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Megastigmus transvaalensis  Hussey (Hymenoptera: Torymidae) parasitizes drupes of  Rhus  genus plants in Africa and  Schinus  (Anacardiaceae) in South America. This exotic wasp damages  Schinus terebinthifolia  Raddi drupes in native forests and ecological restoration areas in Brazil. The objective of the present study was to investigate the precipitation, temperature and relative humidity effects on  M .  transvaalensis  flight activity, and to determine the parasitism rate and sex ratio of this wasp on  S .  terebinthifolia  plants. The study was conducted with yellow sticky traps and  S .  terebinthifolia  drupes collected in an ecological restoration area, from August 2014 to September 2015, in the Sorocaba municipality, São Paulo state, Brazil.  Megastigmus transvaalensis  populations were negatively correlated with maximum and minimum temperatures and precipitation, with population peaks at the end of May 2015, with 927 insects per evaluation (48.8 adults per trap). The  M .  transvaalensis  sex ratio was higher in the laboratory (0.42) than in the field (0.08). The parasitism rate of  S .  terebinthifolia  drupes by  M .  transvaalensis  ranged from zero to 36.3% under natural environmental conditions.  Megastigmus transvaalensis  can be monitored with yellow sticky traps. Damage by  M .  transvaalensis  in  S .  terebinthifolia  drupes may decrease the germination of the seeds and the establishment of this plant in native and restoration ecological areas.

Megastigmus seed wasp damage on native Schinus terebinthifolia drupes in ecological restoration area in Brazil