Maize genotypes i.e. Arun 2 (Short duration), Rampur composite (Long duration) and
Gaurav (Hybrid) were seeded in weekly interval throughout the years at NMRP, Rampur
during two consecutive years, 201 0/ 11 and 2011112 to assess the effect of environment on
growth and development of Maize Stem Borer, Chilo partel/us Swinhoe infestation along
with other associated pests. Percent insects' damage was in the similar trend in both the
years proportional to prevailing temperature. Range of borer damage varied from 4.53% to
61.03 % in 20 I 0/1 1 and 4.4% to 64.9 % in 2011/12. The percent infestation of the years
was found highest in the month of April (58.2 %) followed by May (48.2 %), July (44.9 %)
and March (42.7 %) and approximately similar movement of damage were recorded in
other parameters (Score, Tunnel length and exit holes) too. Out of three varieties tested,
Gaurav was comparatively more sensitive to maize stem borer damage (37.7%) than Arun 2
(34.5%) and Rampur composite (32.1 %). Beside this, twenty two other miner insects and
six beneficial insects were also recorded but their damage was nominal. Furthermore,
insects survey carried out at NMRP command areas inferred that maize stem borer was
major one and more or less uniform in each location however average percent damage as
recorded in field was found more at Sukranagar, Chitwan (20.6%) than Manahari,
Makawanpur (14.6%) and Madi, Chitwan (11.3%).

Maize genotypes i.e. Arun 2 (Short duration), Rampur composite (Long duration) and
Gaurav (Hybrid) were seeded in weekly interval throughout the years at NMRP, Rampur
during two consecutive years, 201 0/ 11 and 2011112 to assess the effect of environment on
growth and development of Maize Stem Borer, Chilo partel/us Swinhoe infestation along
with other associated pests. Percent insects' damage was in the similar trend in both the
years proportional to prevailing temperature. Range of borer damage varied from 4.53% to
61.03 % in 20 I 0/1 1 and 4.4% to 64.9 % in 2011/12. The percent infestation of the years
was found highest in the month of April (58.2 %) followed by May (48.2 %), July (44.9 %)
and March (42.7 %) and approximately similar movement of damage were recorded in
other parameters (Score, Tunnel length and exit holes) too. Out of three varieties tested,
Gaurav was comparatively more sensitive to maize stem borer damage (37.7%) than Arun 2
(34.5%) and Rampur composite (32.1 %). Beside this, twenty two other miner insects and
six beneficial insects were also recorded but their damage was nominal. Furthermore,
insects survey carried out at NMRP command areas inferred that maize stem borer was
major one and more or less uniform in each location however average percent damage as
recorded in field was found more at Sukranagar, Chitwan (20.6%) than Manahari,
Makawanpur (14.6%) and Madi, Chitwan (11.3%).