RELATIVE TOXICITY OF SOME READY MIX FORMULATION AGAINST BRINJAL SHOOT AND FRUIT BORER Leucinodes orbonalis (Guenee)
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Date
2019-07-11
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Dr. Panjabrao Deshmukh Krishi Vidyapeeth, Akola, Maharashtra.
Abstract
The present investigation entitled “RELATIVE TOXICITY OF SOME READY MIX FORMULATIONS AGAINST BRINJAL SHOOT AND FRUIT BORER Leucinodes orbonalis (Guenee)” was conducted in order to study the persistent toxicity of different ready mix insecticide products and their relative toxicity against brinjal fruit borer Leucinodes orbonalis. The experiment was conducted during the year 2018-2019 in the Toxicology Laboratory of Department of Entomology, Dr. PDKV, Akola. The insecticides used as a treatments included, Novaluron 5.25% SC + Indoxacarb 4.5% SC, Profenophos 40% EC + Cypermethrin 4% EC, Indoxacarb 14.5% SC + Acetamiprid 7.7% SC, Pyriproxifen 5% EC + Fenpropathrin 15% EC along with untreated control. The larvae of Leucinodes orbonalis were reared on potatoes using standard rearing technique under laboratory conditions for studying relative toxicity as well as for use in persistent toxicity studies.
Fruit dip (Ahmad et al., 2010) method of bioassay were followed in order to determine the lethal concentrations and working out of Relative Toxicity (RT) values of different ready mix formulations against Leucinodes orbonalis. The observations of mortalities on each concentration were recorded at a regular interval up to 72 hours. The relative toxicity studies revealed that Indoxacarb 14.5% SC + Acetamiprid 7.7% SC was highly toxic to the 3rd instar larvae of Leucinodes orbonalis in fruit dip method of bioassay. From the results, four insecticide readymix products studied for their relative toxicities by fruit dip bioassay method can be arranged in their decreasing order of toxicities as [Indoxacarb 14.5% SC + Acetamiprid 7.7% SC] > [Profenophos 40% EC + Cypermethrin 4% EC] > [Pyriproxifen 5% EC + Fenpropathrin 15% EC] > [Novaluron 5.25% SC + Indoxacarb 4.5% SC ].
Under the persistence studies on these four ready mix formulations, two sprays of each insecticide (as treatment) at recommended doses were applied on brinjal crop in the field. The treated brinjal fruits from each insecticide plots were plucked at 1, 3, 5, 7, & 9 days of application and fed to the third instar larvae of Leucinodes orbonalis from the laboratory grown culture. They were allowed to feed on the treated fruits under ambient conditions in the laboratory. Simultaneously, a control without treatment was also maintained. The observations on mortalities in treated and untreated fruits were recorded at regular interval upto 120 hours period.
The persistent toxicity studies after 1st and 2nd spray revealed that, Indoxacarb 14.5% SC + Acetamiprid 7.7% SC recorded the highest Persistent Toxicity index (PTi) while Pyriproxifen 5% EC + Fenpropathrin 15% EC recorded the lowest PTi. Computation on PT50 values to determine time duration for 50% kill on residual toxicity revealed that Indoxacarb 14.5% SC + Acetamiprid 7.7% SC recorded highest residual toxicity while Pyriproxifen 5% EC + Fenpropathrin 15% EC recorded the lowest residual toxicity. Based on PTi and PT50 values the four ready mix insecticide formulations can be arranged in descending order for their Relative Persistence as [Indoxacarb 14.5% SC + Acetamiprid 7.7% SC] > [Profenophos 40% EC + Cypermethrin 4% EC] > [Novaluron 5.25% SC + Indoxacarb 4.5% SC] > [Pyriproxifen 5% EC + Fenpropathrin 15% EC].
From these investigations Indoxacarb 14.5% SC + Acetamiprid 7.7% SC readymix insecticide formulation emerged as the most toxic and highly persistent insecticide formulation for management of Leucinodes orbonalis on brinjal.
The present investigation concluded that Indoxacarb 14.5% SC + Acetamiprid 7.7% SC ready mix insecticide formulation emerged as the most toxic and highly persistent insecticide formulation for management of Leucinodes orbonalis on brinjal.
Description
The present investigation concluded that Indoxacarb 14.5% SC + Acetamiprid 7.7% SC ready mix insecticide formulation emerged as the most toxic and highly persistent insecticide formulation for management of Leucinodes orbonalis on brinjal.
Keywords
Plant protection, Control methods, Chemical Control, Pest control, Spraying, Toxicity, Toxicology, Solution, Pesticides, Insecticides, Pest, Leucinodes orbonalis, Statistical method, Data Analysis.
Citation
SAPKAL, SEEMA BHARATRAO. (2019).RELATIVE TOXICITY OF SOME READY MIX FORMULATION AGAINST BRINJAL SHOOT AND FRUIT BORER Leucinodes orbonalis (Guenee). Department of Agricultural Entomology, Dr.Panjabrao Deshmukh Krishi Vidyapeeth, Akola. M. Sc. 2019. Print. xiii, 53p. (Unpublished).