Paper · 1954 · Japanese Journal of Phytopathology

On the scala for estimating degree of severity of Sheath blight by Hypochnus Sasakii SHIRAI in rice plant

Shoji YOSHIMURA

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Open access

Abstract

For estimating the degree of damage of the rice plants affected with sheath blight (Hyp. Sasakii Shirai), following formula has been proposed.Degree of severity(%)=3n1+2n2+1n3+0n4/3N×100where, N=n1+n2+n3+n4: n1…number of stems having affected upper leafsheaths up to the top leaf: n2…number of stems having blighted upper leafsheaths except the top leafsheath: n3…number of stems having blighted leafsheaths except uppermost 2 leafsheath: n4…number of stems having the 4 uppermost leafsheaths healthy.

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Claims 1

Method / resourceobservedoriginal resultbasis n/a

Claim · model-written summary

A formula is proposed for the degree of severity (%) of rice sheath blight.

Interactor
Hyp. Sasakii Shiraie0pathogen
Outcome
Degree of severity(%)e1
Value
3N×100e1

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

Oryza sativa
Oryza sativa · Taxon · picture from its Wikimedia Commons categoryDesmanthus4food · CC BY-SA 3.0 us · Wikimedia Commons ↗

Verbatim

e0

“For estimating the degree of damage of the rice plants affected with sheath blight (Hyp. Sasakii Shirai)”

✓ located verbatim in the source · abstract, characters 0–104 · show in text ↑
e1

“Degree of severity(%)=3n1+2n2+1n3+0n4/3N×100”

✓ located verbatim in the source · abstract, characters 142–186 · show in text ↑