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Bio-Ecology and Management of Grape Mites

KrishiKosh

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Title Bio-Ecology and Management of Grape Mites
 
Creator Veerendra A.C.
 
Contributor S.S. Udikeri
 
Subject Agricultural Entomology
 
Description Bioecology and management studies on two spotted spider mite Tetranychus urticae
Koch infesting grapes were carried out during 2012-13.
From roving survey it was evident that in Northern Karnataka mite incidence was
severe with mean population of 18.41 ± 2.4, 12.0 ± 1.8, 11.7 ± 0.2 and 7.5 ± 0.8 per sq inch
of leaf in Bijapur, Belgaum, Bagalkot and Koppal districts respectively. In Southern
Karnataka population was negligible.
Seasonal dynamics studied revealed maximum incidence of mites during 15th and 17th
standard weeks with population of 25.5 ± 0.9 and 24.9 ± 1.4 at Bijapur and Atharga,
respectively. The predatory arthropods observed were coccinellid beetle and predatory mite,
Euseius sp. There was positive and significant correlation between mites and temperature
where as negatively significant negative relation with relative humidity.
In laboratory study the fecundity of T. urticae reared on grape leaves was 66.53 ±
4.93 eggs/female. The female and male longevity was 15.09 ± 0.56 and 8.63 ± 0.30 days
respectively. The period occupied by young stages was 12.55 ± 0.82 days.
Bio-efficacy studies showed that hexythiazox 5.45 EC (1.5 mL/ L), abamectin 1.9 EC
(0.5 mL /L) and propargite 57 EC (2.0 mL /L) as highly effective acaricides against grape
mites. With three sprays the mite incidence reduced from 185.21 to 3.67 per four leaves from
hexythiazox application which rendered 355.81 quintal per hectare grape berry yield. From
abamectin spray the population suppressed from 184.50 to 8.00 per four leaves where in the
yield was 337.81 quintal per hectare.
 
Date 2016-11-23T13:19:23Z
2016-11-23T13:19:23Z
2013
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/87207
 
Format application/pdf
 
Publisher UAS, Dharwad