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Population Dynamics of Leafhopper, Amrasca devastans Distant in Cotton and its Relationship with Weather Parameters

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Author(s): S. Selvaraj | D. Adiroubane | V. Ramesh

Journal: Journal of Entomology
ISSN 1812-5670

Volume: 8;
Issue: 5;
Start page: 476;
Date: 2011;
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Keywords: correlation | varieties | pest management | weather factors | Amrasca devastans | Gossypium

ABSTRACT
Amrasca devastans at five different date of sowing on three varieties of cotton. The pest population was started from third week of February on third weeks old crop and acquired its peak in second week of March on six weeks old crop. Maximum pest population (9.30/3 leaves) was build up at temperature ranged from 21 to 31C, relative humidity ranges from 82 and 55 percent, zero rainfall, wind velocity 4.5 km h-1, total sunshine hours (9.00 h week-1), evaporation (56.10 mm) and dewfall (1.491 mm). The highest incidence of leafhopper population was recorded in MCU 7 followed by SPCH 22 and SVPR 3. Leafhopper population was build up showed a significant and positive correlation with morning and evening relative humidity and rainfall whereas, it was significant and negative association with minimum temperature, wind velocity and dewfall. The determination of effects of different weather factors on population of leafhoppers in cotton was essential for effective pest management. This study will be very helpful not only for forecasting the out breaks of leafhopper population but also in formulating effective pest management strategies.]]>
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