Biology And Population Dynamics Of Mango Flower Thrips (Thysanoptera) And Effectiveness Of Neem (Azadirachta Indica) Oil For Their Control
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Date
2011-10
Authors
Aliakbarpour, Hamaseh
Journal Title
Journal ISSN
Volume Title
Publisher
Universiti Sains Malaysia
Abstract
Population dynamics of thrips was investigated in treated and untreated mango
orchards, located at Balik Pulau, Penang between 2008 and 2010. Thrips abundance
was estimated by collecting them from mango panicles and various weed species
growing in the orchard. Four thrips species from the family Thripidae; Thrips
hawaiiensis, Scirtothrips dorsalis, Frankliniella schultzei and Megalurothrips
usitatus were recorded from the treated orchard. Other than these species, Thrips
palmi (Thripidae) and Haplothrips sp. (Phlaeothripidae) were encountered in the
untreated orchard. Comparing several thrips collection techniques with the absolute
population count, CO2 collection method was the most efficient procedure, extracting
80.7% adults, followed by the washing procedure (62.3%) and the shaking method
(36.4%). All collection techniques showed that the numbers of all thrips species in
mango panicles reached a daily peak between 1200 and 1400 hrs. Assessment of
diurnal flight activity, which is useful for effective timing of sampling and
controlling of this pest, had shown that adult thrips captured on the yellow sticky
traps were the most abundant between 0800-1000 and 1600-1800 hrs. Sticky trap
was also found to be satisfactorily reliable to monitor thrips populations in mango
orchard. The level of aggregation of thrips adults on mango panicles was
significantly higher in the treated orchard than in the untreated orchard, but the larval
distribution was found to be normal in both orchards. Densities of larval thrips
falling into the soil to pupate were determined using a drop trap. Emerging thrips
adults captured in an emergence trap provided information on generation patterns of
various thrips species in the mango orchards.
Description
Keywords
Population dynamics of mango flower thrips , effectiveness of neem oil for their control