Entomologia Sinica (1995) 2, 353-364

Weimin Fan, Hongchang Li and Xinghui Qiu (1995)
Estimation of economic thresholds for grasshopper damage on grazing pasture in the typical steppe of China
Entomologia Sinica 2 (4), 353-364
Abstract: Almost all of the methods traditionally selected to estimate forage damage caused by grasshoppers in grassland are to determine the forage damage in relation to forage yield in fall. But the damage to standing forage, not the forage yields in fall, should be considered in determining forage damage and economic thresholds in grazing pasture. A new method that combines the field hang-cage rearing with natural grasshopper population dynamics to evaluate the damage to standing forage was presented in this paper. The complex grasshoppers economic threshold models in grazing pasture can be described as:
a₀+ a ₁ M ₁ + a ₂ M ₂+a3S1+a4S2= C
Where M₁: biomass of Myrmeleotettix palpalis (Zub.); M2: biomass of Chorthippus dubius (Zub); S1: average individual weight of My. palpalis; S2: average individual weight of Ch. dubius, a0-a4: constants. The level of grasshopper's infestation was described with regard to both grasshopper density and phenology.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Link to article at publishers website
Database assignments for author(s): Xinghui Qiu

Research topic(s) for pests/diseases/weeds:
damage/losses/economics

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Myrmeleotettix palpalis	Grasses/turf/rangeland
	Chorthippus dubius	Grasses/turf/rangeland