Abstract
Hemp (Cannabis sativa L.) is a herbaceous annual grown mainly for its blast fiber and seed oil. In 1999, Health Canada issued licenses to plant 12,145 ha of hemp in Canada. Of these, 730 ha were in Alberta. During the last week of August, hemp plants (cv. Fasamo) in a central Alberta field showed the following symptoms and signs: wilting foliage turning light brown; dry tan to gray lesions on stems; shredding and breaking of stems at the lesion; presence of white mycelium in the lesion; and black round, irregular, or oblong sclerotia (up to 5 mm diameter and 2 to 11 mm long) present externally at the lesion on the stem and inside the pith cavity. Lesions were found at the crown, near the inflorescence, and along the entire stem length. Disease incidence in a survey of six commercial fields (40 ha) ranged from 1 to 8%. The organism isolated from lesions on potato dextrose agar produced white aerial mycelia and large numbers of sclerotia characteristic of Sclerotinia sclerotiorum. Pathogenicity was confirmed by inoculating 23-day-old greenhouse-grown hemp plants (cv. Fasamo) with autoclaved wheat grains colonized for 14 days with a S. sclerotiorum culture previously isolated from an infected hemp plant. The grains were placed on soilless growing medium near the plant and covered very lightly. One week after inoculation, grayish lesions appeared on the stems, white mycelia appeared on lesions, and plants wilted. The pathogen was reisolated from the lesions. This is the first report of S. sclerotiorum on hemp in Alberta, Canada. The disease known as hemp canker has been reported to cause severe losses under cool wet conditions in the Netherlands (1). Reference: (1) J. M. McPartland. J. Int. Hemp Assoc. 3:19, 1996.
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Claims 7
Claim · model-written summary
Hemp in a central Alberta field showed wilting, stem lesions, mycelium and sclerotia.
- Taxon
- hemp
Cannabis sativa subsp. sativae0 - Material
- cv. Fasamoe0
- Outcome
- wilting foliage turning light brown; dry tan to gray lesions on stems; shredding and breaking of stems at the lesion; presence of white mycelium in the lesion; and black round, irregular, or oblong sclerotiae0
- Setting
- central Alberta fielde0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“hemp plants (cv. Fasamo) in a central Alberta field showed the following symptoms and signs: wilting foliage turning light brown; dry tan to gray lesions on stems; shredding and breaking of stems at the lesion; presence of white mycelium in the lesion; and black round, irregular, or oblong sclerotia”
Claim · model-written summary
Lesions occurred across the stem, including the crown and near the inflorescence.
- Taxon
- HempCannabis sativa subsp. sativat0
- Organ / stage
- steme0
- Outcome
- Lesionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Lesions were found at the crown, near the inflorescence, and along the entire stem length.”
t0“Hemp Canker”
Claim · model-written summary
Hemp disease incidence ranged from 1 to 8% in six commercial fields.
- Taxon
- HempCannabis sativa subsp. sativat0
- Outcome
- Disease incidencee0
- Value
- 1 to 8%e0
- Setting
- six commercial fieldse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Disease incidence in a survey of six commercial fields (40 ha) ranged from 1 to 8%.”
t0“Hemp Canker”
Claim · model-written summary
The isolate from lesions produced mycelium and sclerotia characteristic of Sclerotinia sclerotiorum.
- Taxon
- HempCannabis sativa subsp. sativat0
- Interactor
- Sclerotinia sclerotiorum
Sclerotinia sclerotiorume0pathogen - Outcome
- Sclerotinia sclerotiorume0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The organism isolated from lesions on potato dextrose agar produced white aerial mycelia and large numbers of sclerotia characteristic of Sclerotinia sclerotiorum.”
t0“Hemp Canker”
Claim · model-written summary
Inoculated hemp developed stem lesions, mycelium and wilt after one week.
- Taxon
- hempCannabis sativa subsp. sativat0
- Treatment
- inoculatione0
- Outcome
- grayish lesions appeared on the stems, white mycelia appeared on lesions, and plants wiltede0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“One week after inoculation, grayish lesions appeared on the stems, white mycelia appeared on lesions, and plants wilted.”
t0“hemp”
Claim · model-written summary
The pathogen was reisolated from hemp lesions.
- Taxon
- HempCannabis sativa subsp. sativat0
- Outcome
- pathogen was reisolated from the lesionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The pathogen was reisolated from the lesions.”
t0“Hemp Canker”
Claim · model-written summary
The authors report Sclerotinia sclerotiorum on hemp in Alberta for the first time.
- Taxon
- hempCannabis sativa subsp. sativae0
- Interactor
- S. sclerotiorumSclerotinia sclerotiorume0pathogen
- Outcome
- first report of S. sclerotiorum on hempe0
- Setting
- Alberta, Canadae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This is the first report of S. sclerotiorum on hemp in Alberta, Canada.”
The same questions in other papers
inoculation · disease · Cannabis sativaPositive and negative results
4 papers in the same direction as this paper · 2 in the opposite direction
- positive
- positive
- negative
3 papers more in this group
See all 7 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.