Abstract:
The effect of sowing times on incidence and damage severity of mungbean thrips
was studied during the period from January to June 2015 at the experimental field
of Sher-e-Bangla Agricultural University (SAU). The experiment comprised of
seven treatments viz., T1= sowing on 31 January 2015, T2= sowing on 10 February
2015, T3= sowing on 20 February 2015, T4= sowing on 2 March 2015, T5= sowing
on 12 March 2015, T6= sowing on 22 March 2015 and T7 = sowing on 1 April
2015. The variety, BARI mungbean 6 was used as planting material. The
experiment was laid out in Randomized Complete Block Design (RCBD) with
three replications. Data on different crop parameters, incidence and infestation of
mungbean thrips, flower shedding were recorded and analyzed statistically.
Different sowing dates had significant effect on growth and yield parameters,
incidence of thrips and flower shedding of mungbean crop. It was found that the
highest number of healthy plants (61.33), number of flowers plant-1 (12.22),
number of total pods plant-1 (12.00), number of seeds pod-1 (11.33) and weight of
seeds plant-1 (16.83 g) was obtained from T6 (sowing on 22 March 2015). Again,
the lowest number of mungbean thrips flower-1 (1.00, 2.00, 2.20, 2.50, 3.00,1.50,
2.00 and 1.20 at 25, 30, 35, 40, 45, 50, 55 and 60 DAS, respectively), infested
plants (18.67), infested flower plant-1 (2.20) and flower shedding plant-1 (3.0) was
recorded form the same treatment T6 (sowing on 22 March) followed by T7
(sowing on 1 April). Considering thrips infestation and flower shedding 22 March
was the best time for sowing mungbean.
Description:
A Thesis
Submitted to the Faculty of Agriculture
Sher-e-Bangla Agricultural University, Dhaka,
in partial fulfillment of the requirements
for the degree of
MASTER OF SCIENCE
IN
ENTOMOLOGY
SEMESTER: JANUARY- JUNE, 2015
