Storage rots of taro (Colocasia esculenta) in the British Solomon Islands

Jackson, G. V. H.; Gollifer, D. E.

doi:10.1111/j.1744-7348.1975.tb01625.x

Cited by 19 publications

(22 citation statements)

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“…In the early stages, the diseased tissue is light-brown, firm, and often has a distinct margin. In the advanced stages of corm rot, the decayed corm tissue may be invaded by Lasiodiplodia theobromae and turn black [14].…”

Section: Diseases Symptomsmentioning

confidence: 99%

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Taro Leaf Blight—A Threat to Food Security

Singh

Jackson²,

Hunter

et al. 2012

Agriculture

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Section: Diseases Symptomsmentioning

confidence: 99%

“…In addition to corm yield losses that occur as a consequence of the reduced leaf area [7] in diseased plants, a corm rot caused by P. colocasiae may also occur [5]. Under some circumstances the disease invades harvested corms and causes heavy losses during storage [14].…”

Section: Introductionmentioning

confidence: 99%

Taro Leaf Blight—A Threat to Food Security

Singh

Jackson²,

Hunter

et al. 2012

Agriculture

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“…Unfortunately, like most aroids, cocoyams have very short postharvest storage life of a few days to weeks (Gollifer & Boot, 1973; Jackson & Gollifer, 1975; Cecil, 1992; Ugwuanyi & Obeta, 1996, 1997). Differing and often conflicting reports have been made on the postharvest losses of cocoyams.…”

Section: Introductionmentioning

confidence: 99%

Moisture sorption isotherm and xerophilic moulds associated with dried cocoyam chips in storage in Nigeria

Ugwuanyi¹

2008

Int J of Food Sci Tech

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Extended storage of cocoyams (Colocasia antiquorum and Colocasia esculenta) is achieved in parts of Nigeria by processing them into smoked and dried chips. In this study, cocoyam chips were collected from parts of Nigeria at the end of drying, at various periods of storage and from markets, and analysed for moisture content, moisture sorption characteristics and xerophilic moulds. Moisture content of chips ranged from 7.07 ± 1.1% for freshly dried samples to 16 ± 2.2% for samples stored up to 8 months. Six mould species from four groups of the genus Aspergillus (including five xerophiles) identified as Aspergillus fumigatus, Eurotium repens, Eurotium amstelodami, Eurotium chevalieri and Aspergillus flavus and Aspergillus niger and Mucor sp. were isolated. The variety of moulds increased with storage and moisture content of samples. Moisture sorption in dried chips showed type II sigmoidal behaviour. Wood smoke significantly protected chips from mould colonization, but in cooperation with reduced water activity. Simple and inexpensive storage of freshly dried samples in airtight bags led to prolonged storage of up to 14 months without deterioration.

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“…This involves an approach which is opposite in principle to that which we would recommend for prolonging the storage life of taro corms. These resist Phyfophfhoru and Pyfhium rot better if they are stored in soil pits or polyethylene bags to encourage active vegetative growth (Jackson & Gollifer, 1975b;Jackson, Gollifer, Pinegar & Newhook, in press).…”

Section: Discussionmentioning

confidence: 99%

Survival of inoculum of the leaf blight fungus Phytophthora colocasiae infecting taro, Colocasia esculenta in the Solomon Islands

Gollifer¹,

Jackson²,

Newhook

1980

Annals of Applied Biology

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SUMMARY Phytophthora colocasiae was successfully isolated by baiting with detergent‐treated taro leaf discs 8 cm diameter placed on water slurries of soil, on suspensions of macerated infected leaf lesions or on the washings from petioles of harvested plants. Taro root tips, detached or left on corms, were not susceptible to zoospores of P. colocasiae nor were detached root tips of Lupinus angustifolius. Cubes of taro corm used as baits, and agar selective for Phycomycetes which was inoculated directly with soil, both became too heavily overrun by Phythium splendens to allow detection of P. colocasiae. Investigations indicated that inoculum on lesions of detached leaves and in soil remains viable for only a few days. Petiole bases which comprise the bulk of the ‘tops’ used for vegetative propagation, lost detectable natural inoculum rapidly (2 days) if stored dry, but less rapidly (14 days) if planted immediately in the field. Artifically augmenting surface inoculum with naturally produced sporangia considerably extended the periods of detectability, probably by increasing the chances that a few propagules would survive, especially during dry storage. Incubation of inoculated tops in high humidity led to active infection and sporulation on petioles, especially on cut ends, a situation that might be paralleled under suitable moisture conditions in the field. Of several aroid species tested by artificial inoculation only Alocasia macrorrhiza was susceptible. Natural infection of this plant has not been seen, making it an unlikely alternate host of P. colocasiae under field conditions. Thus perennation between taro crops is effected by shortlived surface propagules and possibly also by mycelium within lesions on petioles. Reduction of the former and prevention of the latter might be achieved by dry storage of tops for 2 to 3 wk.

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Storage rots of taro (Colocasia esculenta) in the British Solomon Islands

Cited by 19 publications

References 1 publication

Taro Leaf Blight—A Threat to Food Security

Taro Leaf Blight—A Threat to Food Security

Moisture sorption isotherm and xerophilic moulds associated with dried cocoyam chips in storage in Nigeria

Survival of inoculum of the leaf blight fungus Phytophthora colocasiae infecting taro, Colocasia esculenta in the Solomon Islands

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