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Survey and Monitoring of Bph and Its Natural Enemies in Sirajgonj (afaci Project)

Dr. Mohammad Fazle Rabbi
CSO and Head
Entomology Division, BRRI, Gazipur-1701

Md. Mofazzel Hossain
SSO
Entomology Division, BRRI, Gazipur-1701

Abstract/ Executive Summary:

Small brown planthopper (SBPH) recently recorded in Bangladesh in yellow sticky trap. In all the locations BPH population surpassed the ETL level during the second week of April but the WBPH population reached the ETL level earlier than the BPH in the fourth week of March in all the locations except Dobila. At Dobila increased population of WBPH was found in the first week of April. The population of spider started to increase from the first week of March. The LBB and STB population increased with the increase of their preys (BPH, WBPH). Small brown planthopper (SBPH) was not been found in any light trap but it was recorded in sticky trap with BPH and WBPH. The population of STPB was higher in the light trap than the other natural enemies. The beetle showed a higher incidence during March and the population declined in the following months in all the locations.

Keywords: Rice, BPH, SBPH, Natural enimies

Location: Tarash Upazilla, Sirajgonj

Start Date: 01-07-2011

End Date: 30-06-.2012

Program Area: Pest Management

Commodity: Rice

Objectives:

To study the BPH and its natural enemy incidence patterns in rice at Tarash in Sirajgonj

Methodology:

To monitor the population density, abundance and incidence period of BPH and their natural enemies in the project areas, yellow sticky trap and light trap were used. Plant hoppers were monitored by yellow sticky traps (15.24 x 25.4 cm) in two control plots of each location. A weekly monitoring in each plot consisted of three replications of sampling. In each replication trapping was done at 10 spots of the field randomly selected diagonally or vertically. At each trapping spot, sticky trap was hold flatly between two plants at the base and the plants were tapped three times to capture insects. The trapped insects on yellow traps were counted and recorded. Pensylvannian light traps were installed in three locations (Dobila, Hamkuria and Ghargram) of the project area. The traps were operated dusk to dawn and the insect pests and natural enemies caught in the traps were collected, sorted, counted and the numbers recorded in the data sheet every day.

Source of Information: Internal review workshop, 2011-12

Article Link (Online Journal):

Funding Source:

1.

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Rice planthopper incidence was peak in yellow sticky trap catches during crop harvest. Initially, the BPH, WBPH and SBPH caught in the yellow sticky trap were very low in field catches but it increased from booting to harvesting stage of the rice crop. The rice fields in Ghargram were infested more than the other two locations (Dobila and Hamkuria). Small brown planthopper (SBPH) was not reported earlier in Bangladesh but recently it was trapped in yellow sticky trap during field monitoring. In all the locations BPH population surpassed the ETL level during the second week of April (heading – flowering stage). But the WBPH population reached the ETL level earlier than the BPH in the fourth week of March (Panicle initiation – booting/heading stage) in all the locations except Dobila. At Dobila WBPH with increased population was found in the first week of April (flowering stage). Among the natural enemies, spider population was higher than the others in all the locations. The population of spider started to increase from the first week of March. The LBB and STB population followed a similar trend to that of their preys (BPH, WBPH) i.e. their population increased with the increase of prey population. Light Trap: Incidence pattern of BPH and WBPH in the light trap was different from that of the yellow sticky trap. Populations of both the insects were very low in all the locations. Small brown planthopper (SBPH) was not been found in any light trap but it was recorded in sticky trap with BPH and WBPH. However, SB population showed two small peaks- one in the first week of March and the other in the later part of April. The population of STPB was higher in the light trap than the other natural enemies. The beetle showed a higher incidence during March and the population declined in the following months in all the locations.

Knowledge Management: Report/Proceedings