The disease severity estimation of bacterial spot disease of processing tomato based on hyperspectral remote sensing

Passion fruit is infected by many plant pathogens, including Xanthomonas axonopodis pv. passiflorae, causing bacterial spot disease. This disease has been impaired orchards all over Brazil, resulting in low yield and production. In addition, it results in premature death of plants in the field. This study aimed to analyze the reaction of sour passion fruit genotypes to bacterial spot in leaves under protected cultivation (Experiment 1) and the bacterial spot severity in fruits under field conditions (Experiment 2). Experiment 1 was carried out as a randomized block design (RBD) with subdivided plots, composed of 24 treatments (genotypes), three replications, five plants per plot, and five evaluation dates. Bacterial spot incidence and severity were evaluated using a 0 to 5 grading scale. Evaluations were carried out at a 7-day interval after disease symptoms first appeared. Genotypes differed for mean disease severity and incidence. The bacterial spot disease evaluations showed that genotypes MAR20#46 P3 R4 X Rosa Claro R4 and MD 16 P3 X MAR20#39 P1 R4 presented the lowest scores for the disease incidence in the leaves. S2L AP R1, MAR20#19 ROXO R4 X ECRAM P3 R3, and MD 16 P3 X MAR20#39 P1 R4 were the genotypes with the lowest disease severity scores. Experiment 2 consisted of a RBD with 24 treatments, three replications, and seven plants per plot. Severity assessments were monthly performed on five fruits per plot, totaling three evaluation dates. In this experiment, the percentage of total fruit area with necrotic lesions was measured using a 1 to 4 grading scale. Bacterial spot severity assessments in fruits identified interactions between genotypes and evaluation dates (p ≤ 0.05). The lineages S2L MAR 20#15 R4 and S2L MAR20#19 R2 showed the lowest mean severity scores of bacterial spot in fruit. The genotypes with the lowest mean scores were selected to continue the breeding program.

Download Full-text

Erratum to “Reclassification of the Xanthomonads Associated with Bacterial Spot Disease of Tomato and Pepper”

Systematic and Applied Microbiology ◽

10.1016/j.syapm.2005.05.002 ◽

2006 ◽

Vol 29 (1) ◽

pp. 85-86 ◽

Cited By ~ 4

Author(s):

Jeffrey B. Jones ◽

George H. Lacy ◽

Hacene Bouzar ◽

Robert E. Stall ◽

Norman W. Schaad

Keyword(s):

Bacterial Spot ◽

Spot Disease ◽

Bacterial Spot Disease

Download Full-text

Environmental and inoculum effects on epidemiology of bacterial spot disease of stone fruits and development of a disease forecasting system

European Journal of Plant Pathology ◽

10.1007/s10658-018-1507-7 ◽

2018 ◽

Vol 152 (3) ◽

pp. 635-651 ◽

Cited By ~ 2

Author(s):

G. Morales ◽

C. Moragrega ◽

E. Montesinos ◽

I. Llorente

Keyword(s):

Disease Forecasting ◽

Stone Fruits ◽

Bacterial Spot ◽

Spot Disease ◽

Bacterial Spot Disease ◽

Forecasting System

Download Full-text

Monitoring of Wheat Powdery Mildew Disease Severity Using Multiangle Hyperspectral Remote Sensing

IEEE Transactions on Geoscience and Remote Sensing ◽

10.1109/tgrs.2020.3000992 ◽

2020 ◽

pp. 1-12

Author(s):

Li He ◽

Shuang-Li Qi ◽

Jian-Zhao Duan ◽

Tian-Cai Guo ◽

Wei Feng ◽

...

Keyword(s):

Remote Sensing ◽

Powdery Mildew ◽

Disease Severity ◽

Hyperspectral Remote Sensing ◽

Wheat Powdery Mildew ◽

Powdery Mildew Disease

Download Full-text

Intervals and Number of Applications of Acibenzolar-S-Methyl for the Control of Bacterial Spot on Processing Tomato

Plant Disease ◽

10.1094/pdis-11-15-1286-re ◽

2016 ◽

Vol 100 (10) ◽

pp. 2126-2133 ◽

Cited By ~ 12

Author(s):

Nadson de Carvalho Pontes ◽

Abadia dos Reis Nascimento ◽

Adelmo Golynski ◽

Luiz Antonio Maffia ◽

José Rogério de Oliveira ◽

...

Keyword(s):

Disease Severity ◽

Systemic Acquired Resistance ◽

Acquired Resistance ◽

Soluble Solids ◽

Cost Ratio ◽

Soluble Solids Content ◽

Bacterial Spot ◽

Processing Tomato ◽

Standard Program ◽

Solids Content

Acibenzolar-S-methyl (ASM) is a plant activator that triggers systemic acquired resistance that is labeled for use in Brazil for managing tomato bacterial spot. The aim of this study was to define the optimum relationship between interval and number of applications of ASM for the most efficacious control of bacterial spot on processing tomato. Four intervals between applications (4, 7, 10, and 14 days) and four application frequencies (4, 6, 8, and 10 applications) were evaluated in five trials performed between 2010 and 2011 in Brasília, Distrito Federal, and in Morrinhos, in the state of Goiás. Copper hydroxide (CH) was applied after ASM applications to complete 13 applications per growing season. Two check treatments were added: standard CH weekly applications and untreated. The following variables were evaluated: severity of bacterial spot, yield, percentage of ripe and rotten fruit, soluble solids content, and the benefit/cost ratio. Disease severity varied between treatments in three trials and yield varied in two trials. A greater number of applications resulted in a reduction of bacterial spot, and the ideal interval between applications was between 8 to 10 days. However, there was a reduction in yield with 10 ASM applications. The temporal effect of ASM applications on bacterial spot severity was evaluated under greenhouse conditions. Reduction in disease severity was observed up to 6 days following ASM application. Additionally, the weekly treatment of seven applications of ASM followed by six applications of CH was compared with a standard program of CH under commercial production conditions in Itaberaí, Goiás, where bacterial spot occurred naturally. The program with ASM and CH resulted in significantly less foliar disease severity than the standard program, which did not result in yield gains. In addition, no differences were detected between the two programs for soluble solids content, industrial yield, plant height, and percentage of ripe and rotten fruit.

Download Full-text