RELATIVE SUSCEPTIBILITY/RESISTANCE OF CITRUS ROOTSTOCKS TO CITRUS NEMATODE (TYLENCHULUS SEMIPENETRANS)

摘要

Thirteen citrus rootstocks were screened for their susceptibility/resistance to Tylenchulus semipenetrans in a greenhouse experiment. Data indicated that three rootstocks viz., Carrizo citrange, Savage citrange and Yuma citrange allowed the minimum number of females of Tylenchulus semipenetrans in the roots (< 1 / cm of root), hence categorized as resistant. Three rootstocks viz., Bitter sweet orange, Sachton citrumelo and citrumelo 1452 were rated as moderately resistant (< 2/cm of root). The remaining seven rootstocks viz., Gada Dahi, Brazilian sour orange, sour orange, grapefruit, rough lemon, chakotra and kharna khatta proved to be susceptible to T. semipenetrans.