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Major Insect Pests of Yard Long Bean (vigna Sesquipedalis) and Their Management

NAZNIN AKTAR
MS. Student, Reg. No. 04-01427
Department of Entomology, Sher-e-Bangla Agricultural University, Dhaka

Abstract/ Executive Summary:

The study was conducted for major insect pests of yard long bean (Vignasesquipedalis) and their management. Data on the number of pests per plant, number and weight of healthy pod, infested pod and percentage of pod infestation in number and weight, yield contributing characters and yield of yard long bean were recorded and statistically significant differences were calculated for different treatments. Incidence of major insect pests of yard long bean was recorded for the entire cropping season and pod borer, aphid and epilachna beetle were observed. At early, mid and late pod stage, the lowest % pod infestation (in number) (1.77%, 2.78% and 3.30%) was observed from T5 treatment, while the highest infestation (8.93%, 12.28% and 17.12%) was recorded in T8 treatment. Similar results/trends were found for pod infestation in weight basis. The highest yield per hectare was recorded from T5 (26.87 ton), while the lowest yield was recorded from T8 (12.20 ton).

Keywords: Majorinsect pests, Yard long bean, Management

Location: Sher-e-Bangla Agricultural University, Sher-e-Bangla nargar, Dhaka

Start Date: 00-04-2011

End Date: 00-08-2011

Program Area: Pest Management

Commodity: Yard long bean

Objectives:

1. To identify the major insect pests of yard long bean.

2. To determine the effectiveness of different control methods against the insect pests of yard long bean.

3. To identify the most effective control measures against the insect pests of yard long bean.

Methodology:

The study was conducted at the Sher-e-Bangla Agricultural University, Sher-e-Bangla nargar, Dhaka, during from April to August 2011 for major insect pests of yard long bean (Vignasesquipedalis) and their management. Required materials and methodology are described below under the following sub-headings:

Location

The study was carried out in the field of Sher-e-Bangla Agricultural University farm, Sher-e-Bangla Nagor, Dhaka, Bangladesh.

Collection of seed, seedling raising and transplanting

The seeds of BARI long yard bean-1 were collected for rapid and uniform germination the seeds of yard long bean were soaked for 12 hours in water. Seeds were then directly sown in the 28th April, 2011 in polyethylene bags (12 cm × 18 cm ). Seeds were sown in bags and irrigated regularly. Water was sprayed once a day for one week. Seedlings were placed in a shady place and were transplanted on May 13, 2011 in the pits of the experimental field after 15 days of germination.

Experimental layout and design

The experiment was laid out in Randomized Complete Block Design (RCBD) with three replications..

Treatments:

The experiment consists of the following management practices:

T_1: Shobicorn 425EC @ 2 ml/L of water at 10 days interval

T_2: Ripcord 10EC @ 1 ml/L of water at 10 days interval

T₃: Actara 25WG @ 0.5 g/L of water at 10 days interval

T_4: Diazinon 60EC @ 3 ml/L of water at 10 days interval

T₅: Suntap 50WP @ 3 g/L of water at 10 days interval

T_6: Quinalphos 25EC @ 3 ml/L of water at 10 days interval

T₇: Neem seed kernel powder @ 10 g/L of water at 10 days interval

T₈: Untreated control

Monitoring and data collection

The following data were collected during the course of the experiment.

• Incidence of insect pests

• Number of healthy fruits

• Number of infested fruit

• Fruit infestation in number (%)

• Weight of healthy fruits

• Weight of infested fruit

• Fruit infestation in weight (%)

• Edible part of fruit (%)

• Non-edible part of fruit (%)

• Number of pods per plant

• Number of seeds per pod

• Pod length (cm)

• Pod diameter (mm)

• Yield per plot (kg)

• Yield per hectare (ton)

Statistical analysis

The data obtained for different characters were statistically analyzed to find out the significance of the difference among the treatments.

Source of Information: M.S. Thesis, 2011, Department of Entomology, Sher-e-Bangla Agricultural University, Dhaka

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The number of pests per plant, number and weight of healthy pod, infested pod and percentage of pod infestation in number and weight, yield contributing characters and yield of yard long bean were recorded and statistically significant differences were calculated for different treatments. Incidence of major insect pests of yard long bean was recorded for the entire cropping season and pod borer, aphid and epilachna beetle were observed. At early, mid and late pod stage, the lowest % pod infestation (in number) (1.77%, 2.78% and 3.30%) was observed from T5 treatment, while the highest infestation (8.93%, 12.28% and 17.12%) was recorded in T8 treatment. Similar results/trends were found for pod infestation in weight basis. The highest yield per hectare was recorded from T₅ (26.87 ton), while the lowest yield was recorded from T₈ (12.20 ton).

Knowledge Management: Thesis