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- W2189553721 abstract "The susceptibility of the various stages in a field population of the heart-shaped scale, Protopulvinaria pyriformis (Cockerell), to parasitoids was investigated at two-weekly intervals over a period of one year. Parasitism for the different instars varied, eg up to 70% parasitism was recorded in the adult female stage, whereas only 4% was recorded for the second instar. A 7% parasitism of the third instar occurred during the first generation (February) and 20% during the second generation (October). Up to 25% of all stages in the total population, except the first instar of the scale, were parasitised. The parasitoid species, probably Metaphycus galbus Annecke, M helvolus (Compere) and M stanleyi Compere, played a major role and were responsible for approximately 64% of the total parasitism in this study, while Coccophagus and Tetrastichus spp for the remainder." @default.
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- W2189553721 date "1991-01-01" @default.
- W2189553721 modified "2023-09-24" @default.
- W2189553721 title "Parasitoids of the Heart-Shaped (Pyriform) Scale. Protopulvinaria pyriformis (Cockerell) (Hemiptera: Coccidae) on Avocados in South Africa" @default.
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