Abstract
Phytophthora spp. are one the most common soil-borne pathogens in citrus crops, in which Phytophthoranicotianae and P. citrophthora are the most relevant species, causing disease problems worldwide, such as foot rot and gummosis of the trunk, branch canker, brown rot of fruit, feeder root rot in orchards, and seedling damping-off in nurseries. Phytophthora-tolerant citrus rootstocks are essential for its control and for the success of the citrus industry. The aim of this study was to determine the susceptibility of new citrus rootstocks with low HLB incidence to Phytophthora diseases. Thus, plants of several commercial and new citrus rootstocks originating in different breeding programs were inoculated with an isolate of P. nicotianae. Thirty days post inoculation (DPI), the damage of lesion length in stem was measured for each plant. These results displayed a different susceptibility response to the damage caused by P. nicotianae among the citrus rootstocks tested. Thus, eleven new citrus rootstocks (B11R3T25, B11R5T25, B11R5T49, B11R5T60, B11R5T64, N40R1T18, N40R1T19, N40R3T25, WGFT + 50-7, UFR-6, and CL-5146), which have not been previously studied against Phytophthora diseases, improved the tolerance effect of Carrizo citrange. Our findings provide useful information for citrus growers on rootstock selection to address incidence problems caused by Phytophthora spp.
Highlights
Phytophthora spp. are the most serious soil-borne pathogens of citrus trees worldwide, and they usually inhabit these crop soils. Ten species of this genus have been described as the causal agents of several citrus diseases, such as foot rot and gummosis of the trunk, branch canker, brown rot of fruit, feeder root rot in orchards, and seedling damping-off in nurseries [2,3,4,5,6,7]
Our findings about thethe tolerance response to foot lesion in the stem caused by P. nicotianae among new different citrus rootstock, which is described length in the stem caused by P. nicotianae among new different citrus rootstock, which is as one of the most species causing diseases, such as foot described as one of relevant the most Phytophthora relevant Phytophthora species citrus causing citrus diseases, suchrot as and rot gummosis of the trunk
Cultivation of citrus rootstocks tolerant to diseases caused by Phytophthora spp. is the most effective methodology to reduce these damages
Summary
The citrus industry has a great influence on Spanish agriculture. Spain is the top citrus producing country in the European Union and the sixth in the world, with a total production of over six million tons [1]. Phytophthora spp. are the most serious soil-borne pathogens of citrus trees worldwide, and they usually inhabit these crop soils. Ten species of this genus have been described as the causal agents of several citrus diseases, such as foot rot and gummosis of the trunk, branch canker, brown rot of fruit, feeder root rot in orchards, and seedling damping-off in nurseries [2,3,4,5,6,7].
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