EVALUATION OF SOME TOMATO GENOTYPES FOR THEIR REACTION AGAINST FRUIT BORER Helicoverpa armigera Hubner (Lepidoptera: Noctuidae) IN MID HILLS OF HIMACHAL PRADESH

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dc.contributor.advisorRANA, R.S.
dc.contributor.authorTHAKUR, PRIYANKA
dc.date.accessioned2016-12-26T15:08:01Z
dc.date.available2016-12-26T15:08:01Z
dc.date.issued2015
dc.description.abstractABSTRACT Eight tomato varieties viz. Palam Pink, Solan Vajar, Solan Lalima, Naveen 2000+, Yash, Rakshita, Red Gold and Heem Sohna were evaluated for their reaction to the tomato fruit borer, Helicoverpa armigera (Hubner). Maximum infestation of fruit borer was recorded in the month of May. Egg and larval count of H. armigera was made on these varieties. The per cent fruit infestation in different tomato varieties was 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, leaf area, number of leaf hairs, titrable acidity, reducing sugars, total sugars, total phenols, leaf macro and micro nutrients (nitrogen, phosphorous, potassium, magnesium, iron, copper, manganese and zinc). None of the varieties were found to be immune to fruit borer attack but considerable variation of infestation in different varieties was observed. The percent fruit damage varied from 15.57 to 45.30 per cent recording the highest fruit infestation in ‘Red Gold’ which was significantly at par with ‘Heem Sohna’, ‘Yash’ and ‘Palam Pink’ while the lowest fruit infestation was observed in ‘Solan Lalima’ which was at par with ‘Solan Vajar’, ‘Naveen 2000+’ and ‘Rakshita’. Fruit diameter, leaf area, leaf hairs, nitrogen, potassium, magnesium, iron and manganese content were found to be positively correlated with per cent fruit infestation while fruit length, fruit shape index, fruit pericarp thickness, total sugars, total phenols, phosphorous and zinc content were found to be negatively correlated with the attack of the fruit borer. However on the basis of maximum yield per plant present studies conclude that Naveen 2000+ which also was categorized as less susceptible was found to be the most suitable variety.en_US
dc.identifier.other48431
dc.identifier.urihttp://krishikosh.egranth.ac.in/handle/1/92963
dc.language.isoenen_US
dc.subEntomologyen_US
dc.these.typeM.Sc
dc.titleEVALUATION OF SOME TOMATO GENOTYPES FOR THEIR REACTION AGAINST FRUIT BORER Helicoverpa armigera Hubner (Lepidoptera: Noctuidae) IN MID HILLS OF HIMACHAL PRADESHen_US
dc.typeThesisen_US
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