Spatial dynamics of teak defoliator (Hyblaea puera Cramer) - Cochin ...

Table 7.1. Correspondence between light-trap catch and incidence ofoutbreak:
Sl.No. of Starting Cwnulative Distance Area Whether
outbreak date of number of between infested locally
which outbreak moths trapped light-trap (ha) emerged
occurred (date ofegg during a 5 day and the moths are
during the laying) period prior infested present
period of to start of site (km)
light-trap outbreak
operation
1 7 Julv 1993 145 0.05 52.0 Yes
2 27 August 0 0.5 36.1 No
1993
3 I 74 2.0 35.7 No
September
1993
4 4 April 1 0.5 12.2 No
1994
5 12 May 9 0.05 472.5 No
1994
6 3 June 1994 596 3.0 75.0 Yes
7 12 June 0 0.05 435.3 No
1994
The first outbreak: occurred on 7 July, 1993 at an area of 52 ha. which
was 0.05 km away from the light-trap. A total of 145 moths were collected
during the five day period prior to 7 July. There were locally emerged moths
during this period at Kariem-Muriem from an outbreak which occurred on 10
June. The second outbreak: was on 27 August 1993 covering an area of36.1 ha
at a distance of0.5 km from the light-trap. No moths were collected during the
days prior to this date. There were no locally emerged moths at Kariem­
Muriem during this period. The third outbreak: also occurred when there were
no locally emerged moths but 74 moths were collected during the days prior to
the start of the outbreak. This outbreak occurred at a distance of 2 km away
from the light-trap and covered 35.7 ha. The fourth outbreak occurred on 4
April 1994 at distance of 0.5 km from the light-trap and covered an area of
12.2 ha. Only one moth was collected and there were no locally emerged
moths. A major outbreak occurred on 12 May 1994 covering an area of472.5
ha and 0.05 km away from the light-trap. Only 9 moths were collected prior to
this outbreak. No locally emerged moths were present during this period. The
next outbreak extended to an area of 75 ha at a distance of 3 km from the
light-trap. A total of 596 moths were collected on days preceding the start of
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