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hemicrytophytes were recorded higher as AHAMED, K.U. (BARI, Gazipur). Effect of
compared to other classes during all the seasons. In different dates of planting on the growth, yeild and
summer and rainy seasons hemicryptophyte alone yeild contributing characters of Banana at Ishurdi
was with the highest number of species. region. Bang. J. Life Sci., 2008, 20 (2), 101-109.
582 : BOTANY : PLANT TAXONOMY An investigation was conducted to find out the
effect of suitable planting date on growth and yield
131 ABDULLAH, S.; SULTANA, N.; of Banana cv. sabri during 2005-2006. Six dates of
th
th
th
planting, viz., 15 September, 15 October, 15
HOSSAIN, M. (Dept. of Horticulture, November, 15 February, 15 March and 15
th
th
th
Bangabandhu Sheikh Mujibur Rahman April were used. The tallest pseudostem of Banana
Agricultural University, Gazipur); SAHA, S.R. (311.20cm) was obtained from 15 November
th
(Horticulture Research Centre, Bangladesh planting and the shortest pseudostem (299.60cm)
Agricultural Research Institute, Gazipur) & was from 15th April planting. The maximum crop
ISLAM, A.K. M.A. (Dept. of Genetics and Plant duration (495.30 days) was recorded from 15
th
Breeding, Bangabandhu Sheikh Mujibur Rahman April planting, while it was minimum (386.66
Agricultural University, Gazipur). Morphological days) from 15 September planting.Significantly
th
variation in thirteen sweet pepper (Capsicum the highest bunch weight (17.96 kg) and number of
annuum L.) genotypes. Bang, J, Life Sci,, 2007, 19 fingers per bunch (92.83) were obtained from 15th
(1), 95-100. October plantings which resulted the highest yield
(44.90t/ha). Single fruit weight (191.9g), weight of
Morphological characters among thirteen sweet flesh (138.40g) and total soluble solid (27.46%)
pepper genotypes were studied. Wide variations were found highest from 15 October planting.
th
were observed among the genotypes.The stem
pubescence was found glabrous in seven genotypes 133 BASHAR, M.A.; BELAL, S.I.;
and intermediate in four genotypes. Five genotypes CHOWDHURY, S.F.N. (Dept. of Zoology,
were found to have glabrous leaf pubescence. Dhaka University, Dhaka); ASLAM, A.F.M.
Some of the genotypes had the calyx with dentate, (Dept. of Zoology, Jahangirnagar University,
intermediate and smooth calyx margin.Three Savar, Dhaka) & CHOWDHURY, A.K.M.
categories of fruit length were found among the (National University, Gazipur). SEASONAL
genotypes under study. Fruit color at the immature ABUNDANCE OF A PYRALID PAST
stage was found green and deep green. Nine AFFECTING DUCKWEED PRODUCTIVITY IN
genotypes had the red color fruits turned at the POND ECOSYSTEM. Bang, J, Zool,, 2007, 35
mature stage and others were yellow to red. Three (1), 39-47.
categories of fruit shape were found among the
accessions under study i.e. elongate, conical and Severe infestation caused by a pyralid insect pest
bell shaped. There were four kinds of fruit shape at on duckweeds was recorded from July 2004 to
peduncle attachment i.e. obtuse, truncate, lobate February 2005 in some duckweed farms of
and cordate.Two categories of fruit shape at Bangladesh. The larval and pupal case-making
blossom end were reported and they were pointed stages were identified as mechanical key factors
and sunken. Four genotypes had the fruit cross for bringing the pyralid insect to its pest status.In
sectional corrugation which was 'slightly Mirzapur station-1. larval abundance was in the
corrugated and rest of the genotypes produced peak in September and October. Larval abundance
fruits of 'intermediate' corrugation.Eight genotypes was diminished to zero state in January. Maximum
had the purple node color and rest of the genotypes number of pupa was recorded in September 2005.
had the green node color. The pest population was virtually absent in
December and January. Larval abundance in
132 ARA, N. (Regional Agricultural Research Mirzapur station reached to its peak in September
Station, BARI, Ishurdi, Pabna); KABIR, W. anti came to zero during the second half of
(BARC, Dhaka), KAISAR, M.O. & December. The absence of larval case was found to
continue up to the second half of January. The
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