The seasonal activity of beet flea beetle, Chaetocnema tibialis (Illiger), adults
was studied on sugar beet varieties at Homs Region during 2008 season.
Results obtained indicate that the beet flea beetle, Chaetocnema tibialis
(Illiger) adults was
started at the 2nd week of May to all varieties in the 1st and
2nd dates of plantation. The number tended to increase, rather gradually, from
early June reaching peak (65.9 and 97.9 holes/25 leaves) for two dates.
Two peaks occurred during 2008 season, ware as follows:
• The 1st peak occurred in the 4th week and the 2nd week of June (65.9 and
97.9 holes/25 leaves) for 1st and 2nd dates, respectively.
• The 2nd peak occurred in the 4th week of July (118.42 and 364.14 holes/25
leaves) for 1st and 2nd dates, respectively.
The results obtained indicate, that Vico sugerbeet variety was highest
susceptible (50.99 and 116.45 holes/25 leaves) for the 1st and 2nd dates,
meanwhile, Ramona and Prognos were lowest infested. The infestation started
with quite low holes (2.96 holes/25 leaves) at the 3rd week of May and increased
gradually at the 4th week of June with 65.90 holes/leaf, and in end of season
arrived to (118.42 holes/25 leaves). The infestation percentage increased by beet
flea beetle in the 2nd date (the 1st week of February) with twice of infested on
the 1st date (the 1st half of January). Six pesticides were evaluated against beet
flea beetle, results showed that Cyperino pesticide gave the highest effective
percentage (90.88%) followed Cypermethrin by (90.69%), in comparison with
Nimadol pesticide (49.35%) after two week of treatment.
