SCREENING OF RIDGE GOURD [Luffa acutangula(L.)Roxb.] GENOTYPES AGAINST LEAF MINER, Liriomyza trifolii (Burgess) AND FRUIT FLY, Bactrocera cucurbitae (Coquillett)
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University of Horticultural Sciences, Bagalkot
Abstract
An investigation on screening of ridge gourd [Luffa acutangula (L.) Roxb.]
genotypes against leaf miner, Liriomyza trifolii (Burgess) and fruit fly, Bactrocera
cucurbitae (Coquillett) was undertaken during the year 2012-2013 at the Department of
Horticulture Entomology K.R.C.C.H., Arabhavi, Karnataka. The level of leaf miner and
fruit fly infestations was varied significantly between the genotypes and age of the crop.
Significantly low level of leaf infestation was recorded in Arka Sumeet and Mudigere
local genotypes. The highest per cent fruit infestation was recorded in the genotype
Vijayawad local, while significantly lowest was recorded in the genotypes, KRCCH-1
and Amoha compared to other genotypes. The per cent infestation of fruits also varied
across the age of the fruits, the lowest per cent infestation of fruits was recorded at
initial growth and highest at later stage of the crop. Further the eighteen ridge gourd
genotypes were grouped into highly susceptible, susceptible, moderately resistant,
resistant and highly resistant genotypes. KRCCH-1 and Amoha were found to be highly
resistant and resistant respectively. Twelve genotypes out of 18 genotypes screened
were found in third category i.e. moderately resistant to fruit fly attack. Three genotypes
such as JL-5, Sureka, Pusa Nasdar were grouped in susceptible category and one
genotype Vijayawad local was subjected to susceptible category. Further, the genotypes
were classified based on both leaf miner and fruit fly infestation. About, six genotypes
(33.33 % of genotypes) viz., Mudigere local, Arka Sumeet, KRCCH-1, Chintamani
local, Naga and RGM-11 were resistant to both leaf miner and fruit fly incidence.
Whereas, other six genotypes (33.33 % of genotypes) viz., JL-5, Gadag local, Kadahatti
local, Parabhani Padmini, Vijayawad local and Torilong Krishna were susceptible to
both leaf miner and fruit fly infestation. The genotypes having more thickness,
trichomes on leaf, fruit toughness and pericarp thickness were found to be important
biophysical traits assuring reduced leaf miner and fruit fly infestation. These traits
proved important criteria for breeding leaf miner and fruit fly resistant genotypes in
future.
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