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Relative Abundance and Yield Loss Assessment of Lentil Aphid, Aphis Craccivora Koch in Relation to Different Sowing Dates

MD. ALTAF HOSSAIN
Department of Entomology, Regional Agricultural Research Station, BARI, Ishurdi, Pabna, Bangladesh

JANNATUL FERDOUS
Department of Zoology, Ishurdi Women’s Degree College, Ishurdi, Pabna, Bangladesh

M. M. R. SALIM
Department of Horticulture, Regional Agricultural Research Station, BARI, Ishurdi, Pabna, Bangladesh

Abstract/ Executive Summary:

Relative abundance of lentil aphid, Aphis craccivora Koch were investigated and yield loss assessment at different sowing dates during rabi season of 1999-2000 and 2000-2001 at Ishurdi Bangladesh. Lentil aphid appeared in field in the first week of January. The maximum aphid population (15.82/twig) was recorded in the first week of February 2000-2001, but the population reached to the peak was in the last week of January in 1999-2000, subsequently rainfall caused a sudden reduction of aphid population in latter dates. Aphid population and infestation increased with the delayed dates of sowing. The crop sown in November received less aphid infestation and consequently produced higher yield than the crop sown in December. During 1999-2000, the avoidable yield loss due to aphid infestation was recorded 0.90 to 6.78% and in 2000-2001 it was 2.65 to 9.00% depending on the different dates of sowing. Avoidable yield loss was less in November sowing crop than the crop sown in December. On the other hand, yield increased by 0.91 to 7.27% and 2.72 to 9.89% in 1999-2000 and 2000-2001 respectively, due to protection measures taken against aphids and this was also depend on different dates of sowing.

Keywords: Lentil aphid, Delayed sowing, Infestation, Yield

Location: Pulses Research Center, Ishurdi, Pabna, Bangladesh

Start Date: 00-00-1999

End Date: 00-00-2001

Program Area: Crop-Soil-Water Management

Commodity: Lentil

Objectives:

To investigate aphid infestation, population fluctuation, severity of infestation and their effects on yield and yield loss in relation to dates of sowing.

Methodology:

The experiments were conducted at Pulses Research Center, Ishurdi, Pabna, Bangladesh during rabi season of 1999-2000 and 2000-2001. Four sowing dates were considered as treatments viz., November 21, November 28, December 05 and December 12. The experiments were laid out in randomized split block design with three replications. One split of the block was kept protected from aphid infestation by the application of Malathion @ 2 ml/litre of water. The lentil seeds of BARI masur 3 were sown on the above-mentioned dates in rows @ 50 kg/ha with a row spacing of 30 cm. The plot size was 3m x 2.5m. The plants were monitored regularly to detect the first appearance of aphids on lentil plants. At seven days interval, the infestation data were taken and the percentage of infestation determined. For calculating aphid population (number of aphids per infested twig) and the percentage of twig infestation, 30 twigs of 10 cm length were randomly collected from two side rows plant avoiding boarder rows of each plot from the untreated split of each block. The central four rows were kept undisturbed to record grain yield. At maturity, plants of central four rows of each plot of both the treated and untreated splits were harvested and grain yield was converted into per hectare. The yield data obtained from Malathion treated (protected) and untreated (unprotected) plots were used to calculate avoidable loss. The difference between the weight of grain yield in protected and unprotected plots was considered as loss. The percent loss was calculated from the following formula : Percent loss in yield due to pest= {(X1 – X2/X1)}. where, X1 is the mean yield of protected plots and X² is the mean yield of unprotected plots The experimental data were analyzed statistically after appropriate transformation and means were separated by Duncan’s Multiple Range Test (Steel and Torrie, 1960).

Source of Information: J Agric Rural Dev 4(1&2), 101-106, June 2006 ISSN 1810-1860

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The crop sown in November received less aphid infestation and consequently produced higher yield than the crop sown in December. During 1999-2000, the avoidable yield loss due to aphid infestation was recorded 0.90 to 6.78% and in 2000-2001 it was 2.65 to 9.00% depending on the different dates of sowing. Avoidable yield loss was less in November sowing crop than the crop sown in December. On the other hand, yield increased by 0.91 to 7.27% and 2.72 to 9.89% in 1999-2000 and 2000-2001 respectively, due to protection measures taken against aphids and this was also depend on different dates of sowing.

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