelling and water absorption were measured a tier 2 and 24 hours soaking in water,
lowest thickness swelling and water absorption were found in the board made of 100% planer
shavings. Particleboa ids made from 75% and 50% planer shavings also satisfy the Indian
standard. It is concluded that planer shavings from different wood based industries can he
used for making conventional partiilebuard of high strength properties.

Abstract:

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

Abstract:

the aim nf the study was to estimate carbon Stockof 18-year old three plantations species
iiamelv Acacia aurietdifonuis Gunn., A&tiidrepfta/ifs c/itnrnsrs Lamk. and Tt’ctonrr ^rmjdrs L.
Systematic sampling method was used to identify each sampling point through the Global
Positioning System (GPS), I ree biomass estimated by Loss on Ignition method and soil carbon
slock was dertemuned by Walklev-Black oxidation method. Results showed that the total
carbon stock was highest 211.119 ton-ha 1 in AcnriitaiirinrhjfcYwis plantation. The maximum litter
carbon was 2.46 ton-ha^ in TtYtoJia jjrandis plantation followed by 1.89 toji-ha-t in Arrttao-ptaMs
rlrijjensis. Selection of plantation tree species according to highest carbon slock capacity may
help the developing countries to earn more carbon err’dits, and in the long rim, to tackle the
climate change.

Abstract:

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 jhiim is the new documentation of
indigenous knowledge. An integration of indigenous and scientific knowledge will
help to develop sustainable management of indigenous farming practices.

Abstract:

Aire indica L is an important commercial medicinal phnf and cominerciai.lv cultivated in
the Northern part of Bangladesh, in 2004, a severe leaf spot disease was found in the four
months’ old plantations of Aire iiidim. The svmptom of tile disease was recorded and the causal
organisms were identified. Four types of fungi namely Cflt/iMwiHS Itmdbts Nelson jfc Haasis,
PenirrifiJUH sp., Aspergillus sp. and Firsurinffi &p, were isolated from the infected leaves of A.
Onlv C. iunalus fungus was isolated from the healthy leaves. Out of these, C. hrnjtfus was
frequently found io be? responsible for the disease. Tie pathogenicity test was conducted, and
the association of the fungus with the disease was confirmed. Ihree types of fungicides
Sunvit, Dithane M- 45 and Aimcozim each ” 2gm/l water was applied against the disease.
Pithane M-45 gave the best result among three fungieidcs

Abstract:

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.

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