screening elite genotypes and ipm of defoliators in groundnut

sunflower and N. rileyi, foxtail millet used as intercrop and Emamectin benzoate used for
spraying where as other treatments remained same as that of M-I. These two modules were
compared with M-III which comprised of farmer’s practice. The results obtained are presented
in tables.
4.2.1 Monitoring the activity of S. litura
The daily trap catches of male adults of S. litura in pheromone traps during Kharif
2009 indicated definite pattern of occurrence during August and September (Apendix-I).
In first module
During the cropping season, the maximum number of moths were caught on fourth
day of second week of August (451.0) and minimum number of moths were caught on fourth
day of third week of August (13.0). The maximum number of adults were caught during first
and second week of August. The least number of moths were caught on fifth day of first week
of September (18.0) and maximum (75.0) on seventh day of second week. In September
month, the maximum number of adults were caught during second week compare to other
weeks.
In second module
During August month, the maximum number of moths were caught on fifth day of
third week (159.0) and the minimum (18.0) number of moths on first day of fourth week.
During September month, the highest number of moths caught on seventh day of second
week (112.0) and lowest (13.0) on fourth day of first week. In second module, the highest
number of moths were caught during first week of August compare to September.
Between Module-I and II, the highest number of moths were caught in Module-I
compare to Module –II.
4.2.2 Sucking pest population in different IPM modules of groundnut
4.2.2.1 Thrips (Scirtothrips dorsalis and Thrips palmi)
Nymphs and adults were found sucking the sap from leaves, starting from 21 DAS to
63 DAS. Population of thrips ranged from 2.60 to 3.28 /top three leaves in M-I. In M-II it was
ranged from 1.40 to 2.48. In case of third module the thrips population was varied from 3.16
to 3.84 (Table 6).
As per Paired ‘t’ value, there was significant variation in sucking pest population in
different IPM modules. Module-II was significantly superior over module-I and module-III
during 21 DAS to 63 DAS. Whereas module-I was significantly superior over module-III during
same period.
4.2.2.2 Leafhoppers (Empoasca kerri)
Leafhoppers population found to attack the crop from 21 DAS to 63 DAS with the
population of 1.44 to 2.24 / top three leaves in M-I. In M-II, the population of leafhoppers
ranged from 1.24 to 2.38. In module-III (farmer’s practice) the population varied from 2.40 to
3.45/ top three leaves (Table 7).
As per Paired ‘t’ value, all the three modules varied significantly from each other.
Module-II was significantly superior over module-I and module-III during 21 DAS to 63 DAS.
However module-I was significantly superior over module-III during 21 DAS to 63 DAS.
4.2.3 Defoliator population in different IPM modules of groundnut
4.2.3.1 Semilooper (Thysanoplusia orichalcea)
This pest was observed on the crop from 37 DAS to 79 DAS. The young caterpillars
scraped the chlorophyll content of the tender leaves from undersurface. Later instars caused