Laboratory and field evaluation of insecticides against the olive bark beetle Phloeotribus scarabaeoides Bern. (Coleoptera : Scolytidae)‎ in Fayoum, Egypt

Abstract EN

Under laboratory conditions depending on the exit holes, Cidial L50% was the most effective insecticide at 200 and 400 cm3 /100Lwater.

Basodin 60% at 300 cm3 / 100Lwater was the most effective.

The least effective was Keiton L 50% at 200, 300 and 400cm3 /100Lwater.

The highest percent reduction in number of holes was recorded for Cidial L50% treatment (42.43%) at 400 cm3 /100Lwater concentration.

Also results showed that Keiton L 50% was the least effective in reducing the number of emerged beetles while both Basodin and Cidial L50% were similarly reduced the number of beetles emerged under laboratory conditions.

Application of insecticides considerably affected parasitoids emergence with Cidial L50% at 200 and 400 cm3 /100Lwater only 4.17- 4.33 individuals/one cutting were found compared with 34.17 parasitoids from untreated one cutting.

No parasitoids were found with the use of Basodin 60%.

Therefore, Cidial L or Basodin; 400cm3 /100L water are recomended in case of severe infestation by the scolytid P.

scarabaeoides on olive trees.

Under field conditions, the use of Cidial L50% and Basodin 60% EC against the olive bark beetle P.

scarabaeoides reduced the number of inside holes by 38.52 and 19.44%, respectively Cidial L50% increased efficacy was due to its repelling effect.

However, Basodin 60% EC was more effective in reducing the number of beetles emerged, due to higher mortality of beetles in maternal galleries of olive branches.

Statistical analysis indicated no significant difference between the two tested insecticides.