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After an outbreak of blotch leafminer ( Cameraria caryaefoliella ) on field-grown pecan ( Carya illinoinensis ) trees in 2010, an experiment was conducted to evaluate the consequences of the injury on carbon assimilation and photosynthetic efficiency, and, in particular, to assess if low-to-moderate injury induces a compensatory increase in photosynthesis. Gas exchange and light-adapted fluorescence were measured on non-injured portions of the leaflet lamina adjacent to the injured area as well as on portions of leaflets that included leafminer injury. Results indicate that damage of the photosynthetic apparatus did not extend beyond the injured areas by leafminers. Furthermore, although a strong relationship between the proportion of leafminer injury and area-based net CO 2  assimilation rate of injured leaflet tissue was found, there was no evidence that pecan leaves were able to compensate for leafminer injury by upregulating CO 2  assimilation in leaflet tissue that was unaffected.

Consequences of Injury Caused by Cameraria caryaefoliella (Lepidoptera: Gracillariidae) on Pecan Gas Exchange and Chlorophyll Fluorescence