Resistance in groundnut genotypes to Kalahasti malady caused by the stunt nematode, Tylenchorhynchus brevilineatus ∗ uri icon

abstract

  • A severe nematode disease of groundnut, popularly called 'Kalahasti malady', caused by Tylenchorhynchus brevilineatus, has been prevalent since 1976 in certain parts of Andhra Pradesh, India. A total of 1599 groundnut germplasm accessions and breeding lines were screened for resistance to the nematode disease in replicated trials on a farmer's field in a disease hot spot location during 1985-86. Twenty-three genotypes were identified as resistant and they had disease scores of 2.0 or less on a 1-5 disease scale. Of these, 14 genotypes were confirmed to be resistant in advanced screening trials in the 1986 rainy and the 1985/6 and 1986/7 post-rainy season. Resistance to the nematode was stable in all three trial sites in the 1986/7 post-rainy season. Most of the resistant genotypes have undesirable pod/seed characteristics. One of the resistant genotypes is a high-yielding breeding line (TCG 1518) and this is being released for use in disease-affected areas of Andhra Pradesh

publication date

  • 1993
  • 1993