Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Abstract

Effect of initial population densities of Pratylenchus brachyurus on the growth of Coffea arabica cv. Mundo Novo and C. canephora cv. Apoatã seedlings.

Abstract

The effect of initial population densities (Pi) of Pratylenchus brachyurus on the growth of Coffea arabica cv. Mundo Novo and C. canephora cv. Apoatã seedlings was studied under greenhouse conditions. The initial population density of P. brachyurus consisted of 0, 2, 6, 18, or 54 nematodes/cm3 of soil. Plant height, fresh root weight, top dry weight, and reproduction factor (RF) were evaluated 90 days later. The data for plant height, fresh root weight, and top dry weight were fitted to the Seinhorst nonlinear model y=m+(l-m).zPi-T. The tolerance limit (T) was zero for the three parameters, showing that growth of coffee plants was reduced by even low Pi of P. brachyurus. However, the reproductive rate was low (RF<1), indicating that C. arabica cv. Mundo Novo and C. canephora cv. Apoatã were intolerant hosts for the nematode.