Journal of Entomology (2007) 4, 457-462

Sevilor Kekeunou, Stephan Weise and Jean Messi (2007)
Abundance of Zonocerus variegatus (L.) (Orthoptera: Pyrgomorphidae) in the natural herbaceous fallow and planted forest: Effect of Chromolaena odorata (Asteraceae)
Journal of Entomology 4 (6), 457-462
Abstract: This study assesses the abundance of Zonocerus variegatus in 2 natural herbaceous fallow and 2 planted forest types of the forest reserve of Mbalmayo (Cameroon) with the aim of testing the hypothesis that the high abundance of the grasshopper is linked to the presence of C. odorata. In each of 3 replications of each treatment, we carried out once every 14 days (from February, 2002 to December, 2003), regular collection and observation with sweep netting for a period of 30 mn. The results showed that, Z. variegatus is found in herbaceous fallows, but is extremely rare in the Inga edulis planted fallow. Within natural herbaceous fallows, it is significantly more abundant in those with, than in those without C. odorata, only in the dry season. No individuals were observed in the type I planted forest (without C. odorata) while 0.29 individuals were captured in the type II (with C. odorata). These data suggest that the type of vegetation has an important effect on Z. variegatus abundance.
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Database assignments for author(s): Sévilor Kekeunou

Research topic(s) for pests/diseases/weeds:
environment - cropping system/rotation

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Zonocerus variegatus		Cameroon
	Chromolaena odorata (weed)		Cameroon