Abstract:
An experiment was conducted at the experimental farm of Sher-e-Hangla
Agricultural University Dhaka, during Feb-Aug 2007 to evaluate some chemicals
and botanicals against jassid. Arnrasca devastans on brinjal and their impact on
natural enemies. Nine treatments such as Admire 200S12, Ripcord IOEC, Marshal
20EC. Actara 24WG. Neern seed kernel, Neem oil -Trix, Trix, Mahua leaf extract
and untreated control plots were used in Randomized Completely H lock Design
(RCI3D) with 3 replications. The population of jassid adult gradually increased
with plant age irrespective of treatments. The lowest population of adult (2.36
before fruiting stage and 9.80 during fruiting stage) and nymph (0.73 before
fruiting stage and 1.67 during fruiting stage) per 5 lcaves/ plant was observed in
Marshal 20EC treated plot. The yield contributing characters such as. number of
leaves and branches/plant, number of fruits/plant, length, diameter and weight of
individual fruit were found the highest in Marshal 20EC @ 2 mI/I treatments. The
same treatment gave the highest yield (29.58 t/ha) and increased 44.65% yield
over control. The maximum net return (330071 Tk./ha) and the highest benefit
cost ratio (2.28) were also observed in Marshal 20EC. Admire 200Sl1 showed the
similar performance in all regards against jassid on brinjal. Ripcord IOEC also
gave the satisfactory results in reducing jassid infestation and increasing brinjal
yield. Among the botanieals tested, Neem oil f Trix and Neem seed kernel
showed satisfactory control of jassid on brinjal. Marshal 20FC. Admire 2005;L and
Ripeord IOEC reduced more than 80% population of spidcr and lady bird hecile.
Botanieals also decreased the population of spider and lady bird beetle over
control but their effect was moderate.
Description:
A Thesis
Submitted to the Department of Entomology
Sher-e-Barrgla Agricultural University, Dhaka,
in partial fulfilment of the requirements for the degree of
MASTER OF SCIENCE (M.S.)
IN
ENTOMOLOGY
SEMESTER: JULY- DECEMBER, 2007
