Abstract
The rate of mortality of Larvae infected with NPV was studied in two laboratory tests and in one field plot test using hand operated sprayer and battery operated ULV disc applicator. Under laboratory conditions 65 35% and 82.30% mortality was noticed in a period of five days after the date of treatment. For the same period 39 09% and 43.63% mortality was observed in the case of larvae collected from the fields treated with NPV, using hand operated sprayer and battery operated ULV disc applicator res- pectivary. Complete mortality was noticed in eleven days in the case of larvae collected from the fields while it took only nine days under laboratory conditions. No marked difference in mortality was noted due to the use of hand operated or battery operated. ULV disc applicator.
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