Environmental Entomology (1995) 24, 1703-1707

Stefano Colazza and Ferdinando Bin (1995)
Efficiency of Trissolcus basalis (Hymenoptera: Scelionidae) as an egg parasitoid of Nezara viridula (Heteroptera: Pentatomidae) in central Italy
Environmental Entomology 24 (6), 1703-1707
Abstract: The natural control exerted by Trissolcus basalis (Wollaston), a solitary egg parasitoid of Nezara viridula (L.), in soybean fields in central Italy over 6 yr has been assessed. T. basalis was the only egg parasitoid attacking N. viridula egg masses. In total, 260 N. viridula egg masses were collected. Of these, 105 contained at least 1 egg parasitized by T. basalis. Approximately 20% of egg masses were parasitized during the first 2 yr (1986 and 1987), increasing to 50% in the following years (1988, 1990, 1991, and 1992). Parasitism efficiency (the percentage of eggs parasitized over the total egg masses discovered) was ~65% in 1986 and 1987, significantly less than in 1988 and 1990 (~92%). The impact of the parasitoid on the N. viridula population was low, <13%, for the first 2 yr, and much higher, ~40%, in the following years.
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Database assignments for author(s): Stefano Colazza

Research topic(s) for pests/diseases/weeds:
biocontrol - natural enemies
Research topic(s) for beneficials or antagonists:
general biology - morphology - evolution
surveys/distribution/isolation

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Nezara viridula	Soybean (Glycine max)	Italy
Trissolcus basalis (parasitoid)	Nezara viridula	Soybean (Glycine max)	Italy