Some biological activities, field observations and determination of damage of eucalyptus stem borer, Phoracantha semipunctata F.l [electronic resource].

Includes references.

Follow-up of biological activities of eucalyptus stem borer, Phoracantha semipunctata F. (Coleoptera:Cerambycidae) showed that preoviposition, oviposition, post-oviposition and incubation periods recorded 2.25 (1-5), 6.45 (2-12), 5.05 (2-10) and 9.3 (6-13) days, respectively. Durations of pre-pupa and pupa listed 9.5 (3-17) and 15.65 (12-19) days, respectively. The number of pupal chambers and emerged beetles / mother female were 22.8 (8-38) chambers and 19 (7-32) beetles, respectively. Adult hardness recorded 6.55 (4-9) days, the female lived 13.7 (4-25) days, while the male lived 11.25 (5-19) days. The female laid 42.7(12-81) eggs, the percentage of egg death was 21.8% (6.1- 37.5 %). Field observations revealed that attack density represented by number of egg batches varied from 4 to 11 batches per eucalyptus log ( 45- 110cm.long).The number of eggs / batch was 24.48 (6-68) eggs. Hatching percentage (75.71%) differed from 50 %to 93.9 %. Larval density(428.03 larvae /m2) resulted 68.36 % death in number of hatching larvae, 280 full grown larvae (135.42 pupal chamber /m2), 217 emerged beetles (104.95 adult /m2 & 22.5 % death in pupae) and 75.48 % reduction in the broods

Summary in Arabic.

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