Home⇛Annals of Tropical Research⇛vol. 37 no. 1 (2015)

Effects of Meloidogyne incognita on the Yield and Quality of Sweet Potato in the Humid Lowlands of Papua New Guinea

Macquin Maino | Shamsul Akanda

 

Abstract:

Field experiments were conducted in 2012 and 2013 to study the effects of inoculum densities of applied at 10, 100, Meloidogyne incognita 1000, 5000, and 10000 juveniles/eggs per 500 cm along with un- 3 inoculated control treatments, on a susceptible sweet potato variety, K9. At the highest initial inoculum (Pi), an average marketable tuber yield of 991 kg ha was recorded compared to 3495.5 kg ha from un-inoculated -1 -1 control, accounting for 72% relative yield reduction. Significant (p≤0.05) yield reduction of 37% was also recorded from the lowest Pi of 10 juveniles/500 cm . Probit analysis projected that 50% loss to marketable 3 tubers are likely to occur at populations as low as 40 nematodes/500 cm . 3 There was a high positive correlation (r = 0.87 ) between percentage ** relative yieldloss andinitialinoculum densities. There was significant (p≤0.01) impairment in marketable tuber quality with 4% cracking at 10 per 500 cm , increasing to 37% M. incognita 3 at the highest Pi of 10,000. Highly significant positive correlations were also observed for cracked tubers (r = 0.93 ) and non-marketable tubers (r ** = 0.96 ), when tested against the Pi densities of Nematode ** M. incognita. population was monitored during the cropping season revealed an overall significant increase (p≤0.05) in juvenile populations at mid-season (60 days after inoculation) from the initial inoculum populations. A reverse in trend ofjuvenile numbers was observed at harvest (120DAI).



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