Paper · 1981 · Tropical Pest Management

Chemical Control of Basal Rot of Onion in Zambia

D. M. Naik; O. J. Burden

16
claims
32
verbatim quotes
12
citations
2
research areas
—
Not open access

Abstract

Abstract In a commercial planting of onion, root and basal rots reduced establishment of sets to 44%, which with 30% basal rot in harvested bulbs, represented an overall numerical loss of potential yield of 69%. Fusarium oxysporum, already present in sets at planting, contributed to poor establishment. Isolation from seedlings grown for sets in virgin soil at three locations yielded infection rates of 80 to 90%. In two field trials to evaluate fungicide treatments mean establishment was 47%. In the first trial involving dusting of the sets before planting Granosan 200 (benomyl 15% + mancozeb 60%) increased establishment by 28%, reduced basal rot of harvested bulbs by 77% and increased yield by 106%. Benomyl decreased basal rot and increased yields but captan and thiram treatments were ineffective. When bulbs from this trial were stored for six weeks under ambient conditions losses were 94% in controls and 45% in the benomyl + mancozeb treatment, with losses from other treatments intermediate. In the second trial, using pre-planting dips of benomyl the optimum concentration/time of 100 μ/ml for 15 min, reduced basal rot by 65% and increased yield 54%.

Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. Read at the source ↗

The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.

Claims 16

Observationobservedoriginal resultnegativemeasured

Claim · model-written summary

Root and basal rots reduced establishment to 44%.

Taxon
onionAllium cepat0
Outcome
establishment of setse0
Direction
reducede0
Value
44%e0

Organisms pictured · Representative pictures of the matched species, not figures from the paper.

Allium cepa
Allium cepa · TaxonMehdi · CC BY-SA 3.0 · Wikimedia Commons ↗

Verbatim

e0

“root and basal rots reduced establishment of sets to 44%”

✓ located verbatim in the source · abstract, characters 44–100 · show in text ↑
t0

“onion”

✓ located after whitespace/quote normalisation · title, characters 33–38 · show in text ↑
Observationobservedoriginal resultnegativemeasured

Claim · model-written summary

Basal rot affected 30% of harvested bulbs.

Taxon
onionAllium cepat0
Outcome
basal rot in harvested bulbse0
Value
30%e0

Organisms pictured · Representative pictures of the matched species, not figures from the paper.

Allium cepa
Allium cepa · TaxonMehdi · CC BY-SA 3.0 · Wikimedia Commons ↗

Verbatim

e0

“30% basal rot in harvested bulbs”

✓ located verbatim in the source · abstract, characters 113–145 · show in text ↑
t0

“onion”

✓ located after whitespace/quote normalisation · title, characters 33–38 · show in text ↑
Observationobservedoriginal resultnegativemeasured

Claim · model-written summary

The combined rots caused 69% numerical loss of potential yield.

Taxon
onionAllium cepat0
Outcome
loss of potential yielde0
Value
69%e0

Organisms pictured · Representative pictures of the matched species, not figures from the paper.

Allium cepa
Allium cepa · TaxonMehdi · CC BY-SA 3.0 · Wikimedia Commons ↗

Verbatim

e0

“overall numerical loss of potential yield of 69%”

✓ located verbatim in the source · abstract, characters 162–210 · show in text ↑
t0

“onion”

✓ located after whitespace/quote normalisation · title, characters 33–38 · show in text ↑
Mechanismauthor interpretationoriginal resultnegativemeasured

Claim · model-written summary

Fusarium oxysporum in sets contributed to poor establishment.

Taxon
onionAllium cepat0
Interactor
Fusarium oxysporumFusarium oxysporume0pathogen
Outcome
poor establishmente0

Organisms pictured · Representative pictures of the matched species, not figures from the paper.

Allium cepa
Allium cepa · TaxonMehdi · CC BY-SA 3.0 · Wikimedia Commons ↗
Fusarium oxysporum
Fusarium oxysporum · InteractorClemson University - USDA Cooperative Extension Slide Series · CC BY 3.0 · Wikimedia Commons ↗

Verbatim

e0

“Fusarium oxysporum, already present in sets at planting, contributed to poor establishment”

✓ located verbatim in the source · abstract, characters 212–302 · show in text ↑
t0

“onion”

✓ located after whitespace/quote normalisation · title, characters 33–38 · show in text ↑
Observationobservedoriginal resultnegativemeasured

Claim · model-written summary

Seedlings grown for sets had 80 to 90% infection across three virgin-soil sites.

Taxon
onionAllium cepat0
Outcome
infection ratese0
Value
80 to 90%e0
Qualifier
three locationse0

Organisms pictured · Representative pictures of the matched species, not figures from the paper.

Allium cepa
Allium cepa · TaxonMehdi · CC BY-SA 3.0 · Wikimedia Commons ↗

Verbatim

e0

“Isolation from seedlings grown for sets in virgin soil at three locations yielded infection rates of 80 to 90%”

✓ located verbatim in the source · abstract, characters 304–414 · show in text ↑
t0

“onion”

✓ located after whitespace/quote normalisation · title, characters 33–38 · show in text ↑
Observationobservedoriginal resultmeasured

Claim · model-written summary

Mean establishment in two field trials was 47%.

Taxon
onionAllium cepat0
Outcome
mean establishmente0
Value
47%e0
Setting
field trialse0

Organisms pictured · Representative pictures of the matched species, not figures from the paper.

Allium cepa
Allium cepa · TaxonMehdi · CC BY-SA 3.0 · Wikimedia Commons ↗

Verbatim

e0

“In two field trials to evaluate fungicide treatments mean establishment was 47%”

✓ located verbatim in the source · abstract, characters 416–495 · show in text ↑
t0

“onion”

✓ located after whitespace/quote normalisation · title, characters 33–38 · show in text ↑
Intervention effectobservedoriginal resultpositivemeasured

Claim · model-written summary

Granosan 200 dust increased establishment by 28%.

Taxon
onionAllium cepat0
Treatment
Granosan 200 (benomyl 15% + mancozeb 60%)e0
Outcome
establishmente0
Direction
increasede0
Value
28%e0

Not reportedComparator

Organisms pictured · Representative pictures of the matched species, not figures from the paper.

Allium cepa
Allium cepa · TaxonMehdi · CC BY-SA 3.0 · Wikimedia Commons ↗

Verbatim

e0

“Granosan 200 (benomyl 15% + mancozeb 60%) increased establishment by 28%”

✓ located verbatim in the source · abstract, characters 562–634 · show in text ↑
t0

“onion”

✓ located after whitespace/quote normalisation · title, characters 33–38 · show in text ↑
Intervention effectobservedoriginal resultpositivemeasured

Claim · model-written summary

Granosan 200 dust reduced basal rot by 77%.

Taxon
onionAllium cepat0
Treatment
Granosan 200 (benomyl 15% + mancozeb 60%)e0
Outcome
basal rot of harvested bulbse0
Direction
reducede0
Value
77%e0

Not reportedComparator

Organisms pictured · Representative pictures of the matched species, not figures from the paper.

Allium cepa
Allium cepa · TaxonMehdi · CC BY-SA 3.0 · Wikimedia Commons ↗

Verbatim

e0

“Granosan 200 (benomyl 15% + mancozeb 60%) increased establishment by 28%, reduced basal rot of harvested bulbs by 77%”

✓ located verbatim in the source · abstract, characters 562–679 · show in text ↑
t0

“onion”

✓ located after whitespace/quote normalisation · title, characters 33–38 · show in text ↑
Intervention effectobservedoriginal resultpositivemeasured

Claim · model-written summary

Granosan 200 dust increased yield by 106%.

Taxon
onionAllium cepat0
Treatment
Granosan 200 (benomyl 15% + mancozeb 60%)e0
Outcome
yielde0
Direction
increasede0
Value
106%e0

Not reportedComparator

Organisms pictured · Representative pictures of the matched species, not figures from the paper.

Allium cepa
Allium cepa · TaxonMehdi · CC BY-SA 3.0 · Wikimedia Commons ↗

Verbatim

e0

“Granosan 200 (benomyl 15% + mancozeb 60%) increased establishment by 28%, reduced basal rot of harvested bulbs by 77% and increased yield by 106%”

✓ located verbatim in the source · abstract, characters 562–707 · show in text ↑
t0

“onion”

✓ located after whitespace/quote normalisation · title, characters 33–38 · show in text ↑
Intervention effectobservedoriginal resultpositivemeasured

Claim · model-written summary

Benomyl decreased basal rot and increased yields.

Taxon
onionAllium cepat0
Treatment
Benomyle0
Outcome
basal rote0
Direction
decreasede0

Not reportedComparator

Organisms pictured · Representative pictures of the matched species, not figures from the paper.

Allium cepa
Allium cepa · TaxonMehdi · CC BY-SA 3.0 · Wikimedia Commons ↗

Verbatim

e0

“Benomyl decreased basal rot and increased yields”

✓ located verbatim in the source · abstract, characters 709–757 · show in text ↑
t0

“onion”

✓ located after whitespace/quote normalisation · title, characters 33–38 · show in text ↑
Intervention effectobservedoriginal resultpositivemeasured

Claim · model-written summary

Benomyl increased yields.

Taxon
onionAllium cepat0
Treatment
Benomyle0
Outcome
yieldse0
Direction
increasede0

Not reportedComparator

Organisms pictured · Representative pictures of the matched species, not figures from the paper.

Allium cepa
Allium cepa · TaxonMehdi · CC BY-SA 3.0 · Wikimedia Commons ↗

Verbatim

e0

“Benomyl decreased basal rot and increased yields”

✓ located verbatim in the source · abstract, characters 709–757 · show in text ↑
t0

“onion”

✓ located after whitespace/quote normalisation · title, characters 33–38 · show in text ↑
Intervention effectobservedoriginal resultno effectmeasured

Claim · model-written summary

Captan treatment was ineffective.

Taxon
onionAllium cepat0
Treatment
captane0
Outcome
ineffectivee0
Direction
ineffectivee0

Not reportedComparator

Organisms pictured · Representative pictures of the matched species, not figures from the paper.

Allium cepa
Allium cepa · TaxonMehdi · CC BY-SA 3.0 · Wikimedia Commons ↗

Verbatim

e0

“captan and thiram treatments were ineffective”

✓ located verbatim in the source · abstract, characters 762–807 · show in text ↑
t0

“onion”

✓ located after whitespace/quote normalisation · title, characters 33–38 · show in text ↑
Intervention effectobservedoriginal resultno effectmeasured

Claim · model-written summary

Thiram treatment was ineffective.

Taxon
onionAllium cepat0
Treatment
thirame0
Outcome
ineffectivee0
Direction
ineffectivee0

Not reportedComparator

Organisms pictured · Representative pictures of the matched species, not figures from the paper.

Allium cepa
Allium cepa · TaxonMehdi · CC BY-SA 3.0 · Wikimedia Commons ↗

Verbatim

e0

“captan and thiram treatments were ineffective”

✓ located verbatim in the source · abstract, characters 762–807 · show in text ↑
t0

“onion”

✓ located after whitespace/quote normalisation · title, characters 33–38 · show in text ↑
Intervention effectobservedoriginal resultpositivemeasured

Claim · model-written summary

After six weeks storage, controls lost 94% of bulbs versus 45% with benomyl plus mancozeb.

Taxon
onionAllium cepat0
Treatment
benomyl + mancozeb treatmente0
Outcome
lossese0
Value
45%e0
Qualifier
94%e0
Comparator
controlse0

Not reportedDirection

Organisms pictured · Representative pictures of the matched species, not figures from the paper.

Allium cepa
Allium cepa · TaxonMehdi · CC BY-SA 3.0 · Wikimedia Commons ↗

Verbatim

e0

“losses were 94% in controls and 45% in the benomyl + mancozeb treatment”

✓ located verbatim in the source · abstract, characters 887–958 · show in text ↑
t0

“onion”

✓ located after whitespace/quote normalisation · title, characters 33–38 · show in text ↑
Intervention effectobservedoriginal resultpositivemeasured

Claim · model-written summary

A 100 μ/ml benomyl dip for 15 min reduced basal rot by 65%.

Taxon
onionAllium cepat0
Treatment
100 μ/ml for 15 mine0
Outcome
basal rote0
Direction
reducede0
Value
65%e0

Not reportedComparator

Organisms pictured · Representative pictures of the matched species, not figures from the paper.

Allium cepa
Allium cepa · TaxonMehdi · CC BY-SA 3.0 · Wikimedia Commons ↗

Verbatim

e0

“100 μ/ml for 15 min, reduced basal rot by 65%”

✓ located verbatim in the source · abstract, characters 1098–1143 · show in text ↑
t0

“onion”

✓ located after whitespace/quote normalisation · title, characters 33–38 · show in text ↑
Intervention effectobservedoriginal resultpositivemeasured

Claim · model-written summary

A 100 μ/ml benomyl dip for 15 min increased yield by 54%.

Taxon
onionAllium cepat0
Treatment
100 μ/ml for 15 mine0
Outcome
yielde0
Direction
increasede0
Value
54%e0

Not reportedComparator

Organisms pictured · Representative pictures of the matched species, not figures from the paper.

Allium cepa
Allium cepa · TaxonMehdi · CC BY-SA 3.0 · Wikimedia Commons ↗

Verbatim

e0

“100 μ/ml for 15 min, reduced basal rot by 65% and increased yield 54%”

✓ located verbatim in the source · abstract, characters 1098–1167 · show in text ↑
t0

“onion”

✓ located after whitespace/quote normalisation · title, characters 33–38 · show in text ↑

mancozeb · yield · Allium cepa (onion)Results differ

10 papers: 9 positive, 1 negative or no effect

8 papers in the same direction as this paper · 1 in the opposite direction

  1. no effect
  2. positive
  3. positive

6 papers more in this group

See all 10 papers →

mancozeb · growth · Allium cepa (onion)Positive and negative results

4 papers: 3 positive, 1 negative or no effect

2 papers in the same direction as this paper · 1 in the opposite direction

  1. negative
  2. positive
  3. positive
See all 4 papers →

benomyl · growth · Allium cepa (onion)Positive and negative results

4 papers: 1 positive, 3 negative or no effect

3 in the opposite direction

  1. no effect
  2. negative
  3. negative
See all 4 papers →

benomyl · disease · Allium cepa (onion)Results agree

5 papers: 5 positive, 0 negative or no effect

4 papers in the same direction as this paper

  1. positive
  2. positive
  3. positive

1 paper more in this group

See all 5 papers →

mancozeb · disease · Allium cepa (onion)Results agree

12 papers: 12 positive, 0 negative or no effect

11 papers in the same direction as this paper

  1. positive
  2. positive
  3. positive

8 papers more in this group

See all 12 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.