Biological control of diamondback moth in Negros Oriental [Philippines]
1994
Gohlicke, H. | Bojos, C.
Surveys on natural parasitization of eggs and larvae of diamondback moth, Plutella xylostella L. (Lepidoptera: Yponomeutidae), were conducted in the Canlaon City vegetable areas in Negros Oriental, Region 7, [Philippines] from June 1993 to March 1994. Natural egg parasitization of diamondback moth was found to reach an average rate of almost 40 percent. Larval parasitization did not occur, indicating that no larval parasitoids were present. To contribute to the control of diamondback moth in the Canlaon areas, rearing of Diadegma semiclausum, Helen (Hymenoptera: D. Ichneumonidae) was initiated in November 1993. Field releases of D. semiclausum started in January 1994. First results of monitorings in release and other fields tend to show that D. semiclausum is establishing, with some fields reaching larval parasitization rates of more than 70 percent
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