Interactive effects of Meloidogyne incognita, salinity and seasonal length on productivity and growth of pepper in Limpopo province, South Africa
2012
Aluvilu, A. (University of Limpopo, Sovenga (South Africa). School of Agricultural and Environmental Sciences) | Mashela, P. (University of Limpopo, Sovenga (South Africa). School of Agricultural and Environmental Sciences) | Pofu, K. (University of Limpopo, Sovenga (South Africa). School of Agricultural and Environmental Sciences)
Capsicum annuum cv. 'Serrano' is tolerant to both salinity and the root-knot nematode (Meloidogyne incognita). Most salt-tolerant cultivars are not resistant to nematodes, vice versa. A study was conducted to determine how M. incognita race 2 and salinity would affect growth of cv. 'Serrano' at different time intervals. Treatments were arranged in a split-plot design with the main factor being nematode, sub-plot being salinity and sub-sub-plot harvest time. At harvest, second-order interactions for all variables were not significant (P:5 0.05), while nematode x time interaction contributed 9%, 23%, 22%, 13%, 14% and 16% to the total treatment variation (TTV) in fresh fruit mass, dry shoot mass, dry root mass, stem diameter, plant height and chlorophyll content, respectively. Salt x time interaction contributed to TTV in dry root mass, stem diameter and plant height by 4%, 8% and 5%, respectively. Results suggested that the interactions were additive, multiplicative and/or synergistic on various variables. In conclusion, both nematode and salinity must be managed overtime for successful growth and productivity of cv. 'Serrano'.
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