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Incidence of Major Insect Pests of Blackgram at Different Dates of Sowing

M. Z. H. PRODHAN
Senior Scientific Officer
Regional Agricultural Research Station, Bangladesh Agricultural Research Institute, Ishurdi, Pabna

M. A. HOSSAIN
Scientific Officer
Regional Agricultural Research Station, Bangladesh Agricultural Research Institute, Ishurdi, Pabna

M. T. RAHMAN
Principal Scientific Officer
Regional Agricultural Research Station, Bangladesh Agricultural Research Institute, Ishurdi, Pabna

F. AFROZE
Scientific Officer
Regional Agricultural Research Station, Bangladesh Agricultural Research Institute, Ishurdi, Pabna

M. A. SARKER
Scientific Officer
Entomology Division, Bangladesh Agricultural Research Institute, Joydebpur, Gazipur, Bangladesh

Abstract/ Executive Summary:

Incidence of major insect pests of blackgram at different dates of sowing was studied at Regional Agricultural Research Station, Bangladesh Agricultural Research Institute, Ishurdi, Pabna with six sowing dates initiating from August 07 to September 11, 2007 at an interval of seven days. Hundred percent of the sampled plant was found to be infested by stem fly and flea beetle while their intensity of infestation varied significantly. The lowest stem tunneling per plant by stemfly, damaged leaf by flea beetle and pod borer infestation was observed in Aug 7 sowing followed by Aug 14 and 21. The maximum number of thrips was found in early plantings (up to 21 Aug) whereas minimum in late plantings. The study indicates that early planting (up to 21 August), in general, gave lower infestation by the insects than late plantings. Significantly the highest yield was obtained from Aug 7 followed by Aug 14 and Aug 21, while Sept 11 and Sept 04 had the lowest yield.

Keywords: Insect pests, dates of sowing, blackgram, yield

Location: The field of Regional Agricultural Research Station, Bangladesh Agricultural Research Institute (BARI), Ishurdi, Pabna, Bangladesh

Start Date: 00-08-2007

End Date: 00-09-2007

Program Area: Pest Management

Commodity: Black gram

Objectives:

To observe Incidence of major insect pests of blackgram at different dates of sowing.

Methodology:

The experiment was conducted in the field of Regional Agricultural Research Station, Bangladesh Agricultural Research Institute (BARI), Ishurdi, Pabna, Bangladesh during August to September 2007. Seeds of blackgram (variety BARImash-3) were sown on 6 different dates from August 7 to September 11, 2007 at an interval of seven days (August 7, 14, 21, 28, September 4 and 11). Each sowing date was considered as individual treatment. The experiment was laid out in randomized complete block design with four replications having plot size 3.0 × 3.0 m with an inter plot distance of 0.75 m and inter block distance of 1.0 m. Spacing of row to row and seed to seed was 30 cm and 10 cm, respectively. Soil was fertilized with Urea, Triple supper phosphate and Muriate of potash at the rate of 45, 100 and 58 kg/ha, respectively (Razzaque et al. 2000). All the fertilizers were incorporated in the soil during final land preparation. For stem fly infestation, ten randomly selected plants were uprooted from each plot and brought in the laboratory. Roots were cleaned to remove adhering soil, stems of each plant were dissected with a scalpel and observations of length of stem, length of tunnel and the number of larvae and pupae present in the stem were recorded. The number of stem fly infested plants in each sample was also recorded. In case of flea beetle, ten randomly selected plants were carefully examined at 45 days after sowing. The number of flea beetle damaged plants and percentage of damaged leaf per plant was also recorded. In case of thrips, twenty flowers were carefully examined from each plot. The number of thrips was recorded. Regarding pod borer infestation, at harvest, 10 randomly selected plants from each plot were carefully uprooted to record the number of infested and healthy pod. The number of pod borer damaged plants was also recorded. The yield per plot was recorded and converted into yield per hectare. Data were analyzed statistically and the treatment means were separated by Duncan’s Multiple Range Test (DMRT).

Source of Information: Int. J. Sustain. Crop Prod. 3(3):6-9, 2008

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Considering the damage severity of major insect pest and yield of black gram it may be suggested that higher yield can be obtained through escaping insect infestation if blac kgram is sown between Aug 7 and Aug 21.

Knowledge Management: Journal