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Validation of the Component Technologies for Bph Management in Sirajgonj

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

Sheikh Shamiul Haque
PSO
Entomology Division, BRRI, Gazipur-1701

Abstract/ Executive Summary:

In Sirajgonj (a BPH prone area) BPH and WBPH surpassed the ETL in the Boro season. Small brown planthopper was not reported earlier in Bangladesh but has been recorded in the yellow sticky trap in this area. Chemical application by double nozzle sprayer has been found more effective than single nozzle sprayer in controlling BPH. Spraying chemical by double nozzle sprayer remained BPH infestation below the ETL level and produce more yield. In an outbreak situation chemical control is essential to avoid ‘hopper burn’ of rice.

Keywords: Rice, Validation, BPH, Technology, IPM

Location: Tarash, Sirajgonj

Start Date: 01-07-2011

End Date: 30-06-.2012

Program Area: Pest Management

Commodity: Rice

Objectives:

To select a suitable package of management technologies for BPH control in HYV Boro rice and to popularize adoption of improved management practices among the participating farmers for controlling BPH in rice.

Methodology:

The experiment was conducted in farmers fields to validate the component technologies developed so far at BRRI at BPH prone area. The treatments were as follows: i) Spacing (20 X 20 cm) ii) Integrated management iii) Use of single nozzle sprayer iv) Use of double nozzle sprayer v) Control (no measure) Forty farmers having large rice fields (approximately 0.14 ha) were selected in the project area. Fields were selected in such a way that the selected fields remain scattered throughout the entire rice growing area of the project site. Each of the field /plot was divided into two equal halves. One portion of the field remained under the respective farmer's supervision without any intervention. The remaining portion was managed under a single component technology . The variety BRRI dhan29 was transplanted in all the plots. Each component was assigned to eight farmers fields. Incidence of BPH was recorded by collecting data from 20 randomly selected hills along the diagonal of each field at 10 days interval. The yield was estimated from 20m² harvest area from each plot and analyzed statistically. In addition, yield components were also studied by sampling 2 hill x 2 hills from 3 randomly selected sites of each field. The experiment was laid out in a RCB factorial design. In integrated management a total of 10 straw tapes were placed for spider conservation. In addition, duck-weed was introduced in the plot for conservation of green mirid bug- a voracious predator of BPH and WBPH. Only one application of insecticide was made in each of single nozzle and double nozzle treatment plots.

Source of Information: Internal review workshop, 2011-12

Article Link (Online Journal):

Funding Source:

1. Krishi Gobeshona Foundation	Budget:
2. Bangladesh Agricultural Research Council	Budget:

Total Budget (Tk.) :

Achievement/Findings:

The abundance of BPH and WBPH from 20 randomly selected hills at 10 days interval in different treatments showed that population of both the hoppers was very low until the last week of April. The population became higher only on 28 April both in research and farmers managed fields. In all the treatments population of BPH and WBPH were significantly lower than that of the control. There was no significant difference in BPH and WBPH population among the treatments upto 28 April. But at harvest the population of the hoppers crossed economic injury level in all the treatments and control plots except the plot having sprayed by double nozzle sprayers. Accordingly, significantly higher yield was obtained in double nozzle sprayer operated plot. This was probably due to a better coverage of insecticide application by double nozzle sprayer which controlled planthoppers efficiently. There was also a significant difference in yield between single and double nozzle sprayer use. Integrated management plot yielded slightly lower than the other treatments. Irrigation water in integrated management plot was drained out time to time to suppress the planthopper population which might have affected the yield in this treatment. Interaction effect of different treatments and yield with farmers and research managed field also gave similar results as above. However research managed field had slightly higher yield (2.12%) than the farmers managed field. Insecticide and other management practices applied in appropriate time and with a right dose in the research managed field might be responsible for the higher yield than the farmers managed field.

Knowledge Management: Report/Proceedings