QUANTITATIVE ASPECTS OF THE DEVELOPMENT OF MELOIDOGYNE-ARENARIA LARVAE IN GRAPEVINE VARIETIES AND ROOTSTOCKS

  • 1 January 1979
    • journal article
    • research article
    • Vol. 11  (2) , 168-174
Abstract
The development and productivity of parasitic stages of M. arenaria were quantitatively defined in 14 varieties or rootstocks of grapevine [Vitis vinifera]. Mean development to maturity was related linearly to the number of degree-hours above 10.degree. C temperature experienced from the time of penetration in all cultivars in which nematode adulthood was achieved. Averaged across varieties, 13,142 heat units were required for development of the mean individual to maturity. The standard deviation of the developing individuals about the mean, expressed as a proportion with 1 representing adulthood, did not differ with time or among varieties after 7000 degree-hours had elapsed. Earliest egg production was observed after 7662 degree-hours, averaged across varieties, considerably before mean development to maturity. Varieties were also ranked relative to the number of larvae establishing infection sites, and the rate of egg production per adult female. Varieties could be grouped according to their levels of horizontal resistance.

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