Environmental Entomology (1984) 13, 439-443

R.C. Bautista, E.A. Heinrichs and R.S. Rejesus (1984)
Economic injury levels for the rice leaffolder Cnaphalocrocis medinalis (Lepidoptera: Pyralidae): Insect infestation and artificial leaf removal
Environmental Entomology 13 (2), 439-443
Abstract: Economic injury levels for the leaffolder Cnaphalocrosis medinalis Guenée on rice variety IR36 were determined as based on percentage of leaves damaged and on number of larvae per plant. The economic injury level based on larval density was indirectly estimated by measuring the yield loss at different levels of artificial defoliation and determining the number of larvae per plant required to cause a given percentage of defoliation. The established economic injury levels at the heading stage were 4.2% damaged leaves and 1.3 larva per plant.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Database assignments for author(s): Elvis Arden Heinrichs

Research topic(s) for pests/diseases/weeds:
damage/losses/economics
thresholds/decision-support systems

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Cnaphalocrocis medinalis	Rice (Oryza)	Philippines