Paralyzation ability, parasitism and viability of Habrobracon hebetor under photoperiod effect
Abstract
This study evaluated the rates of paralyzation, parasitism and reproductive success of Habrobracon hebetor (= Bracon hebetor), parasitoids of lepidopteran pests of stored products, under the influence of different photoperiods. Parasitoids developed during pre-imaginal stage in three different photoperiods (light/dark) 24:0, 12:12 and 0:24, and then adults from each treatment were exposed to 0, 12 and 24 hours of photophase, totalizing 9 treatments. One parasitoid couple was placed in a Petri dish containing ten larvae of last instar Ephestia kuehniella, being removed after each 24 hours and transferred to a new dish with ten larvae, until the death of the female. Number of paralyzed and parasitized larvae and number of eggs were evaluated daily. The parasitized larvae were maintained in the same conditions of photoperiods to verify the viability (%) of each development stage. The number of paralyzed larvae was always higher than parasitized with a maximum parasitism between the 2nd and 4th day of age. Accumulated parasitism reached 80% between the 6th and 8th day of age, independent of the photoperiod. The mean number of survivors at each stage of development was higher in offspring born from full photophase with an increase in the total number of eggs produced by them. However, between treatments, the final viability was not affected considering the proportion of initial oviposition. The photoperiod in adult stage did not influence the performance of H. hebetor.
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