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.
The predicted damage and yield loss caused by rice leaffolders, Cnaphalocrocis medinalis (Guence) and Marasmia patnalis (Bradley) in microplot experiment during kharif 1996 showed that the yield loss was higher at the initial infestation by leaffolder larvae at 40 DAS than the infestation at 30 DAS. There was no proportionate increase in yield loss with increasing larval populations. The rate of yield loss due to an increment of one percent damage was more pronounced at 10 percent base level damage i.e., 10 to 11 percent than at higher base level damage of 20, 30 to 90 percent.
Field trials conducted against Spodoptera litura (Fb.) with nuclear polyhedrosis virus (NPV) on groundnut (Arachis hypogaea L.) in eight different locations of Tamil Nadu revealed that two rounds of application of NPV at 250 Larval equivalent (LE)/ha with the adjuvant crude sugar at 2.5 kg/ha at ten days interval was significantly superior than untreated check in reducing the larval population and increasing the pod yield. irrespective of the locations tested.
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