Anthracnose – Colletotrichum spp. is the pest of the month at Your Levy at Work. Below is some information about this common nursery pathogen.
Symptoms
Symptoms vary with host, but spots often initially appear as small water-soaked circular lesions on leaves, stems or fruit. With time, spots enlarge and become tan to dark brown or black in colour. Sometimes leaf spots may be surrounded by a bright yellow halo. Lesions may become sunken and produce concentric bands of tiny black fruiting bodies on the dead tissue in the centre of spots. Salmon-coloured spore masses may exude from fruiting bodies under conditions of high humidity.
Transmission
Sowing contaminated seed is the most common means of introducing the pathogen. Spores are spread by water splash from rain and overhead irrigation. The fungi may survive on undecomposed plant residues in the soil or on numerous alternative crop and weed hosts. Spores spread rapidly during wet, humid windy weather.
Favoured by
These pathogens favour warm, humid, wet conditions. The pathogen can survive on the leaf surface until conditions are favourable for infection and disease development through stomata or wound. As free moisture is required for infection, avoid wet foliage, particularly during warm weather. Plants can be very susceptible during mist propagation.
Host range
This fungi is found on a very wide range of hosts including azalea, cyclamen, orchid, pansy, palms, snapdragon, violet, zinnia, protea, rose, ivy, croton, Dieffenbachia, Cordyline, Dracaena, Ficus, and food crops such as rockmelon, cucumber, strawberry, capsicum, papaya, avocado. It is also found on weed species such as Noogoora burr (Xanthium pungens) and Bathurst burr (Xanthium spinosum).
Source: Your Levy at Work
Announcements
Vacancies
- Technical Sales Representative, Leamington, Ontario
- Technical Sales Representative, Ancaster, Ontario
- HR Generalist
- Head Grower Strawberries (West Virginia USA)
- Global Sourcing Manager
- Buying Operations Manager (BOM Process)
- Sourcing Manager EU
- Manager Operations Ethiopia
- Manager Operations Ethiopia
- Senior Grower
"Tweeting Growers"
Top 5 - yesterday
- “With our placement in Türkiye, we have easy access to the rest of the world”
- Dutch growers lose faith
- Australia: Ball Mother-stock House meets growing demands
- "When buying our products, not only the rose production will be supported, also the well-being of rescued wildlife"
- "New substrate fiber fits into the future of cultivation"
Top 5 - last week
Top 5 - last month
- Hasfarm’s network expands in Indonesia, partnering with Bromelia Flowers and Tropika
- "Breeders need to study the Chinese market carefully before introducing a variety"
- Royal Flowers merges with The Elite Group
- North America: “Unbridled optimism for Mother’s Day tempered by reality”
- “A new sales channel for flower companies without any labor or high fixed costs”
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Other news in this sector:
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- 2023-05-23 Combatting invasive species through action
- 2023-05-18 UK: Defra announces plant health research and development plan
- 2023-05-18 New generation Mycotal released
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- 2023-05-17 US (CA): Dept of Pesticide Regulation awards $3,15M in research grants
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- 2023-05-16 US: Downy mildew observed on a greenhouse in Massachusetts
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- 2023-05-05 Biobest signs letter to acquire BioWorks
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