Yield loss caused by Candidatus Liberibacter asiaticus in Persian lime, in Yucatan Mexico

Jorge Luis Flores-Sánchez, Gustavo Mora Aguilera, Emiliano Loeza-Kuk, J. Isabel López-Arroyo, Santiago Domínguez-Monge, Gerardo Acevedo-Sánchez, Pedro Robles-García

Abstract


The aim of this study was to estimate yield losses induced by the agent associated with Huanglongbing, Candidatus Liberibacter asiaticus (CLas) in Persian lime (Citrus latifolia Tanaka) in Mexico, by evaluating morphological and organoleptic fruit variables. A four-year old Persian lime orchard in the state of Yucatán, Mexico, was selected; the trees were under same disease management and infection; this feature was verified by qPCR. The study was conducted under four severity levels (0=healthy, 1=25, 2=50, 3=75, 4=100, percentage of canopy with HLB symptoms). Eight morphological and organoleptic variables were evaluated in a restricted random block design with healthy and CLas infected trees. The values of weight, size, skin thickness, juice volume (JV) and pH were statistically higher in fruits from healthy trees as well as in asymptomatic branches of positive trees, in comparison with symptomatic branches (Tukey, P=0.05). CLas induced reduction on weight (17.3%) and JV (18.6%), with more damage in trees showing 100% of canopy with HLB symptoms; the regression models were: Yweight= 217.2-4.2x+0.03x2, R2= 0.86; Yvolume = 645.4-11.7x+0.09x2, R2= 0.82. The weight reduction implicate a 2.4 tons/ha yield loss. The detrimental effect was associated with severity level and CLas concentration, we found that the intensity of the symptoms of HLB is a function of the bacterial concentration in the model Y[bacteria] = 1.174+0.8x-0.0067x2, R2 = 0.91. This is the first quantitative study of CLas effects on Persian lime.

Keywords


Severity; Huanglongbing; bacterial concentration; sour citrus

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References


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