LABORATORY AND FIELD EVALUATION OF INSECTICIDES AGAINST THE OLIVE BARK BEETLE Phloeotribus scarabaeoides Bern. (COLEOPTERA: SCOLYTIDAE) IN FAYOUM, EGYPT.

Document Type : Research articles.

Authors

1 Department of Plant Protection, Faculty of Agriculture, Fayoum University

2 Plant Protection Research Institute. A.R.C., Ministry of Agriculture.

Abstract

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.

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