Studies on morphological basis of resistance and management of brinjal shoot and fruit borer Leucinodes orbonalis (Guenee) in brinjal
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Date
2018
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CCSHAU
Abstract
The studies on brinjal genotype screening for relative resistance based on morphological parameters among various brinjal genotypes, biology of Leucinodes orbonalis and chemical control of Leucinodes orbonalis Guenee were conducted at CCSHAU, Regional Research Station, Bawal during 2017. Genotype screening based on morphological parameters revealed that, genotypes 33-3, Arka Keshav, Arka Anand were found highly resistant to brinjal shoot and fruit borer owing to presence of morphological characters which confers resistance to L.orbonalis like long fruits (28.30 cm), less diameter of fruits (8.20 cm), narrow pericarp (0.29 cm), short pedicel (3.03 cm), fruit shape (long), greater number of seeds, high hair density (221.86/cm2) and spines. While these factors were found to vary in remaining genotypes and were found susceptible to L.orbonalis.Studies on biology of L.orbonalis revealed that the eggs of this species were creamy white, laid singly. The average incubation period of eggs varied from 3.74 and 4.00 days during 1st and 2nd generations, respectively. There were five larval instars and the average larval duration varied from 11.50 to 12.85 days during 1st and 2nd generations, respectively. The pupa was dark brown in colour, obtect and the average pupal period varied from 7.61 to 7.96 days during 1st and 2nd generations, respectively. The female abdomen was swollen, whereas, in the males, abdomen was cylindrical and thinner. Adult moths lived for 4.56 to 4.94 days during 1st and 2nd generations, respectively. The total life cycle of L.orbonalis ranged from 27.74 to 29.78 days during 1st and 2nd generations, respectively. The maximum eggs were laid during September i.e., 80 eggs followed by 70.80 eggs during October 2017. The maximum oviposition period was reported during September 2017 (2.57 days) followed by October (1.99 days). There was a little dominance of female moth population. Male and female ratio ranged from 1:1.6 to 1:1.80 during September and October, respectively with an average ratio of 1:1.70. Studies on chemical control of Leucinodes orbonalis revealed that, treatments of Emamectin benzoate 5% SG and Chlorantraniliprole 18.5% SC were found most effective. The insecticides viz., Azadirachtin 5% EC and Bacillus thuringiensis 5% WP were found least effective against shoot and fruit borer. The remaining treatments viz., Spinosad 45% SC, Lambda cyhalothrin 5% EC, Pyriproxyfen 5% EC + Fenpropathrin 15% EC were found moderately effective.
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