Pacific Pests, Pathogens, Weeds & Pesticides - Online edition

Pacific Pests, Pathogens, Weeds & Pesticides

Talo Pala – Mae’a o seleselega (Taro corm rots – post-harvest) (179)

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Photo 1. The dry white crumbly rot at the bottom of the corm is caused by Pythium splendens. The pinkish tissues above and slightly to the right are a reaction to infection by the corm tissues. The white semi-circle on the left is the cottony growth of Athelia rofsii.

Photo 2. Light brown firm rot caused by Phytophthora colocasiae. The rot on the lower left side is caused by Athelia rolfsii. The corm has been incubated at high humidity overnight to stimulate the growth of the fungus.

Photo 3. Light brown firm rot in a taro corm caused by Phytophthora colocasiae, after about 8 days.

Aotelega

  • Maua I atunu’u mafanafana ma aafia ai le tele o ituaiga laau. Se faama’I taua.
  • Figi, limu vai (oomycetes) ma siama e mafua ai le pala. E ulu atu I manua o le talo mai le taimi o seleselega. O foliga vaaia mai faamai o: (i) Athelia - e piniki totonu ae li’o pa'epa'e autafa; (ii) Pythium – pala pa'epa'e; (iii) Phytophthora lau talo pala – pala enaena maopopo; (iv) Lasiodiplodia - uliuli, omomi, pala le manogi; ma (v) Erwinia- pala vaivai.
  • Metotia Fa'aleaganu'u: selesele, aveese lauvai ma palapala, ma teu i totonu o le (i) lua laula'au, po'o (ii) taga pepa iila po'o (iii) atigipusa pepa, pe a fafai mo maketi.
  • Faaogaina o vaila'au: faatofu I se vailaau (clorox) (1% mo le 1-2minute), faamago ma teu i taga palasitika).

Igoa masani: Talo pala (pe a uma le seleselega).

Igoa Faasaienisi: O faamai nei ua  fa'amauina e tupu a'e i talo pe a uma ona selesele:

Athelia rolfsii (va'ai Fa'amatalaga Fa'amatalaga nu. 11)
Lasiodiplodia (Botryodiplodia) theobromae
Pythium splendens
Phytophthora colocasiae (silasila i Fa'amatalaga Fa'amatalaga nu. 14)
Erwinia ituaiga: Erwinia ca rot ovora subsp. Ca rot ovora (tagai i le Pepa Faamatalaga Nu. 101, 214, 289, 296); ua toe faaigoa nei Pectobacterium ca rot ovorum subsp. Ca rot ovorum, ma Erwinia crysanthemi.

Photo 4. Black spongy rot caused by Lasiodiplodia theobromae. These rots usually follow those of Pythium and Phytophthora, or they come in later after the corms have started to lose moisture.

Photo 5. These two corms have been in a plastic bag for 4 weeks; the one on the left is still healthy whereas the one on the right has been destroyed by the soft rot bacterium, Erwinia chrysanthemi.

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