Symptoms shown by late-stage larvae of the West Indian sweet potato weevil Euscepes postfasciatus (Coleoptera: Curculionidae) infected with Farinocystis sp. (Neogregarinida: Lipotrophidae)

Tsurui, Kaori; Ohishi, Tsuyoshi; Kumano, Norikuni; Teruya, Kiyohito; Toyosato, Tetsuya; Shiromoto, Keiko

doi:10.1007/s13355-015-0329-8

Cited by 4 publications

(1 citation statement)

References 24 publications

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“…In a Japanese mass rearing facility, E. postfasciatus was infected by a neogregarine protozoan pathogen Farinocystis sp. (an undescribed species) causing population decline suggesting scope for the use of this pathogen as a biological control agent (Kumano et al, 2010;Hosokawa et al, 2015;Tsurui et al, 2015) but this does not seem to have been pursued.…”

Section: Other Biological Control Agentsmentioning

confidence: 99%

Invertebrate pests and diseases of sweetpotato (Ipomoea batatas): a review and identification of research priorities for smallholder production

Johnson

Gurr

2016

Ann Appl Biol

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Sweetpotato has been the subject of little research worldwide compared with other major crop staples, and this is especially so for less developed countries where sweetpotato is critical for food security. This review synthesises information on plant protection issues that affect smallholder sweetpotato farmers in less developed countries to identify major issues and suggest research priorities. Though the pests and diseases of sweetpotato in less developed countries are largely common to industrialised systems, their relative importance differs and losses tend to be more severe as a result of differing agronomic practices and relative unavailability of management options and technical support that are important in developed countries. Smallholders are heavily reliant on cultural practices such as traditional forms of biological control using ants and livestock, fallowing and composting (sometimes with plant materials having biocidal properties). Crop protection methods that have been developed for use in sweetpotato production in developed countries, such as pathogen-tested planting material, early maturing varieties, pheromone trapping and pesticides are less accessible to, and relevant for, smallholders. Smallholders also typically harvest a given crop progressively which extends the period over which storage roots are potentially vulnerable to attack but reduces the risk of post-harvest losses. Human population growth in developing countries is leading to an increase in cropping intensity with shorter fallow periods and more years of continuous crops. This has the dual effect of depleting soil nutrients and increasing the potential for pest and pathogen build-up. Associated with this, the adoption of strategies to manage crop nutrition, such as not burning crop residues, promote carryover of pests and pathogen inocula. As a consequence of these factors, sweetpotato yield losses from diseases, especially viruses, and pests, particularly weevils, can be high. Climate change is likely to result in more frequent drought and this will increase losses caused by sweetpotato weevils that are favoured by dry conditions. This review of sweetpotato pests and their management options concludes with suggestions for some future research priorities including the combination of traditional practices that have pest management outcomes with relevant practices from industrial production that are able to be transferred or modified for use in smallholder production. Increased technical support for decision making and diagnostics, including molecular approaches that have scope for field use, will be important in reducing the burden imposed by biotic threats to this important global crop.

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Section: Other Biological Control Agentsmentioning

confidence: 99%

Invertebrate pests and diseases of sweetpotato (Ipomoea batatas): a review and identification of research priorities for smallholder production

Johnson

Gurr

2016

Ann Appl Biol

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Host plants influence female oviposition and larval performance in West Indian sweet potato weevils Euscepes postfasciatus (Coleoptera: Curculionidae)

et al. 2017

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Occurrence of Neogregarine-Like Protozoan <i>Farinocystis</i> sp. in an Artificial Diet Mass-Rearing System in the West Indian Sweet Potato Weevil, <i>Euscepes postfasciatus</i>（Coleoptera: Curculionidae）

大石¹,

鶴井²,

照屋³

2016

Japanese journal of applied entomology and zoology

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Abstract:In the process of the mass rearing of West Indian sweet potato weevils Euscepes postfasciatus Fairmaire on an artificial diet, the eggs of the weevil are washed and disinfected before inoculation to remove the risk of infection by the neogregarine protozoan Farinocystis sp. However, protozoan infection was recently detected in this mass-rearing system. To identify the infection route, we conducted a detailed investigation of the occurrence of the Farinocystis sp. infecting the weevils in larval rearing and egg collection containers. In the larval rearing containers, the infection rates at 8 weeks after egg inoculation were 56.1% for larvae, 14.7% for pupae, and 1.5% for adults. Investigations of 130 rearing containers detected only 5 containers with absolutely no infection. In the egg collection container, the infection rate increased with the number of days elapsed in both sexes but the rate of increase was significantly higher for males. These findings suggested that the treatment was not sufficient to completely eliminate or deactivate the Farinocystis sp. in the larval rearing containers, causing contamination of infected weevils in the egg collecting containers and, possibly, subsequent horizontal infection.

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Symptoms shown by late-stage larvae of the West Indian sweet potato weevil Euscepes postfasciatus (Coleoptera: Curculionidae) infected with Farinocystis sp. (Neogregarinida: Lipotrophidae)

Cited by 4 publications

References 24 publications

Invertebrate pests and diseases of sweetpotato (Ipomoea batatas): a review and identification of research priorities for smallholder production

Invertebrate pests and diseases of sweetpotato (Ipomoea batatas): a review and identification of research priorities for smallholder production

Host plants influence female oviposition and larval performance in West Indian sweet potato weevils Euscepes postfasciatus (Coleoptera: Curculionidae)

Occurrence of Neogregarine-Like Protozoan <i>Farinocystis</i> sp. in an Artificial Diet Mass-Rearing System in the West Indian Sweet Potato Weevil, <i>Euscepes postfasciatus</i>（Coleoptera: Curculionidae）

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