Abstract
Onion (Allium cepa L) is one of the most important vegetable crops worldwide considering area and production. During the year 2009 a high incidence of field dodder (Cuscuta campestris Yuncker) was observed for the first time in fields sown with onion in the southern block of the Gezira Scheme. The objectives of this research were to determine the natural host range, and to evaluate the effects of field dodder infection on 3 different cultivars of onion, namely, local red, yellow, and white as well as to confirm the susceptibility of onion to field dodder parasitism. Surveys were conducted in onion and other vegetables growing fields to determine the natural host range of field dodder. The experiments were conducted at the demonstration farm of the Faculty of Agriculture and Natural Resources, University of Gezira, Wad Medani, Sudan in two seasons in 2010-2011 using complete randomized block design with 4 replicates. The impact of dodder on the onion traits; bulb fresh weight, bulb diameter and number of bulbs/m² were assessed for each onion cultivar. Field dodder was found parasitizing 19 plant species belonging to 12 families. Among the most affected hosts, were 5 vegetable crops (onion, tomato, chickpeas, jews mallow and salad rocket), and one fruit tree (lime). Dodder infection weakened onion plants, reduced the yield and did not allow the bulbs to reach marketable size. Field dodder significantly reduced onion bulb fresh weight, bulb diameter and number of bulbs/m² of the 3 onion cultivars by 47.4% - 57.7% and 33% - 44%, and 29% - 52% respectively. These findings confirmed the susceptibility of onion to field dodder infestation. In conclusion, field dodder (C. campestris) is a nonspecific parasite that attacks, sometimes simultaneously a wide range of host species. It could be considered as a troublesome parasitic weed on onion (Allium cepa) in Gezira State.
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Claims 8
Claim · model-written summary
Field dodder parasitized 19 species from 12 families.
- Taxon
- plant speciese0
- Interactor
- Field dodder
Cuscuta campestrise0parasite - Outcome
- parasitizinge0
- Value
- 19 plant species belonging to 12 familiese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Field dodder was found parasitizing 19 plant species belonging to 12 families.”
Claim · model-written summary
Five vegetable crops and lime were among the most affected hosts.
Verbatim
e0“Among the most affected hosts, were 5 vegetable crops (onion, tomato, chickpeas, jews mallow and salad rocket), and one fruit tree (lime).”
Claim · model-written summary
Dodder infection weakened onion plants.
- Taxon
- onion
Allium cepae0 - Treatment
- Dodder infectione0
- Interactor
- Doddere0parasite
- Outcome
- onion plantse0
- Direction
- weakenede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Dodder infection weakened onion plants”
t0“onion (Allium cepa L.)”
Claim · model-written summary
Dodder infection reduced onion yield.
- Taxon
- onionAllium cepae0
- Treatment
- Dodder infectione0
- Interactor
- Doddere0parasite
- Outcome
- yielde0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Dodder infection weakened onion plants, reduced the yield and did not allow the bulbs to reach marketable size.”
Claim · model-written summary
Dodder infection prevented bulbs reaching marketable size.
- Taxon
- onionAllium cepat0
- Treatment
- Dodder infectione0
- Interactor
- Doddere0parasite
- Outcome
- bulbs to reach marketable sizee0
- Direction
- did not allowe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Dodder infection weakened onion plants, reduced the yield and did not allow the bulbs to reach marketable size.”
t0“onion (Allium cepa L.)”
Claim · model-written summary
Dodder reduced onion bulb fresh weight by 47.4%–57.7%.
- Taxon
- onionAllium cepae0
- Treatment
- Field doddere0
- Interactor
- Field dodderCuscuta campestrise0parasite
- Outcome
- bulb fresh weighte0
- Direction
- reducede0
- Value
- 47.4% - 57.7%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Field dodder significantly reduced onion bulb fresh weight, bulb diameter and number of bulbs/m² of the 3 onion cultivars by 47.4% - 57.7% and 33% - 44%, and 29% - 52% respectively.”
Claim · model-written summary
Dodder reduced onion bulb diameter by 33%–44%.
- Taxon
- onionAllium cepae0
- Treatment
- Field doddere0
- Interactor
- Field dodderCuscuta campestrise0parasite
- Outcome
- bulb diametere0
- Direction
- reducede0
- Value
- 33% - 44%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Field dodder significantly reduced onion bulb fresh weight, bulb diameter and number of bulbs/m² of the 3 onion cultivars by 47.4% - 57.7% and 33% - 44%, and 29% - 52% respectively.”
Claim · model-written summary
Dodder reduced onion bulb number by 29%–52%.
- Taxon
- onionAllium cepae0
- Treatment
- Field doddere0
- Interactor
- Field dodderCuscuta campestrise0parasite
- Outcome
- number of bulbs/m²e0
- Direction
- reducede0
- Value
- 29% - 52%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Field dodder significantly reduced onion bulb fresh weight, bulb diameter and number of bulbs/m² of the 3 onion cultivars by 47.4% - 57.7% and 33% - 44%, and 29% - 52% respectively.”
The same questions in other papers
infection · yield · Allium cepa (onion)Positive and negative results
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See all 8 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.