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Investigation on Mite Pests of Solanaceous Vegetables with Special Reference to Brinjal

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Title Investigation on Mite Pests of Solanaceous Vegetables with Special Reference to Brinjal
 
Creator Roopa S.Patil
 
Contributor B.S.Nandihalli
 
Subject Agricultural Entamology
 
Description Investigations on mite pests of solanaceous vegetables were carried out during 2003-
2005 at the University of Agricultural Sciences, Dharwad. Among the three phytophagous
mites recorded on brinjal, Tetranychus macfarlanei Baker and Pritchard was most
predominant. The natural enemies comprised of three predatory mites and four insect
predators. Polyphagotarsonemus latus Banks was recorded on chilli and potato as major pest.
In brinjal, spider mite population reached peak twice i.e. in middle of July and November.
Three peaks of P. latus were noticed in chilli, two in summer and one in rabi. Both biotic
and abiotic factors played significant role in deciding the population of P. latus in chilli.
Kharif potato suffered more incidence of P. latus than rabi.
On brinjal, T. macfarlanei completed life cycle faster during summer requiring 22.42±
0.74 and 26.71± 1.88 days as compared to 32.39±1.59 and 38.5±2.26 days in winter season
for male and female, respectively under laboratory conditions.
Estimated reduction in plant height, number of branches and number of fruits due to
different release levels of T. macfarlanei in brinjal were 10.23 to 18.99, 9.71 to 29.83 and
13.55 to 38.81 per cent, respectively under cage condition with 12.18 to 32.21 per cent
reduction in yield. High K applied plots recorded lowest number of red spider mites whereas
high N harboured more number of mites. Maximum plant height, number of branches and
fruits were recorded in high N + P + K, RDF, high K + N+P and 50% RDF + vermicompost.
Under laboratory conditions, diafenthiuron (0.075%), spiromesifen (0.024%) and
dicofol (0.046%) proved excellent by causing more than 97 per cent egg and adult mortality.
Among botanicals, neem oil (2%) and NSKE (5%) were found effective. Promising
botanicals and synthetic chemicals were further evaluated under field conditions. Among
botanicals, neem oil and NSKE were found promising. Spiromesifen, diafenthiuron and
dicofol were highly effective against all stages of spider mite. Maximum fruit yields were
recorded in spiromesifen and diafenthiuron with 240.74 and 248.97 q per ha during second
and 176.33 and 163.99 q per ha during third season trial, respectively. All the tested synthetic
chemicals were highly detrimental to phytoseiids during second and third field trial while,
botanicals were comparatively safer.
 
Date 2016-07-22T10:32:56Z
2016-07-22T10:32:56Z
2005
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/69177
 
Format application/pdf
 
Publisher UAS Dharwad