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Sereening of Some Soybean Entries for Resistance to Stem Flies (pohiomyia Phaseoli Tryon and Melanagromza Sizae Zehntner) and Thrir Incidence

Gobinda Chandra biswas
Scientific officer
ORC, BARI, Gazipur

Abstract/ Executive Summary:

Sixteen soybean entries were evaluated at Oilseed Research Centre, Bangladesh Agricultural Research (BARI) ,Gazipur, during 1996-97 and 1997-98 against stem flies infestation and their incidence, Among the 16 entries of soybean evaluated against stem flies infestation and their incidence only SK-1, 75-07-38-4 and MTD-459 were considered as resistance to stem flies (5-6.78% infestation and 9.93-15.29% stem tunneling) and higher yielder (1.30-1.48 t/ha). Seven entries (AGS-129, BS-10, Q-40, PM-78-63-13, 300-50-2-17 and Ransom) were considered as moderately resistance (10-14.66% infestation and 15-25% stem tunneling) and 5 entries (KSHB-2, CM -60, PR-164-120, 7521-26-1 and PK-416) were considered susceptible (15-22% infestation and 13-53% stem tunneling) to stem flies which produced lower yield (0.96-1.28 t/ha) than the other entries. The peak infestation (30-31.60%) of all the entries was observed in the last week of March, 1997 and 1998.

Keywords: Soybean, Stem flies, Resistance, Screening

Location: Gazipur

Start Date: 10-08-1997

End Date: 30-06-1998

Program Area: Pest Management

Commodity: Soybean

Objectives:

To evaluate the level of resistance to stem flies among the selected soybean lines and their incidence.

Methodology:

The experiment was conducted at the Oilseed Research Centre , Bangladesh Agricultural Research Institute (BARI), Gazipur during the Rabi seasons of 1996-97 and 1997-98. Sixteen soybean entries received from Thailand with one local cheek variety, Shohag (PB -1) were used in this study. The unit plot size 2m x 1.5m with a spacing of 30 x 5cm laid out in RCB design in three replication was used. Seeds of all soybean entries were sown on 25^th December each year in 1996 and 1997. Recommended agronomic practices were followed uniformly in raising the crop (Anon. 1998). Screening was done under natural infested condition. For evaluation of resistance to stem flies, 20 plants were randomly sampled per plot and then counted for infested and healthy plants in all the entries. Then the percent infested plants were calculated. This observation was made on 25 January (30 days after sowing =DAS) and continued up to 20 March ( maturity stage of the crop) at 10 days intervals. Recording the extent of stem of tunneling by the maggots and the total length of the 10 randomly selected infested stems of each replicated entries were done. The stem was split open with a find scalpel and the length of tunnel was measured with a scale . From these data percent of stem tunneled was calculated. Days to maturity and yield (t/ha) of all the soybean entries were also recorded. Statistical analysis of all replicated data was by calculating Analysis of variance, LSD (Least significant difference) and Co-efficient of variation (CV%) with the help of a computer following Gomez and Gomeze (1976)

Source of Information: Journal of Asiatic Society Bangladesh Science, 27 (1):93-100 2001

Article Link (Online Journal):

Funding Source:

1. Government

Budget: 10000/

Total Budget (Tk.) : 10000/

Achievement/Findings:

The stem flies infestation was observed in the 1^st week of January at early vegetative stage (30 DAS) and continued on the last week of March, in 1997 and 1998 at the maturity stage (80-90 DAS ) of the crop in both the years .The peak infestation (30-31.60%) of all the entries was observed in the last week of March. Among the 16 entries of soybean evaluated against stem flies infestation and their incidence only SK-1, 75-07-38-4 and MTD-459 were considered as resistance to stem flies (5-6.78% infestation and 9.93-15.29% stem tunneling) and higher yielder (1.30-1.48 t/ha). Seven entries namely, AGS-129, BS-10, Q-40, PM-78-63-13, 300-50-2-17 and Ransom were considered as moderately resistance (10-14.66% infestation and 15-25% stem tunneling) and 5 entries (KSHB-2, CM -60, PR-164-120, 7521-26-1 and PK-416) were considered susceptible (15-22% infestation and 13-53% stem tunneling) to stem flies which produced lower yield (0.96-1.28 t/ha) than the other entries.

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