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A new species of gall midge (Diptera: Cecidomyiidae) attacking mango foliage in Guam, with observations on its pest status and biology

Published online by Cambridge University Press:  10 July 2009

K.M. Harris  and
I.H. Schreiner
K.M. Harris*
Affiliation:
International Institute of Entomology, London, SW7 5JR, UK
I.H. Schreiner
Affiliation:
College of Agriculture and Life Sciences, University of Guam, Mangilao, Guam 96923
*
Dr K. M. Harris, International Institute of Entomology, 56 Queen's Gate, London, SW7 5JR, UK.
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Abstract

A new species of gall midge, Procontarinia schreineri Harris, which attacks mango foliage in Guam, is described and the results of field observations on its pest status, biology and population fluctuations are reported. Eggs are laid on young mango leaves and larvae, which develop rapidly over about 5 days, induce blister galls before leaving to pupate. Secondary damage to infested foliage is caused by the fungus Colletotrichum gloeosporioides, which invades damaged leaf tissue and causes mango anthracnose disease. P. schreineri population fluctuations on mangoes were assessed at four localities on Guam over three years by counting the numbers of galls. It was concluded that the main factors affecting populations were rainfall and location. More galls were present during rainy periods, possibly because high humidity improves larval and pupal survival. Gall populations were generally low and unlikely to have direct effects on fruit yields but the introduction of new improved varieties of mango might increase susceptibility to damage. In addition, old galls on damaged leaves may provide reservoirs of anthracnose inoculum.

Type
Research Paper
Information
Bulletin of Entomological Research , Volume 82 , Issue 1 , March 1992 , pp. 41 - 48
Copyright
Copyright © Cambridge University Press 1992

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