EVALUATION OF VARIETIES AND ECOFRIENDLY MANAGEMENT OF INSECT PESTS OF BRINJAL WITH SPECIAL REFERENCE TO SHOOT AND FRUIT BORER, Leucinodes orbonalis, GUENEE
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Date
2016
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Acharya N.G. Ranga Agricultural University, Guntur
Abstract
The different experiments on “Evaluation of varieties and eco-friendly management of insect pests of brinjal with special reference to shoot and fruit borer, Leucinodes orbonalis, Guenee were carried out during late kharif 2015-16 in insectary premises, department of entomology, S.V. agricultural college, Tirupati. Among tested varieties and hybrids of brinjal for insect pests, the shoot damage by Leucinodes orbonalis ranged from 4.06 to 15. 37 per cent. The lower shoot damage was recorded in Arka Neelakanth (4.06%), CVK (4.66%), Shyamala (5.30%), PHB909 (6.06%) and Arka Keshav (6.46%).
Name of the Author : S.UMAMAHESH Title of thesis : “EVALUATION OF VARIETIES AND ECOFRIENDLY MANAGEMENT OF INSECT PESTS OF BRINJAL WITH SPECIAL REFERENCE TO SHOOT AND FRUIT BORER, Leucinodes orbonalis, GUENEE.”
Degree to which it is submitted
: MASTER OF SCIENCE IN AGRICULTURE
Faculty : AGRICULTURE Major field : ENTOMOLOGY Chairperson : Dr. K. MANJULA University : ACHARYA N.G. RANGA AGRICULTURAL UNIVERSITY Year of submission : 2016
The mean fruit damage comparatively was less in hybrid Shyamala, Arka Neelakanth. In these two lines, on number basis, the mean per cent damaged fruits were 23 to 26 per cent. On weight basis also, similar results were obtained (22 to 23 % mean fruit damage). The highest mean fruit damage was recorded in CVK variety (65.83% on number basis and 59.55% on weight basis) followed by Ranjitha hybrid and Arka Kusumakar variety (58 to 59% and 53 to 57% on number and weight basis respectively) at 100 days after transplanting. In remaining lines also, above 35 per cent fruit damage was recorded.
Plant height, number of branches, leaves and leaf area did not show any impact on the damage by L. orbonalis. Density of trichomes was found to have negative impact on L. orbonalis. The highest number of trichomes (201 per cm2 leaf area) was recorded on Shyamala. The lowest were in Arka Kusumakar which was highly susceptible one. However, in many of the tested lines, above 150 trichomes/cm2 leaf area were noted.
Moderate level of incidence of epilachna beetle, leafhoppers, aphids and mealy bugs was recorded. L. orbonalis incidence was negatively correlated with minimum temperature, Relative humidity, sunshine hours and wind velocity. L. orbonalis incidence was positively correlated with maximum temperature. Among the ten ecofriendly approaches tested against L. orbonalis on CVK variety, application of FYM or vermicompost or neemcake + removal of infested shoots and fruits at regular intervals + one spray of spinosad recorded lower shoot and fruit infestation.
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D5339
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