INFLUENCE OF LOW-TEMPERATURE ON RATE OF DEVELOPMENT OF MELOIDOGYNE-INCOGNITA AND MELOIDOGYNE-HAPLA LARVAE

  • 1 January 1978
    • journal article
    • research article
    • Vol. 10  (2) , 166-171
Abstract
Development of M. incognita and M. hapla larvae in clover [Melilotus alba] roots was studied at 20.degree., 16.degree., 12.degree. and 8.degree. C in growth chambers and in the field from fall through spring, in North Carolina [USA]. Larvae of both species invaded roots and developed at 20.degree., 16.degree. and 12.degree. C, but not at 8.degree. C. The time necessary to complete the larval stages at each temperature was determined. The minimal temperature for development of M. incognita larvae was 10.08.degree. C, and 8.8.degree. C for M. hapla larvae. In the field, soil temperature at 10 cm deep was favorable for development of larvae until the end of Nov., and again from Feb. on. All stages of the nematodes survived freezing temperatures in the roots. Reproduction of both species was evident in March or April after inoculation and accumulation of 8500-11,250 degree-hours.