<i>Lasiodiplodia theobromae</i> causes a damaging dieback of cocoa in India

Kannan, C.; Karthik, M. N.; Priya, K. S.

doi:10.1111/j.1365-3059.2009.02192.x

Cited by 16 publications

(10 citation statements)

References 1 publication

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“…Improved management, including the appropriate use of fertilisers, combined with the introduction of resistant cocoa genotypes has been effective in mitigating the impact of this disease (Keane and Putter, 1992). Dieback in cocoa caused by L. theobromae has been observed in the Cameroons (Mbenoun et al, 2008) and in India (Kannan et al 2010). Vascular streaking has been observed in both cases.…”

Section: Dieback Diseasesmentioning

confidence: 79%

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Effect of Nutrition and Soil Function on Pathogens of Tropical Tree Crops

McMahon¹

2012

Plant Pathology

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Section: Dieback Diseasesmentioning

confidence: 79%

“…Vascular streaking has been observed in both cases. Kannan et al (2010) isolated the pathogen and reinoculated seedlings, which showed disease symptoms after 20 days. Infection by L. theobromae is facilitated by wounding or insect damage.…”

Section: Dieback Diseasesmentioning

confidence: 99%

Effect of Nutrition and Soil Function on Pathogens of Tropical Tree Crops

McMahon¹

2012

Plant Pathology

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“…Reported for the first time on cocoa in Cameroon in 1895 [4,5] and in South America in Ecuador [6], this pathogenic germ can cause the death of the tree over time [7]. The decline of the cocoa tree orchestrated by L. theobromae constitutes a permanent danger not only in India [8], Cameroon and Western Samoa, in the Philippines [9], but also in the Kisangani region of the Democratic Republic of Congo. Among the possible solutions to this scourge is common use and high concentrations of synthetic chemicals, which increases the risk of seeing toxic residues in fruits and/or leaves becoming poisonous over time.…”

Section: Introductionmentioning

confidence: 99%

In vitroevaluation of antifungal activity ofAgeratum conyzoides,Basella albaandMitracarpus villosuson the strain ofLasiodiplodia theobromaein the Kisangani Region / D R Congo

Kwembe

2020

Preprint

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Following our previous investigations relating to the in vitro evaluation of antifungal activity, this study focused on the demonstration of the inhibitory power of extracts of fresh and dry leaves of Ageratum conyzoides, Basella alba and Mitracarpus villosus on the strain of Lasiodiplodia theobromae, fungus responsible for brown rot of cocoa pod in the Kisangani region. In six repetitions on the Patato dextrose agar medium, the strain of L. theobromae was inhibited up to 68.1% by the aqueous extract of B. alba; 60.0% by the ethanolic extract of A. conyzoides and 55.2% by the ethanolic extract of M. villosus (all obtained from dry leaves). Only the fresh leaves of the aqueous (56.7%) and ethereal (51.1%) extracts of A. conyzoides showed high inhibition percentages compared to those of the extracts of the fresh leaves of B. alba and M. villosus. The extracts of the dry leaves showed high inhibition percentages followed by those of the fresh leaves and finally those of crude extracts after two days of incubation. Thus, in addition to the expected results, the plants studied are all active. These inhibitory powers could be very high for the secondary metabolites of the respective plants.

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“…Dieback disease caused by L. theobromae was a new constraint to cacao production in Cameroon (Mbenoun et al, 2008). It caused a damaging dieback of cacao in India (Kannan et al, 2010). This fungus was also reported become causal agent of vascular streak dieback (VSD)-like symptoms of cacao in Davao Region, Philippines (Alvindia & Gallema, 2017).…”

Section: Introductionmentioning

confidence: 99%

Fungal Pathogens Associated with Vascular Streak Dieback (VSD) Disease on Cacao in Special Region of Yogyakarta Province

Hendra

Wibowo

Suryanti

2019

JPTI

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Cacao is one of the pre-eminent crops plantation with high economic value. Indonesia's cacao beans production is the third largest in the world after Ivory Coast and Ghana. Vascular Streak Dieback (VSD) is one of the important diseases of cacao which caused a decreased yield either in quantity or quality. The disease is caused by the basidiomycete fungus Ceratobasidium theobromae (syn. Oncobasidium theobromae). Spores are carried by wind to spread, infect young leaves and penetrate through natural openings and colonize xylem vessel which could inhibit the transportation system in the plant tissue. There are several fungal pathogens associated with VSD diseases on cacao. This research aimed to study the fungi associate with VSD diseases on cacao in Special Region of Yogyakarta Province. Survey and sampling were conducted in cacao plantations in regencies of Gunungkidul, Kulon Progo, Bantul and Sleman. The severity of VSD disease in the regencies of Gunungkidul and Kulon Progo were high, while in the regencies of Sleman and Bantul were moderate. Eighty eight fungal isolates were isolated from infected petiole and stem. The in vitro pathogenicity test screened 32 fungal isolates causing necrotic and chlorotic symptoms on young healthy cacao leaves with and without wounding. The first symptoms appeared at 8-12 days after inoculation and fungal mycelium could grow at 1−3 days after inoculation. Those isolates collected showed a high diversity of colony morphology. Lasiodiplodia sp., Fusarium sp., Colletotrichum sp., and Pestalotiopsis sp. had been identified based on conidial morphology.

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Lasiodiplodia theobromae causes a damaging dieback of cocoa in India

Cited by 16 publications

References 1 publication

Effect of Nutrition and Soil Function on Pathogens of Tropical Tree Crops

Effect of Nutrition and Soil Function on Pathogens of Tropical Tree Crops

In vitroevaluation of antifungal activity ofAgeratum conyzoides,Basella albaandMitracarpus villosuson the strain ofLasiodiplodia theobromaein the Kisangani Region / D R Congo

Fungal Pathogens Associated with Vascular Streak Dieback (VSD) Disease on Cacao in Special Region of Yogyakarta Province

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