Abstract
ABSTRACT In the present study, the damaging effects of six inoculum densities of Meloidogyne incognita were compared on a resistant (Long Green) and a highly susceptible (Mirage) cultivar of cucumber. All the inoculum densities of M. incognita resulted in significant reductions in growth and yield variables of both the cultivars over their controls. The reductions in resistant cultivar were significantly lower as compared to the highly susceptible cultivar at all inoculum levels. The highest inoculum level caused the maximum reductions in growth and yield variables while the lowest inoculum level resulted in the minimum reductions. The reductions in growth and yield variables increased with an increase in the inoculum density showing a positive relationship. On the other hand, the inoculum levels caused an increase in root weight. The higher inoculum levels caused higher increases while at lower inoculum levels, the increases were lower. The increases in root weights were significantly lower in the resistant cultivar when compared to the highly susceptible one showing a direct relationship between the increase in root weight and inoculum levels. Similarly, significant differences in number of galls and egg masses were noticed between the resistant and highly susceptible cultivar at all inoculum levels. The galls produced on highly susceptible cultivar were significantly higher as compared to the resistant one. A direct relationship was observed between inoculum levels and number of galls and egg masses. On the other hand, all the inoculum levels varied significantly regarding reproductive factor on the resistant and highly susceptible cultivars.
Highlights
Like fungal, bacterial and viral pathogens, nematodes have a qualitative and quantitative impact on crops and resultantly have profound deleterious effects on food security, in poverty-stricken regions of the world
The damaging effects of inoculum levels of M. incognita were assessed on a resistant cultivar of cucumber viz. Long Green and a highly susceptible one viz. Mirage (Mukhtar et al 2013)
All the inoculum densities of M. incognita resulted in significant reductions in growth variables of both cultivars over their controls
Summary
Bacterial and viral pathogens, nematodes have a qualitative and quantitative impact on crops and resultantly have profound deleterious effects on food security, in poverty-stricken regions of the world. Similar to all other crops and vegetables, cucumber is vulnerable to many biotic and abiotic perturbations that cause reductions in yield. Root-knot nematodes of the genus Meloidogyne are the most widespread and economically important (Khan et al 2019; Mukhtar and Hussain 2019; Asghar et al 2020; Azeem et al 2020). These nematodes complete their life cycles in a
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