Sustainable Management of Invasive Cassava Pests in Vietnam, Cambodia, and Thailand

Tokunaga, Hiroki; Baba, Tamon; Ishitani, Manabu; Ito, Kasumi; Kim, Ok Kyung; Hàm, Lê Huy; Le, Hoang Khac; Maejima, Kensaku; Natsuaki, Keiko T.; Đông, Nguyễn Văn; Nguyen, Hy Huu; Nguyen, Nien Chau; Vu, Nguyen Anh; Nomura, Hisako; Seki, Motoaki; Srean, Pao; Tanaka, Hirotaka; Touch, Bunna; Trinh, Hoat Xuan; Ugaki, Masashi; Uke, Ayaka; Utsumi, Yoshinori; Wongtiem, Prapit; Takasu, Keiji

doi:10.1007/978-981-10-7308-3_8

Cited by 7 publications

(10 citation statements)

References 46 publications

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“…Several serological and molecular methods are available for diagnosing SLCMV. Serological methods are most appropriate for mass screening while molecular methods, including PCR, are highly sensitive and can be used for detection and sequencing to the strain level (Tokunaga et al 2018 ). Most of these methods, however, require substantial amounts of labor and time and specialized laboratory equipment, and are not suitable for on-site detection in the field.…”

Section: Outbreaks Of Slcmv In Southeast Asiamentioning

confidence: 99%

“…Cassava stock seed production systems have been established at HLARC, Dong Nai, Vietnam and at UBB, Battambang, Cambodia. Conservation and propagation of healthy seed stocks of major cassava varieties have been established at HLARC and UBB using stock seed production fields and screenhouses, and tissue culture and aeroponics in laboratory facilities (Tokunaga et al 2018 , 2019 ). Several local farmers in Dong Nai, Vietnam, and Battambang and Banteay Meanchey, Cambodia have been engaged to produce healthy cassava seeds using the stock cassava seeds produced at HLARC and UBB.…”

Section: Satreps Projectmentioning

confidence: 99%

“…Major plant diseases and insect pests of cassava in Vietnam and Cambodia have been identified in order to develop appropriate pest management systems (Tokunaga et al 2018 ; Uke et al 2018 ). When the project launched, the main disease target was cassava witches’ broom caused by a phytoplasma.…”

Section: Satreps Projectmentioning

confidence: 99%

“…Although Africa currently has the largest production area in the world, cultivation as a food crop and as a source for biofuel has been increasing in Southeast Asia, where total cassava production is now more than 56 Mt/year (Fauquet et al 2018 ; Marx 2019 ). Cassava production is affected by dozens of factors across the producing countries, including diseases (Tokunaga et al 2018 ). In particular, two viral diseases, cassava mosaic disease (CMD) and cassava brown streak disease (CBSD), present the most serious threats to global production.…”

Section: Introductionmentioning

confidence: 99%

“…The SATREPS (Science and Technology Research Partnership for Sustainable Development) project “Development and dissemination of sustainable production systems based on invasive pest management of cassava in Vietnam, Cambodia and Thailand”, was launched in 2016 funded by the Japanese Government (Tokunaga et al 2018 ). SATREPS objectives were to develop pest management technologies and a system for the production and cultivation of healthy seedlings.…”

Section: Introductionmentioning

confidence: 99%

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Cassava mosaic disease and its management in Southeast Asia

et al. 2021

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Key message Status of the current outbreak of cassava mosaic disease (CMD) in Southeast Asia was reviewed. Healthy cassava seed production and dissemination systems have been established in Vietnam and Cambodia, along with integrated disease and pest management systems, to combat the outbreak. Abstract Cassava (Manihot esculenta Crantz) is one of the most important edible crops in tropical and subtropical regions. Recently, invasive insect pests and diseases have resulted in serious losses to cassava in Southeast Asia. In this review we discuss the current outbreak of cassava mosaic disease (CMD) caused by the Sri Lankan cassava mosaic virus (SLCMV) in Southeast Asia, and summarize similarities between SLCMV and other cassava mosaic begomoviruses. A SATREPS (Science and Technology Research Partnership for Sustainable Development) project “Development and dissemination of sustainable production systems based on invasive pest management of cassava in Vietnam, Cambodia and Thailand”, was launched in 2016, which has been funded by The Japan International Cooperation Agency (JICA) and The Japan Science and Technology Agency (JST), Japan. The objectives of SATREPS were to establish healthy seed production and dissemination systems for cassava in south Vietnam and Cambodia, and to develop management systems for plant diseases and insect pests of cassava. To achieve these goals, model systems of healthy seed production in Vietnam and Cambodia have been developed incorporating CMD-resistant planting materials through international networks with The International Center for Tropical Agriculture (CIAT) and The International Institute of Tropical Agriculture (IITA).

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Section: Outbreaks Of Slcmv In Southeast Asiamentioning

confidence: 99%

Section: Satreps Projectmentioning

confidence: 99%

Section: Satreps Projectmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Cassava mosaic disease and its management in Southeast Asia

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An efficient method of propagating cassava plants using aeroponic culture

Tokunaga

Anh

Đông

et al. 2019

Journal of Crop Improvement

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Supplementary Figure 1. Work flow of plant propagation using the aeroponic system. (1) Six-week-old tissue culture plants are transferred to the soil. (2) The wrapping film surrounding the plantlet is loosened about 2 weeks and the plantlet is cultivated to grow up for a period of up to 2-4 weeks. (3) Optional step: generation of a new shoot from a properly lignified stem cutting. (4) Obtain explants from a top and middle portion of stems of the plant source: i) plantlets derived from tissue culture, ii) renewal plants and iii) shoot parts obtained from properly lignified stem cuttings. (5) The explants are placed in the aeroponic system and covered with a wrapping film. (6) The film is gradually opened after three days. (7) Transfer the rooted plants to soil in pots. (8) Use the propagated plants for the next cycle of propagation in the aeroponic system after the rooted plants are grown for 2-4 weeks. Blue arrow: Preparation of the source material. Green arrows: Propagation cycle.

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Insecticidal activity of isolated Purpureocillium lilacinum PL1 against whitefly, Bemisia tabaci Gennadius (Hemiptera: Aleyrodidae) on cassava plantations in southern Viet Nam

Thi

Thien

et al. 2023

Egypt J Biol Pest Control

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Background Whitefly Bemisia tabaci Gennadius (Hemiptera: Aleyrodidae) is a plant-damaging insect in tropical and subtropical regions that causes agricultural damage worldwide, including in Viet Nam. The abuse of pesticides derived from chemicals has resulted in the evolution of insect-resistant strains, polluting the environment and threatening human health. Using entomopathogenic fungi (EPF) for biological control is an alternative strategy in integrated pest management. Hence, an attempt was conducted to isolate, characterize and evaluate the efficacy of EPF, Purpureocillium lilacinum against whitefly B. tabaci under laboratory and field conditions. Results Purpureocillium lilacinum PL1 (PL1) was isolated from the whitefly B. tabaci cadavers and subsequently identified using morphological study and internal transcribed spacer sequencing. Purpureocillium lilacinum PL1 had effectively grown and sporulated at temperatures ranging from 25 to 35 °C and throughout a broad pH range, which is particularly advantageous against the harsh tropical monsoon climate. Bioassay study indicated that 1 × 107 conidia/ml of P. lilacinum PL1 had a high lethality against the whitefly B. tabaci nymphs in vitro with efficiency was 88.24% after 7 days of treatment. The median lethal concentration (LC50) of P. lilacinum PL1 to B. tabaci after 7 days of treatment was 1.24 × 105 conidia/ml. In field conditions, 1 × 107 conidia/ml of P. lilacinum PL1 lowered the population of B. tabaci nymphs with efficacy was 78.86% after 2 batches, 7 days after treatments. Conclusion The findings indicated that P. lilacinum PL1 was effective in the biological control of B. tabaci nymphs, which could be a potential alternative to chemical pesticides for pest management.

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Sustainable Management of Invasive Cassava Pests in Vietnam, Cambodia, and Thailand

Cited by 7 publications

References 46 publications

Cassava mosaic disease and its management in Southeast Asia

Cassava mosaic disease and its management in Southeast Asia

An efficient method of propagating cassava plants using aeroponic culture

Insecticidal activity of isolated Purpureocillium lilacinum PL1 against whitefly, Bemisia tabaci Gennadius (Hemiptera: Aleyrodidae) on cassava plantations in southern Viet Nam

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