Abstract:
The study on host plant preference of aphid and predation efficacy of ladybird beetles
on aphid was conducted at Sher-e-Bangla Agricultural University central farm and the
laboratory of the Department of Entomology, SAU during November 2020 to April
2021. Two experiments were conducted to explore the host plant preference of aphid
and the predator efficiency of ladybird beetle. They were laid out in Randomized
Complete Block Design (RCBD) for field condition and Complete Randomized Design
(CRD) for laboratory condition with 3 replications. There are six different crops as
treatment-wheat, brinjal, tomato, potato, country bean and mustard. The highest number
of aphid (54.51 plant
-1
) was recorded in Country bean at 7 DAS and the lowest (8.00
plant
-1
) number of aphid was recorded in Brinjal plant at 35 DAS. The highest number
of aphid (29.67 leaf
-1
) was recorded in Country bean at 35 DAS and the lowest (8.00
leaf
-1
) number of aphid was recorded in Wheat plant at 14 DAS. The highest number of
aphid (9.67 inflorescence
-1
) was recorded in Country bean at 14 DAS and the lowest
(3.00 inflorescence
-1
) number of aphid was recorded in Wheat plant at 14 DAS. The
highest number of aphid (15.67 twig
-1
) was recorded in Country bean at 7 DAS and the
lowest (11.00 plant
-1
) number of aphids was recorded in Brinjal plant at 35 DAS. The
highest number of aphid (6.00 pod
-1
) was recorded in Country bean and the lowest (5.94
pod
-1
) number of aphids was recorded in Brinjal plant. The highest consumption of
aphid (3.10 aphid) by Ladybird beetle was recorded in Country bean at 12 hours interval
and the lowest consumption of aphid (1.10 aphid) by Ladybird beetle was recorded in
Wheat at 6 hours interval. The adult ladybird beetles was more efficient in predating
aphid and the highest consumption of aphid was recorded from adult ladybird beetles.
Description:
A Thesis
Submitted to Department of Entomology,
Faculty of Agriculture.
Sher-e-Bangla Agricultural University,
Dhaka-
In partial fulfillment of the requirements for the degree of
MASTERS OF SCIENCE (MS)
IN
ENTOMOLOGY
