ONTOGENY OF DAUCUS-CAROTA INFECTED WITH MELOIDOGYNE-HAPLA

  • 1 January 1978
    • journal article
    • research article
    • Vol. 10  (2) , 188-194
Abstract
The ontogeny of carrots (D. carota cv. Spartan Premium) grown under greenhouse conditions in pots in organic soil infected with M. hapla was influenced detrimentally as early as 4 days after seeding, as determined through analysis of plant surface area, dry wt, fresh wt, net assimilation rate, relative growth rate and leaf-area ratio. Only 58% of the diseased carrots were suitable for fresh market, compared with 97% of those grown in nematode-free soil. Growth and development of the shoot system (height, surface area, dry wt and fresh wt) were retarded by M. hapla as early as 12 days after seeding. During the first 12 days after seeding, root dry wt was greater for diseased plants than for controls. Root growth and development (surface area, dry wt and fresh wt) associated with this nematode, however, were retarded as early as 16 days after seeding. M. hapla caused a delay in the occurrence of 2nd, 4th and 5th order roots, and an increase in the occurrence of 6th order roots in infected plants. Parasitized plants had 44% fewer roots (primary through 6th order) and 50% less total root length.

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