Abstract:
The cockhafer (Melolontha
melolontha L.) is the most widespread and
best known bug. It is a polyphagous bug,
being harmful both in adulthood and in
larva stage. The researches were conducted
at Agricultural Research and Development
Station (A.R.D.S.) of Secuieni, Neamţ
county, Romania, and followed the
evolution of adult flight, during 1993 – 2012
with a light trap help. The gatherings and
records were made daily from 1 April to 31
October every year, during the observation
period. Dividing the observation period into
four stages of five years each, it was found
that the largest number of specimens,
38059, was collected in the second stage
(1998 – 2002), followed by the third stage
(2003 – 2007) with 18167 specimens, first
stage with 12173 specimens, and the lowest
number of 286 specimens was recorded in
the fourth stage (2008 – 2012). The adults
flight started in all the years in the second or
the third decade of April and lasted until the
second or the third decade of May, with the
exception of 1995 şi 2009 when he finished
in the first decade of June. The average
duration of the flight was 39 days. The
maximum flight curve was reached, in all
years of observation, in the third decade of
April and first decade of May. The
maximum intensity of flight curves was
recorded every three years, as follows:
1994, 1997, 2000, 2003, 2006, 2009, 2012.
This shows that, in Secuieni conditions, the
insect has one generation at 3 years. Highest
intensity of flights has been in the years
2000, when the top flight was conducted by
38059 specimens, 2003 with 13912
specimens/flight and 1997 with 10221
specimens/flight.The cockhafer (Melolontha
melolontha L.) is the most widespread and
best known bug. It is a polyphagous bug,
being harmful both in adulthood and in
larva stage. The researches were conducted
at Agricultural Research and Development
Station (A.R.D.S.) of Secuieni, Neamţ
county, Romania, and followed the
evolution of adult flight, during 1993 – 2012
with a light trap help. The gatherings and
records were made daily from 1 April to 31
October every year, during the observation
period. Dividing the observation period into
four stages of five years each, it was found
that the largest number of specimens,
38059, was collected in the second stage
(1998 – 2002), followed by the third stage
(2003 – 2007) with 18167 specimens, first
stage with 12173 specimens, and the lowest
number of 286 specimens was recorded in
the fourth stage (2008 – 2012). The adults
flight started in all the years in the second or
the third decade of April and lasted until the
second or the third decade of May, with the
exception of 1995 şi 2009 when he finished
in the first decade of June. The average
duration of the flight was 39 days. The
maximum flight curve was reached, in all
years of observation, in the third decade of
April and first decade of May. The
maximum intensity of flight curves was
recorded every three years, as follows:
1994, 1997, 2000, 2003, 2006, 2009, 2012.
This shows that, in Secuieni conditions, the
insect has one generation at 3 years. Highest
intensity of flights has been in the years
2000, when the top flight was conducted by
38059 specimens, 2003 with 13912
specimens/flight and 1997 with 10221
specimens/flight.
