SCREENING OF SOME BRINJAL CULTIVARS AGAINST BRINJAL SHOOT AND FRUIT BORER (Leucinodes orbonalis Guenee) AND STUDIES ON ITS BIOLOGY
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Date
2017-10
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UHF,NAUNI
Abstract
ABSTRACT
The present studies on “Screening of some brinjal cultivars against brinjal shoot and fruit borer
(Leucinodes orbonalis Guenee) and studies on its biology” was carried out during 2016 in the field and laboratory
conditions in the Department of Entomology, Dr. Y S Parmar University of Horticulture and Forestry, Nauni, Solan.
Eight brinjal cultivars viz. 'Brinjal Long (F1)', 'DS-407', 'Ganesh', 'Long Green', 'Neelkanth', 'Prapti', 'Pusa Purple
Cluster' and 'Pusa Purple Long' were evaluated against brinjal shoot and fruit borer, L. orbonalis (Guenee) under field
conditions. Egg and larval count of L. orbonalis was made on these cultivars. The per cent shoot infestation in
different brinjal cultivars were evaluated on basis of number of shoot damaged whereas the per cent fruit infestation in
different brinjal cultivars were evaluated on the basis of number of damaged fruits and this was correlated with
various parameters like fruit length, fruit diameter, fruit shape, fruit pericarp thickness, fruit weight, fruit yield, plant
height, stem diameter, number of leaf hairs and total phenolic content. None of the cultivars were found to be
tolerant to shoot attack of L. orbonalis infestation but considerable variation of infestation was recorded
among different cultivars. The per cent fruit damage varied from 6.66% to 46.63% recording the minimum fruit
infestation in 'DS-407' and 'Ganesh' while the maximum fruit infestation was observed in 'Prapti' which was at par
with 'Pusa Purple Long' and 'Neelkanth'. Egg population, larval poulation, fruit weight loss, fruit pericarp thickness,
fruit weight, fruit yield, plant height, stem diameter were found to be positively correlated with per cent fruit
infestation while fruit shape index, leaf hairs and total phenol content were found to be negatively correlated with the
attack of fruit borer. Two brinjal cultivars 'Neelkanth' and 'Pusa Purple Long' were taken to study the developmental
biology of the brinjal shoot and fruit borer under laboratory condition. The incubation period was 3.72 and 3.51 days
on 'Neelkanth' and 'Pusa Purple Long' whereas the larval period was found 13.52 and 14.39 days on 'Pusa Purple
Long' and 'Neelkanth'. The total developmental period was 24.52 and 26.41 days on 'Pusa Purple Long' and
'Neelkanth' cultivars, respectively. The fecundity was more on 'Pusa Purple Long' (210.20 eggs per female), as
compared to 'Neelkanth' cultivar (193.40 eggs per female). The total phenol content was estimated on all eight brinjal
cultivars and it was found that maximum in 'DS-407' cultivar (49.65 mg per 100g leaves) whereas, it was minimum in
the 'Prapti' cultivar (37.66 mg per g leaves). The cultivar ‘DS-407’ having higher total phenol content i.e. 49.65 mg
per 100g leaves was found to have lower fruit infestation.
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