Productivity and resistance of okra ( Abelmoschus spp.) to the cotton aphid Aphis gossypii glover (Hemiptera: Aphididae) under tropical conditions uri icon

abstract

  • Aphis gossypiiGlover (Hemiptera: Aphididae) is among major arthropods causing significant damage to okra in the tropics. Resistant varieties could reduce aphid infestation and increase productivity. This study was carried out to identify aphid-resistant and high yielding okra accessions for management of the pest. Eleven farmers' varieties and four aphid-resistant accessions from AVRDC were evaluated at its Nkolbisson station in Yaounde, Cameroon. Field screening was done to determine resistance to aphids, days to 50% anthesis and days to 50% commercial maturity. Aphid data was expressed as the area under infestation pressure curve and subjected to statistical analysis based on mean (m) and standard deviation (S.D.). Crop cycle and yield data were subjected to analysis of variance. Accession 'VI033824' was the most resistant to aphids (474 +/- 41.9 per leaf) with yield 0.76 +/- 0.26 t/ ha whereas the yield of the highly susceptible Babungo (1519.8 +/- 0.0 aphids) was 1.33 +/- 0.07 t/ha, 75.5% higher that the yield of the only resistant variety.Abelmoschus esculatuswas less attacked (601.4 +/- 60.0 aphids) by aphids thanAbelmoschus caillei(826.0 +/- 71.6 aphids; df = 1, 41; Pr {>Chi} = 0.037). The yield ofA. cailleispecies were higher (1.26 +/- 0.14 t/ha) thanA. esculentusspecies (0.43 +/- 0.08 t/ha; df = 1, 41; Pr {>Chi} = 0.0002). Hence, varieties with resistance, tolerance to aphids and earliness could be incorporated into integrated pest management of aphids and enhance productivity of okra.

publication date

  • 2020
  • 2020