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Variation in attack by the mahogany shoot borer, Hypsipyla grandella (Lepidoptera: Pyralidae), in relation to host growth and phenology

Published online by Cambridge University Press:  10 July 2009

A.C. Newton*
Affiliation:
Institute of Terrestrial Ecology (ITE), Bush Estate, Penicuik, Midlothian, EH26 OQB, UK:
J.P. Cornelius*
Affiliation:
Proyecto Mejoramiento Genético Forestal, Centro Agronómico de Investigación y Enseñanza (CATIE), Turrialba 7170, Costa Rica
J.F. Mesén
Affiliation:
Proyecto Mejoramiento Genético Forestal, Centro Agronómico de Investigación y Enseñanza (CATIE), Turrialba 7170, Costa Rica
E.A. Corea
Affiliation:
Proyecto Mejoramiento Genético Forestal, Centro Agronómico de Investigación y Enseñanza (CATIE), Turrialba 7170, Costa Rica
A.D. Watt
Affiliation:
Institute of Terrestrial Ecology (ITE), Bush Estate, Penicuik, Midlothian, EH26 OQB, UK:
*
*The Institute of Ecology and Resource Management, University of Edinburgh, Darwin Building, Mayfield Road, Edinburgh, EH9 3JU, UK. Fax: 0131 662 0478 E-mail: a.newton@ed.ac.uk
**Overseas Development Administration, UK.

Abstract

In order to evaluate the relationships between attacks by the mahogany shoot borer Hypsipyla grandella (Zeller) and host growth and phenology, field trials of Spanish cedar Cedrela odorata and American mahogany Swietenia macrophylla established in Costa Rica were assessed intensively over an 84 week period. Height growth of C. odorata was approximately twice that of S. macrophylla, with mean growth rates of 2.0 and 1.3 cm week−1 respectively. Cedrela odorata displayed pronounced temporal variation in leaf phenology, with a minimum of 51% of trees in leaf during a relatively dry period. In contrast, the minimum proportion of foliated S. macrophylla trees was 87%. No shoot borer attacks were recorded on S. macrophylla until week 50 after the onset of assessments, whereas initial attacks of C. odorata were recorded during week 6. By week 84, the proportion of trees attacked was 74% and 77%, respectively. In both species, attacks were concentrated in seasonal peaks, coinciding with the production of new shoots. Pronounced spatial variation in attack was observed in both species. At week 12, the number of attacks per block in C. odorata was negatively correlated with available calcium concentration (r=0.85, P<0.001), whereas mean height growth of C. odorata was positively correlated with available phosphate concentration (r=0.84; P<0.0001). Significant variation in height to first damaging attack was observed in both species. By the end of the observational period, only 6% of C. odorata and 0.4% S. macrophylla remained undamaged to a height of 3 m. It is suggested that control methods for the mahogany shoot borer should take account of temporal dynamics in attack, and relationship to host phenology. Manipulation of the soil nutrient status may also form part of an integrated approach to pest management.

Type
Review Article
Copyright
Copyright © Cambridge University Press 1998

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