Relationships Between the Parasitoid Hyposoter exiguae and the Cabbage Looper, Trichoplusia ni : Effects of Host Age on Developmental Rate of the Parasitoid 12

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Abstract
Effects of age of Trichoplusia ni (Hübner) on rate of development of Hyposoter exiguae (Viereck), a solitary endoparasitoid, and the relationships of parasitism to growth and developmental patterns of the host were determined. Hosts parasitized prior to the sixth day of age initially developed similarly to nonparasitized individuals, but from the 6th day parasitized larvae grew slower. The maximum weight of these larvae was about one-seventh that of nonparasitized individuals. Growth patterns of larvae parasitized after the sixth day of age are almost immediately observable. Parasitized individuals gain little or no weight as compared with normally developing larvae. The maximum weights of these larvae were one-fifth to one-third the weights of nonparasitized larvae. Parasitoid development time was significantly negative when correlated with host age. Those starting their development in 1-day-old hosts required 13.85 days to complete development, whereas parasitoids starting development in 10-day-old hosts required only 7.4 days to complete development. Developmental rate changes most dramatically from one- to four-day-old hosts, by more than four days. In hosts five-ten days old development differed by approximately one day.

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