Abstract
Host-finding oviposition behavior of Anagrus mutans Walker and Anagrus silwoodensis Walker are similar when attacking either Cicadella viridis (L.) or Dicranotopis hamata (Boheman). Antennae play an important role in finding hosts and orienting the female on top of the host egg. A. mutans was slower handling hosts than A. silwoodensis . Parasitoids reared from C. viridis were larger and handled hosts more slowly than parasitoids reared from D. hamata . Mean times for drilling and initial oviposition in C. viridis and D. hamata were 32.6 and 64.3 s, respectively, for A. mutans reared from C. viridis and 34.5 and 56.1 s, respectively, for A. silwoodensis reared from C. viridis . Both Anagrus species rejected parasitized hosts. Rejection always followed drilling. When smaller D. hamata were attacked, both Anagrus species completely avoided oviposition in a parasitized host. However, when the larger C. viridis hosts were attacked, the degree of avoidance varied, and A. silwoodensis more consistently avoided subsequent ovipositions. Rejection of an already parasitized host by A. silwoodensis occurred as early as 30 s; A. mutans oviposited in hosts up to 15 min after the first attack.
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