In a study on the influence of varieties, spacings and pest management, spraying with monocrotophos 36 WSC at 500 ml/ha. recorded significantly lower infestation of pests and an increase of 10% grain yield. insect resistant cultures IET 6315 and ACM 8 recorded significantly lower incidence of gall midge and stem borer as compared to IR 20. Spacings had no influence on the incidence of the pests and yield. IR 20 at a spacing of 20 x 15 cm, sprayed at ETL recoided the lowest incidence of leaf folder. IET 6315 and ACM 8 recorded significantly lower damage in 20 x 15 cm spacing. The results suggest that gall midge incidence in the moderately resistant varieties can be reduced by adopting a wider spacing and on susceptible varieties with insecticides.
Pot experiments were conducted to assess the damage potential of the groundnut leaf miner, Aproaerome modicalla Deventer. In the case of 20 and 40-day-old plants introduced separately with 2, 4, 6 and 8 larvae per plant, it was observed that the maximum damage in respect of the number of damaged leaflets and percentage of affected leaflets was in'licted within five days of introduction and afterwards there was only a slight increase in the damage. Among the two age groups, the dainage was significantly more in 40-day-old plants at 15th day after introduction. The differences in the leaf area damaged between the tub age groups were not significant. Cumulative damage assessed by the introductions of 2, 4, 6 and 8 larvae per plant when the plants were 20 and 40 days old showed that there was a concomitant increase in the damage with the increase in the number of larvae introduced.
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