Relationship of Meloidogyne konaensis Population Densities to Coffee Growth. FENGRU ZHANG, Former Graduate Research Assistant, Department of Plant Pathology, University of Hawaii at Manoa, Honolulu 96822. D. P. SCHMITT, Professor, Department of Plant Pathology, University of Hawaii at Manoa, Honolulu 96822. Plant Dis. 79:446-449. Accepted for publication 12 January 1995. Copyright 1995 The American Phytopathological Society 446. DOI: 10.1094/PD-79-0446.

Coffee (Coffea arabica L,) shoot and root growth as affected by Meloidogyne konaensis was determined under greenhouse and field conditions. The greenhouse test involved five coffee cultivars: Guatemalan, S. L. 28, Guadalupe, Mundo Novo, and Red Bourbon. Meloidogyne konaensis damaged all coffee cultivars under greenhouse conditions. Shoot growth was sup-pressed at all inoculum densities (150-18,750 eggs per plant). Dry shoot and root weights were negatively correlated with the log10(Pi + 1) of M. konaensis. Minimum predicted shoot height and dry shoot and root weights were 35.2, 7.6, and 10.1% of the maximum predicted levels, respectively. Growth of cultivar Guatemalan and Guatemalan as a scion on Deweveri rootstock was characterized in a field naturally infested with M. konaensis. A negative linear regression relationship (r = 0.95) existed between the population density of this nematode and percent increase in coffee height in the field.