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Articles by E. Grafius
Total Records ( 2 ) for E. Grafius
  Idris, A. B. and E. Grafius
  Diadegma insulare (Cresson), a parasitoid of diamondback moth (DBM), Plutella xylostella L., caught per sticky traps were used to indicate the presence of parasitoid in the habitats. The numbers of D. insulare caught were significantly different among habitats in 1993 and 1994. The parasitoid adults were caught in most habitats (crop or non-crop) except in the woodland’s centers and weedy areas with > 90% Agropyron repen (L.) or Asteraceae plus grasses as the majority of plants present. D. insulare is highly mobile and prefers to visit or stay longer in the habitats that have Daucus carota L. or wild Brassica species. These two weed species provided food sources or refuge for both parasitoid and its host (DBM). However, shelter of woodland edge with D. carota as the majority of plant presence attracted the highest numbers of D. insulare. Presence of D. insulare in most crop habitats especially in the field of tomato and corn suggests that these crops could be interplanted with cabbages that may enhance the role of D. insulare as a biocontrol agent of diamondback moth.
  Idris A. B. and E. Grafius
  The influence of habitats on the percentage parasitism of diamondback moth larvae, Plutella xylostella L. by Diadegma insulare was studied. Percent parasitism was significantly different among habitats. Parasitism occurred in all habitats with the exception of centre of the woodland. This suggested that D. insulare was very mobile in the heterogeneous habitats. Percent parasitism was high in most crop and non-crop (only when Daucus carota L. is present in the majority of plants) habitats, however, it was significantly influenced by the interaction between habitats and times (months or years) of observations conducted. The percentage parasitism decreased as the distance of treatments in corn fields, from the field edge increased, suggesting that the corn field is not the primary habitat for D. insulare. The possible effect of polyculture systems on the impact of D. insulare in diamondback moth management program is discussed.
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