Development of a rapid methodology for biological efficacy assessment in banana plantations: application to reduced dosages of contact fungicide for Black Leaf Streak Disease (BLSD) control

2018 ◽  
Vol 75 (4) ◽  
pp. 1081-1090 ◽  
Author(s):  
Adel Bakache ◽  
Jean-Paul Douzals ◽  
Bernard Bonicelli ◽  
Eric Cotteux ◽  
Luc de Lapeyre de Bellaire ◽  
...  
Keyword(s):  
Biological Efficacy ◽  
Efficacy Assessment ◽  
Black Leaf Streak ◽  
Black Leaf Streak Disease ◽  
Banana Plantations

scholarly journals Cox Processes Associated with Spatial Copula Observed through Stratified Sampling

Mathematics ◽  
2021 ◽  
Vol 9 (5) ◽  
pp. 524
Author(s):  
Walguen Oscar ◽  
Jean Vaillant
Keyword(s):  
Environmental Effects ◽  
Gaussian Copula ◽  
Spatial Dependency ◽  
Spatial Effects ◽  
Doubly Stochastic ◽  
Cox Processes ◽  
Black Leaf Streak ◽  
Spatial Random Field ◽  
Black Leaf Streak Disease ◽  
Spatial Count Data

Cox processes, also called doubly stochastic Poisson processes, are used for describing phenomena for which overdispersion exists, as well as Poisson properties conditional on environmental effects. In this paper, we consider situations where spatial count data are not available for the whole study area but only for sampling units within identified strata. Moreover, we introduce a model of spatial dependency for environmental effects based on a Gaussian copula and gamma-distributed margins. The strength of dependency between spatial effects is related with the distance between stratum centers. Sampling properties are presented taking into account the spatial random field of covariates. Likelihood and Bayesian inference approaches are proposed to estimate the effect parameters and the covariate link function parameters. These techniques are illustrated using Black Leaf Streak Disease (BLSD) data collected in Martinique island.

scholarly journals Varietal Differences in the Volatile Profile of Bananas with Resistance to Black Leaf Streak Disease

2014 ◽  
pp. 597-600
Author(s):  
Maria Flávia A. Penha ◽  
Victor C. Castro Alves ◽  
Náyra O.F. Pinto ◽  
Hilton Cesar R. Magalhães ◽  
Francisco J.B. Reifschneider ◽  
...  
Keyword(s):  
Volatile Profile ◽  
Varietal Differences ◽  
Black Leaf Streak ◽  
Black Leaf Streak Disease

EFFECT OF BLACK LEAF STREAK DISEASE ON BANANA FRUIT QUALITY

2013 ◽  
pp. 339-343
Author(s):  
L.A. Saraiva ◽  
F.P. Castelan ◽  
B.R. Cordenunsi ◽  
M. Chillet
Keyword(s):  
Fruit Quality ◽  
Banana Fruit ◽  
Black Leaf Streak ◽  
Black Leaf Streak Disease

Tackling black leaf streak disease and soil fertility constraints to enable the expansion of plantain production to grassland in the humid tropics

2012 ◽  
Vol 58 (2) ◽  
pp. 175-181 ◽  
Author(s):  
Lindsey Norgrove ◽  
J. Roberto Tueche ◽  
Kim S. Jacobsen ◽  
Alphonse Nkakwa Attey ◽  
Keith Holmes
Keyword(s):  
Soil Fertility ◽  
Humid Tropics ◽  
Black Leaf Streak ◽  
Black Leaf Streak Disease

scholarly journals Yield and Fruit Quality Traits of Two Banana Cultivars Grown at Two Locations in Puerto Rico under Black Leaf Streak Disease Pressure

2021 ◽  
pp. 1-8
Author(s):  
Ricardo Goenaga ◽  
Brian Irish ◽  
Angel Marrero
Keyword(s):  
Puerto Rico ◽  
Soluble Sugars ◽  
Fruit Production ◽  
Production Costs ◽  
Relative Advantage ◽  
Caribbean Region ◽  
Black Sigatoka ◽  
Long Term Study ◽  
Black Leaf Streak ◽  
Black Leaf Streak Disease

Banana (Musa acuminata AAA) is the most exported fruit worldwide and represents a major source of revenue for Central American and South American countries as well as the Caribbean region, among others. Black leaf streak disease (BLSD) or black sigatoka, caused by Pseudocercospora fijiensis (formerly Mycosphaerella fijiensis), is responsible for significant losses to this crop due to the high susceptibility of the most economically important cultivars. BLSD does not immediately kill banana plants, but it causes severe leaf necrosis that results in reduced photosynthetic area, thereby adversely impacting bunch weight and fruit production. Without cultural and chemical control, yields can be reduced by 20% to 80%, depending on severity. This study evaluated ‘FHIA-17’, a BLSD-resistant synthetic hybrid (AAAA), against ‘Grand Nain’, a standard commercial cultivar with no BLSD tolerance, at two locations in Puerto Rico on Ultisol (Corozal site) and Oxisol (Isabela site) soils where BLSD was not managed. Significantly lower bunch yield (45,990 kg·ha−1) and significantly fewer fruit (220,671 fruit/ha) were obtained at Corozal than at Isabela (53,755 kg·ha−1; 380,241 fruit/ha). Lower production at Corozal was the result of higher severity of BLSD at this location than at Isabela and to soil factors interfering with optimum nutrient uptake. Average fruit production of ‘FHIA-17’ was significantly higher than that of ‘Grand Nain’ at both locations, with bunch yields of 68,105 and 72, 634 kg·ha−1 at Corozal and Isabela, respectively. Fruit of the third-upper hand was significantly longer for ‘FHIA-17’ at Corozal but not different at Isabela; however, ‘FHIA-17’ fruit in this hand were of significantly greater diameter. Fruit in the last hand of ‘FHIA-17’ were significantly longer than in ‘Grand Nain’ at Corozal, but of significantly greater diameter at both locations. At both locations, the mean fruit weight was significantly higher in ‘FHIA-17’ than in ‘Grand Nain’. The number of functional leaves present at flowering and at harvest was significantly higher in ‘FHIA-17’ than in ‘Grand Nain’ at both locations, indicating more availability of photosynthetic area in ‘FHIA-17’ during the fruit-filling period. The harvest cycle of ‘FHIA-17’ was significantly longer than for ‘Grand Nain’. It took 315 and 204 more days in Corozal and Isabela, respectively, to harvest three cycles (mother crop and two ratoon crops) of ‘FHIA-17’ than for ‘Grand Nain’. No significant differences were found for starch and soluble sugars in green unripe or fully mature fruit among cultivars. In this long-term study, ‘FHIA-17’ showed to have good production and resistance against BLSD and is a viable alternative to current commercial cultivars. Its relative advantage of reduced production costs by not needing fungicide applications should be weighed against its longer harvest cycle to produce a fruit bunch.

scholarly journals A Quantitative Assay Using Mycelial Fragments to Assess Virulence of Mycosphaerella fijiensis

2007 ◽  
Vol 97 (8) ◽  
pp. 916-929 ◽  
Author(s):  
Bruno Giuliano Garisto Donzelli ◽  
Alice C. L. Churchill
Keyword(s):  
Image Analysis ◽  
Mycosphaerella Fijiensis ◽  
Analysis Software ◽  
Leaf Section ◽  
Small Areas ◽  
Image Analysis Software ◽  
Black Leaf Streak ◽  
Black Leaf Streak Disease ◽  
Banana Leaf ◽  
Degree Of Fragmentation

We describe a method to evaluate the virulence of Mycosphaerella fijiensis, the causal agent of black leaf streak disease (BLSD) of banana and plantain. The method is based on the delivery of weighed slurries of fragmented mycelia by camel's hair brush to 5-by-5-cm areas on the abaxial surface of banana leaf blades. Reliable BLSD development was attained in an environmental growth chamber with stringent lighting and humidity controls. By localizing inoculum onto small areas of large leaves, we achieved a dramatic increase in the number of strains that can be tested on each leaf and plant, which is critical for comparing the virulence of numerous strains concurrently. Image analysis software was used to measure the percentage of each inoculated leaf section showing BLSD symptoms over time. We demonstrated that the level of disease of four isolates was correlated with the weight of the mycelium applied and relatively insensitive to the degree of fragmentation of hyphae. This is the first report demonstrating that weighed mycelial inoculum, combined with image analysis software to measure disease severity, can be used to quantitatively assess the virulence of M. fijiensis under rigorously controlled environmental conditions.

Salicylic Acid And Acibenzolar-s-methyl Induced Resistance Against Toxic Effect Of Juglone, A Toxin Of Mycosphaerella Fijiensis Causal Agent Of Banana Black Leaf Streak Disease

2014 ◽  
Vol 3 (3) ◽  
pp. 204-217
Author(s):  
AMARI Ler-N'Ogn Dadé Georges Elisée ◽  
CHERIF Mamadou ◽  
Hilaire Tanoh Kouakou ◽  
CAMARA Brahima ◽  
KONÉ Daouda
Keyword(s):  
Salicylic Acid ◽  
Disease Management ◽  
Toxic Effect ◽  
Systemic Acquired Resistance ◽  
Acquired Resistance ◽  
Mycosphaerella Fijiensis ◽  
Low Concentrations ◽  
Black Leaf Streak ◽  
Black Leaf Streak Disease ◽  
Banana Leaves

Salicylic acid and its analogues are considered the most important compounds which can be activated a systemic acquired resistance (SAR) in plants. The disadvantages and limits related to the usual methods in particular fungicide spray to the control of black leaf streak disease (BLSD) require research of approaches more respectful of the environment for this disease management such as the use of SAR inducers. The effects of Salicylic acid (SA) and Acibenzolar-S-methyl (ASM) on the interaction of two susceptible cultivars of banana (Orishele and Corne 1) with the hemibiotrophic fungal Mycosphaerella fijiensis and his toxin (juglone) were investigated. The results showed that SA and ASM at low concentrations (25 and 50 µg/ml) did not affect M. fijiensis development but have the capacity to induce protection into sensitive banana against juglone toxic effect. These SAR inducers reduced the intensity of the necrosis due to the juglone and lengthened the incubation period of M. fijiensis after inoculation of banana leaves. The expression of the resistance induced was related to the variety of banana. More significant effectiveness of protection was obtained with ASM in particular on Corne 1. A total protection against the induction of necrosis was kept up to 100 µg/ml of juglone 2 to 3 weeks after application of ASM on the soil and on the leaves of banana. ASM constitutes a viable and noncontaminant option in the fight against to BLSD because of his non-inhibiting action on M. fijiensis and excellent protection into banana when roots and leaves were treated.

Sign in / Sign up

Export Citation Format

Share Document