Abiotic factors affecting the infectivity of Steinernema carpocapsae (Rhabditida: Steinernematidae) on larvae of Anastrepha obliqua (Diptera: Tephritidae)
The effects of soil depth, soil type and temperature on the activity of the nematode Steinernema carpocapsae (Filipjev) were examined using larvae of the West Indian fruit fly, Anastrepha obliqua (Macquart). Bioassays involved applying infective juveniles (IJs) to the surface of sterilized sand in PVC tubes previously inoculated with fly larvae of two ages. The 50% lethal concentration (LC50) values estimated for 6-day-old larvae were 9, 20 and 102 IJs/cm2 in tubes containing 2, 5 and 8 cm depth of sand, respectively, whereas for 8-day-old larvae, LC50 values were 16, 40 and 157 IJs/cm2, respectively. The effect of soil texture on the activity of S. carpocapsae was tested by applying the corresponding LC50 concentrations of nematodes to sand, sand-clay and loamy-sand soils. For 6-day-old larvae, soil type had a highly significant effect on infection with the highest percentages of infection observed in the sand-clay mixture (60-82% depending on depth) compared to 45-64% infection in sand and 23-30% infection in loamy-sand soil.
| Main Authors: | , , , , , |
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| Format: | Texto biblioteca |
| Language: | eng |
| Subjects: | Anastrepha obliqua, Steinernema carpocapsae, Análisis de suelos, Control biológico de plagas, |
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