Seasonal abundance of insect-pests of brinjal and evaluation of organic products for their management
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Date
2018-08
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CSKHPKV, Palampur
Abstract
The present investigations entitled "Seasonal abundance of insect-pests of brinjal and evaluation of organic
products for their management" were conducted at Experimental Farm, Department of Entomology,
CSKHPKV, Palampur during Kharif 2017 to study the seasonal incidence and bio-efficacy of seven
organic products namely, Agniastra (5%), Brahmastra (5%), Cow urine (10%), Darekastra (10%),
Jeevamrit (10%), Panchagavya (10%), Tamralassi (5%) and one insecticide emamectin benzoate (0.002%)
against Leucinodes orbonalis. Seasonal incidence of Amrasca biguttula biguttula was apparent from 30th
SW and the peak population was observed during 37th SW (8.11 jassids/ 3 leaves). The trap catch data of L.
orbonalis adult moths showed that incidence started from 29th SW and maximum number of moths were
trapped in 37th SW (19 moths/ week). Bioefficacy studies revealed that among the organic products,
Agniastra (5%), Brahmastra (5%) and Cow urine (10%) were effective against L. orbonalis. However,
emamectin benzoate was superior to all the organic products. In Set 1(prophylactic sprays), maximum
mean shoot infestation was observed 7 days after ninth spray (15.63%) while in Set 2 (sprays applied after
the appearance of pest), it was observed 7 days after fifth spray (22.92%). In Set 1, the descending order of
efficacy of treatments in terms of shoot infestation by L. orbonalis was emamectin benzoate > Agniastra >
Brahmastra > cow urine > Jeevamrit > Darekastra > Panchagavya > Tamralassi. In Set 2, the descending
order of efficacy of treatments was emamectin benzoate > Agniastra > cow urine > Brahmastra >
Panchagavya > Tamralassi > Darekastra >Jeevamrit. In Set 1, the descending order of efficacy of
treatments against fruit infestation (number and weight basis) by L. orbonalis was emamectin benzoate >
Agniastra > Brahmastra > cow urine > Jeevamrit > Darekastra > Tamralassi > Panchagavya. In Set 2,
the descending order of efficacy of treatments against fruit infestation (number basis) was emamectin
benzoate > Agniastra > Brahmastra > cow urine > Darekastra > Panchagavya > Tamralassi > Jeevamrit.
In Set 2, the descending order of efficacy of treatments against fruit infestation (weight basis) by L.
orbonalis was emamectin benzoate > Agniastra > Brahmastra > cow urine > Darekastra > Tamralassi >
Panchagavya > Jeevamrit. In both the sets, maximum mean total number and weight of fruits as well as
maximum mean number and weight of marketable fruits were obtained with emamectin benzoate
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