| In order to understand the non-consumption stress effect of Eocanthecona furcellate (Wolff) on the reproductive fitness of Spodoptera litura (Fabricius), three treatments were set up in this experiment. Treatment Ⅰ: Two paired S. litura adults, two E. furcellate femal adults. Treatment Ⅱ: Two paired S. litura adults, two E. furcellate femal adults, plus two 4th instar larvae of E. furcellate. Treatment Ⅲ: Only two paried S. litura adults. The results showed that, non-consumption stress from E. furcellate affected the reproduction fitness of S. litura adults obviously when they were stayed in a narrow space together, S. litura adults usually tried to run away from the touch of E. furcellate, and the fecundity of S. litura was reduced under the distraction from E. furcellate. The average fecundity of E. furcellate femald in treatmentⅠ and treatmentⅡ were were significantly less than the control. E. furcellate also had a strong impact on the quantity, size, construction and space distribution of egg-masses of S. litura. In the treatment I and II, the number of egg masses of S. litura were less, and the volume of egg-masses were smaller than the control, and egg-masses were mainly composed with single and double layer eggs. From the vertical distribution pattern of the S. litura eggs, egg masses mainly located in the upper part of the cage in the TreatmentⅠ, and the middle-upper part in the Treatment Ⅱ, while egg-masses were intensively distributed at the bottom part of the cage in the control. These results suggested that E. furcellate had an obvious nonconsumption stress effect on the production fitness of S. litura. |
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