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varieties of mustard such as Daulat, Rai-5, IBA and 1AA. Within four weeks of transfer to the
Improved tory-7, and Ishurdi local with four rooting medium, 90% of the microcuttings
sowing dates viz. 15 Nov, 23 Nov, 30 Nov. and 7 produced four to five healthy roots. The
Dec. were used for the experiment. The experiment regenerated plantlets were successfully transferred
was laid out in a split plot design with sowing date to potted soil. About 90% of plantlets were
in the main plot and varieties in the sub plot. The survived under ex vitro conditions.
results revealed that the variety Daulat (1035
kg/ha) and Ishurdi local (1014 kg/ha) produced 431 SAMAD, M.A.; HUSAIN, M.; BEGUM,
identically superior yield irrespective of sowing M. & HOSSAIN, M.A. (Entomology Division,
time. 15 November (1164 kg/ha) and 23 November Bangladesh Institute of Nuclear Agriculture
(1002 kg/ha) recorded identically superior yield (BINA), Mymensingh). Effects of Sowing dates on
irrespect of variety. Daulat and Ishurdi local The Incidence of Mustard Sawflies, Mustard
variety sowing could be delayed up to 30 Aphids and its Predator, The Lady Bird Beetles.
November to obtain a profitable yield of (872 kg./ Bang. J. Zool., 2007, 35 (2), 319-324.
ha) and (940 kg/ha) respectively which was still
economically profitable. A research work was conducted at the BINA Farm,
Mymensingh during the period from October 2005
430 ROY, P.K. (Institute of Food and Radiation to March 2006 to determine the influence of
Biology, Atomic Energy Research Establishment, sowing dates on the incidence of sawflies, aphids
Dhaka). In vitro clonal propagation of camphor and their predator the lady bird beetles and the
plant, Cinnamomum camphora L. through shoot tip damage caused by the pests on mustard plants. The
and nodal explants culture. Bang. J. Life Sci., 2007, mustard seeds were sown in the field at different
19 (1), 121-127. sowing dates at an interval of 10 days. The first
and last sowing were done on 31 October and 3
An efficient plant regeneration system has been December, respectively. The plants sown on 3
achieved in Cinnamomum camphora L. using December, had the lowest percentage of sawfly
shoot tip and nodal segment explants from 10- infestations. The plant sown on 31 October had the
year-old field grown plant. Different lowest number of aphids per plant and the lowest
concentrations and combinations of BAP, Kn, percentage of aphids infested plants. The incidence
Zeatin and NAA were used for multiple shoot of aphids increased with the advancement of time
regeneration. Among two types of explants, nodal but it was opposite in case of sawfly infestation.
segment explants produced the highest number of The population of the lady bird beetle was related
shoots (22±0.2) when they were cultured on WPM to the population of aphids in the field. The last
+ 3.0 mg/l BAP + 1.0 mg/l Kn. With the number of sowing caused the highest aphid infestations and
subculture and addition of 125 mg/l CH to the the highest number of aphids per plant. The crops
culture medium increased the number of shoots of the 2nd sowing produced the highest yield. The
(28) per culture. Shoot tip explants also produced aphid population was influenced, by the sowing
multiple shoots, but their performance was not date and weather factors, namely temperature,
good as nodal explants. For best rooting, well relative humidity and sunshine hours.
developed shoots were excised and implanted
individually onto the rooting medium containing 432 SARKER, P.K.; RAHMAN, M.M. &
half-strength MS fortified with 0.5 mg/l each of DAS, B.C. (Dept. of Zoology, Rajshahi University,
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