Feed preferences, 3rd instar of larvae P. ramburi 3rd instar of larvae are most active phase of the feed in the life period P. ramburi, the phase preference of predators on prey stadia are as follows (Table 1).
The preference index 3rd instar of larvae of P. ramburi is seen that the four stadia preferred prey by predators, evident from the preference index is positive. If the preference index close to 1, indicating that the stadia are increasingly favored prey by predators. Table 1 shows that the preference index of prey in the second instar (0.159) are highest compared to others, it can be said that the second instar stage of prey is most preferred by predators. Whereas prey on adults of phase has the lowest preference index (0.129). The high preference of 347
International Journal of Sciences: Basic and Applied Research (IJSBAR) (2014) Volume 15, No 2, pp 343-354
predators on second instar of pray, because this phase has a body size relatively small (length + 0.41 and width + 0.17 mm), with the structure of the outer shell is still soft making it easier for predators to catch and sucking host body fluids. Instead the low preference in adults because adult body size larger (length + 1.25 and width + 0.63 mm), and a tougher outer skin so that predators are more difficult to deal with using mandibel. Prey handling time difference can be seen in the figure below (Figure 3).