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.
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
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
The community structure and growing stock variations were studied in moist
temperate Quercusfloribunda forest on four different aspects and altitudesin Garhwal
Himalaya during the year 1996. The total density and basal cover values in the tree
layer varied from 250 to 340 trees/ha and 18.44 to 38.24 m2/ha respectively. The
maximum number ofsaplings (400 saps/ha) of Quercusfloribunda were observed on
the hill base of SE aspect, whereas, the lowest number ofsaplings (80 saps,/ha) on the
hill top of NW aspect. The maximum (1.8131) and minimum (1.4717) diversity values
were reported for NE and SE aspects respectively. The highest total growing stock
(349.0m3/ha) was observed on SW aspect. On NE aspect a strong positive correlation
(r=+0.88) was observed between the growing stock values and diameter classes.
Physicochemical properties of soils were found to be promising for the growth of
Quercusfloribunda forest on northern aspects as compared to southern aspects.
This paper describes the community structure of two prominant forest types i.e.,
moist deciduous miscellaneous and riverian Khair-Sissu forests of Himalayan foot
hills in relation to their analytic and synthetic characters. The importance value index
(IVI) values recorded from moist deciduous miscellaneous forest were maximum for
Mai lotus philippinensis (113.28) and minimum for Cassia fistula (6.54). Similarly the IVI
values in the riverian Khair-Sissu forest were maximum (218.02) for Dalbergia sissoo
and minimum (16.46) for Sapium insigne. The species diversity (2.3796), beta diversity
(2.9166) and equitability (14.6700) values were observed as maximum in moist
deciduous miscellaneous forest, whereas the values for these parameters were minimum
(0.8507, 1.3636 and 2.4915 respectively) in the riverian Khair-Sissu forest.
However, the values for concentration of dominance was maximum (0.6827) in
riverian Khair-Sissu forest and minimum (0.1071) in moist deciduous miscellaneous
forest. The soils in both the forest types were observed as alluvial, coarse textured and
almost neutral in reaction.
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