Pacific Pests & Pathogens - Mini Fact Sheet Edition
Tomato late blight (261)
- Wordwide distribution. On tomato, potato and wild species in the potato family. There is evidence of strains attacking different hosts. An important disease.
- A water mould, or oomycete, not a fungus.
- Irregular patches on leaves; white cottony growth with spores on undersides. Leaves yellow, shrivel and fall. Dark brown, firm fruit rot. Worse in cool, wet weather.
- Spread by wind or wind-driven rain, up to 20 km; and on seed for planting.
- Cultural control: check plants in nursery; avoid planting near older plants; space plants to aid air movement; intercrop; stake; mulch; drip rather than overhead irrigation; tolerant varieties; crop rotation.
- Chemical control: copper, mancozeb or chlorothalonil, alone, or alternate with, e.g., metalaxyl, cymoxanil, dimethomorth or strobilurins. Phosphorus acid either alone or with chlorothalonil.
Tomato late blight, potato late blight
Scientific NamePhytophthora infestans
AUTHOR Grahame Jackson
Information from CABI (2015) Phytophthora infestans (Phytophthora blight) Crop Protection Compendium. (www.cabi.org/cpc).
Produced with support from the Australian Centre for International Agricultural Research under project PC/2010/090: Strengthening integrated crop management research in the Pacific Islands in support of sustainable intensification of high-value crop production, implemented by the University of Queensland and the Secretariat of the Pacific Community.
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