STUDIES ON POPULATION DYNAMICS AND MANAGEMENT OF MANGO LEAFHOPPERS
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Date
2000
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University of Agricultural Science, Dharwad
Abstract
"Studies on the population dynamics of mango leafhoppers
conducted at Dharwad revealed the occurrence of three species of
leafhoppers namely Amritodus atkinsoni (Leth.) Idioscopus nitidulus [Leih.]
and Idioscopus clypealis (Leth.) throughout the year. The order of
dominance was A. atkinsoni > I. nitidulus > I. clypealis. A. atkinsoni and I.
nitidulus were the major species comprising 41.02 per cent and 40.18 per
cent, respectively. The population of both A. atkinsoni and I. nitidulus shot
up during November-December and maintained the peak activity upto
March. On the contrary, I. clypealis remained at low density upto
December first fortnight, there onwards increasing trend was seen upto
January, later decline in population was noticed from January second
fortnight. However the population again shot up from February second
fortnight to March second fortnight. Among the three species I. clypealis
had significant positive correlation with maximum temperature (r=0.532).
Population of all the three species as well as total leafhopper numbers
was negatively and significantly correlated to morning, afternoon and
mean relative humidity.
Dead leafhoppers due to incidence of Verticillium lecanii (Zimm.)
Vieges were found attached to plant axils and also on the undersurface of
leaves. The natural incidence varied from zero (2^^^ fortnight of November)
to 5.79 per cent (2""^ fortnight of October). Incidence of V. lecanii and
morning afternoon and mean relative humidity were positively and
significantly correlated. Field collected live leafhoppers carried infection by
the entomopathogens, namely V. lecanii and Beauveria bassiana (Bals.)
Vuill which was indicated by their development in PDA medium in the
laboratory.
Lambda cyhalothrin (0.5 ml/litre) and imidacloprid (0.25 ml/litre)
were the most effective chemicals in reducing the population of the
leafhoppers. Cypermethrin, profenofos, monocrotophos and acephate were
the next to follow, whereas fipronil and endosulfan were the least effective
treatments.
Among the sequential sprays tried, sprays of Verticel followed with
monocrotophos appeared to be promising in terms of reducing the
pesticide load in the environment."
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No. of references 88