Host-status and host-sensitivity of potato cultivars 'BP1' and 'Buffelspoort' to Meloidogyne javanica and Meloidogyne incognita race 2 under greenhouse and micro plot conditions
The withdrawal of highly effective synthetic chemical nematicides has left a void in management of plant parasitic nematodes in particular the root-knot nematodes. The objective of this study was to determine the host-status and host-sensitivity of potato cultivars BP1 and Buffelspoort against Meloidogyne javanica and M. incognita race 2 under greenhouse conditions, with cultivar BP1 further tested under micro-plot conditions. Two separate studies were conducted under greenhouse conditions arranged in a randomized split-plot design with main plots being the cultivars and subplots being seven levels of nematodes, replicated six times and micro plot with seven treatments arranged in RCBD replicated eight times. Greenhouse studies: cultivars were inoculated with seven different nematode levels of M. javanica and M. incognita race 2. The reproductive factor values (Rf) of greater than one were observed on both potato cultivars under the two Meloidogyne species. The final population (Pf) of M. javanica on BP1 and Buffelspoort was highly significant contributing 77 and 95% to the total treatment variation (TTV), respectively. The Rf contributed 9% to the TTV. Meloidogyne incognita race 2 significantly contributed 34 and 71% to the TTV in Rf and Pf, respectively, in Buffelspoort, whereas 38% contribution was recorded on BP1. Under micro-plot conditions, the Rf for BP1 was highly significant contributing 63% to the TTV. Measured plant variables were not reduced under greenhouse conditions, however, plant height was significantly reduced by M. javanica under micro plot conditions for BP1. In conclusion, the two potato cultivars were tolerant under greenhouse conditions and BP1 was susceptible to both tested Meloidogyne species under micro plot conditions.
Mulandana, N.K., Pofu, K.M. and Slabbert, M.M. (2020). Host-status and host-sensitivity of potato cultivars 'BP1' and 'Buffelspoort' to Meloidogyne javanica and Meloidogyne incognita race 2 under greenhouse and micro plot conditions. Acta Hortic. 1269, 119-128
host-sensitivity, nematodes, tolerance, Solanum tuberosum