Abstract
Abstract Disease progress of late leafspot of peanut caused by Cercosporidium personatum was monitored on the variety ‘Florunner’ in unsprayed plots and in plots sprayed weekly with chlorothalonil (343 μg active ingredient/ml H2O). The canopy was divided into three vertical semicircular leaf layers, each 15 cm high. Proportions of visible disease (xv) and defoliation (d) per leaf layer were estimated with a modified Horsfall-Barratt rating system. Total disease (xt) in each leaf layer and per plant were calculated with the equation xt = [(1-d)* xv + d]. Apparent infection rates (sensu Vanderplank) were calculated for xv, d, and xt in each leaf layer and for the total plant canopy. Rates of disease increase and defoliation on sprayed and unsprayed tissue were not significantly different (P = 0.05). Disease severity in plots sprayed with chlorothalonil usually lagged three to five days behind disease in unsprayed plots. The disease components, xv, d, and xt were greatest in the bottom canopy layer. The rate of defoliation in the top leaf layer of unsprayed plots was significantly slower (P = 0.05) than that in the other two leaf layers, possibly because of dilution by the new plant growth. Chlorothalonil sprays reduced initial disease but did not reduce the rate of increase of C. personatum.
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Claims 6
Claim · model-written summary
Disease increase and defoliation rates did not differ significantly between sprayed and unsprayed peanut tissue.
- Taxon
- peanut
Arachis hypogaeae0t0 - Treatment
- sprayede0
- Interactor
- Cercosporidium personatumNothopassalora personatae0t1pathogen
- Outcome
- disease increase and defoliatione0
- Direction
- not significantly differente0
- Comparator
- unsprayed tissuee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Rates of disease increase and defoliation on sprayed and unsprayed tissue were not significantly different (P = 0.05).”
t0“Peanut”
t1“Cercosporidium personatum”
Claim · model-written summary
Disease severity in chlorothalonil-sprayed plots lagged unsprayed plots by three to five days.
- Taxon
- peanutArachis hypogaeae0t0
- Treatment
- chlorothalonile0
- Outcome
- Disease severitye0
- Direction
- laggede0
- Value
- three to five dayse0
- Comparator
- unsprayed plotse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Disease severity in plots sprayed with chlorothalonil usually lagged three to five days behind disease in unsprayed plots.”
t0“Peanut”
Claim · model-written summary
Visible disease, defoliation and total disease were greatest in the bottom peanut canopy layer.
- Taxon
- peanutArachis hypogaeae0t0
- Organ / stage
- bottom canopy layere0
- Outcome
- disease components, xv, d, and xte0
- Direction
- greateste0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The disease components, xv, d, and xt were greatest in the bottom canopy layer.”
t0“Peanut”
Claim · model-written summary
Defoliation in the top layer of unsprayed peanut plants progressed more slowly than in the two lower layers.
- Taxon
- peanutArachis hypogaeae0t0
- Organ / stage
- top leaf layere0
- Outcome
- rate of defoliatione0
- Direction
- significantly slowere0
- Comparator
- other two leaf layerse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The rate of defoliation in the top leaf layer of unsprayed plots was significantly slower (P = 0.05) than that in the other two leaf layers”
t0“Peanut”
Claim · model-written summary
Chlorothalonil sprays reduced initial peanut late leafspot disease.
- Taxon
- peanutArachis hypogaeae0t0
- Treatment
- Chlorothalonil sprayse0
- Outcome
- initial diseasee0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Chlorothalonil sprays reduced initial disease”
t0“Peanut”
Claim · model-written summary
Chlorothalonil sprays did not reduce the rate of increase of C. personatum.
- Taxon
- peanutArachis hypogaeae0t0
- Treatment
- Chlorothalonil sprayse0
- Interactor
- C. personatumNothopassalora personatae0pathogen
- Outcome
- rate of increase of C. personatume0
- Direction
- did not reducee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Chlorothalonil sprays reduced initial disease but did not reduce the rate of increase of C. personatum.”
t0“Peanut”
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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.