Abstract
Themango gall fly (Procontarinia) is a growing concern in many countries that importmango trees.Mangoes flush
(produce opening buds) twice a year: once in spring, and the main flush, which occurs in early autumn flush and corresponds
to the photoperiod necessary for the gall fly to emerge. Gall flies attack only very young mango flush leaves. Three cultivars
displaying varying susceptibility were used in this study: Heidi, which typically is heavily infected; Keitt, which displays
antixenosis properties; and Sensation, which is resistant to gall fly attack. Headspace profiles of the three cultivars were
obtained over two full growing seasons. It was found that flush leaves emit higher levels of volatile organic compounds than
mature leaves. Volatile emissions peaked during the main flush, after which they declined as the tree went into the winter
dormant period. The levels of a- and b-pinene increased in gall fly-susceptible cultivars as the season progressed, while very
low levels of these terpenes were emitted by resistant cultivars. The changes in the profiles of these emissions suggest that aand
b-pinene may be linked to gall fly susceptibility. In addition, chemometric analysis confirmed the correlation between
volatile emissions and gall fly susceptibility.
| Identifer | oai:union.ndltd.org:netd.ac.za/oai:union.ndltd.org:tut/oai:encore.tut.ac.za:d1001216 |
| Date | 15 June 2010 |
| Creators | Augustyn, WA, Maree, JE, du Plooy, GW, Botha, BM, Combrinck, S |
| Publisher | Wiley InterScience |
| Source Sets | South African National ETD Portal |
| Language | English |
| Detected Language | English |
| Type | Text |
| Format | |
| Rights | Copyright © 2010 John Wiley & Sons, Ltd. |
| Relation | Flavour and Fragrance Journal |
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