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Publication Type
Book Chapter
Author, Analytic
Robinson, Dwight E.; Mansingh, Ajai
Author Affiliation, Ana.
Department of Life Sciences
Title, Analytic
The impact of botanical formulations on the feeding activity, fecundity and fertility of the citrus root weevil, Exophthalmus vittatus Linne
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Author, Monographic
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Title, Monographic
Utilization of natural products in Developing Countries: Trends and needs edited by Ajai Mansingh, Ajai, Donald E Young, Donald E. , Trevor H.Yee, Rupija Delgoda, Dwight E. Robinson,Dwight E., Errol Y. Morrison, Henry I.Lowe.
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Edition
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Place of Publication
Kingston, Jamaica
Publisher Name
The Natural Products Institute, University of the West Indies
Date of Publication
2002
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Issue ID
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Page(s)
247-52
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Abstract
Several species of root weevil (Coleoptera: Curculionidae) belonging to the genera Exophthalmus, Pachnaeus, and Lachnopus have been major pests of citrus in Jamaica since the 1920s inflicting annual losses of about US$ 2.0 million annually by the late 1980s. A history of poor chemical control strategies against the weevil with disastrous ecological and environmental consequences prompted the following study, which examines the potential of formulations of plants in the management of this pest. The impact of the botanical formulations was dtermined by exposing the citrus root weevil, Exophthalmus vittatus, to citrus leaves trested with pure neem oil and its different formulations, under laboratory conditions. Food consumption and its effects on the survival and fecundity of the weevils, and viability of the eggs oviposited by them, were determined over a 20-day period. The corrected mortality of weevils feeding on leaves treated with pure neem oil was 16.5%, and ranged between about 35 and 75% after feeding on leaves treated with other formulations for 9 days. The formulations inhibited feeding by 22-81% during the first three days of exposure under laboratory conditions. In the green house, where the insects had a choice of food, inhibition of feeding ranged from 31% to 100% for the different treatments. The insects exposed to treated leaves produced an average of 11.0 5.8 to 70 13 eggs per female, compared with 100 4.5 eggs in the control. The formulations inhibited embryogenesis by about 20 to 60%. The botanical formulations show promise as a tool in the integrated management of the citrus root weevils.....
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